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If a viewer stares at the white dot in the center of this image for 5–60 seconds and then looks at a plain white surface, a negative afterimage will appear, showing a person's face in a more natural color scheme. This can also be achieved by the viewer closing their eyes.

An afterimage, or after-image, is an image that continues to appear in the eyes after a period of exposure to the original image. An afterimage may be a normal phenomenon (physiological afterimage) or may be pathological (palinopsia). Illusory palinopsia may be a pathological exaggeration of physiological afterimages. Afterimages occur because photochemical activity in the retina continues even when the eyes are no longer experiencing the original stimulus.[1][2]

The remainder of this article refers to physiological afterimages. A common physiological afterimage is the dim area that seems to float before one's eyes after briefly looking into a light source, such as a camera flash. Palinopsia is a common symptom of visual snow.

Negative afterimages

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Negative afterimages are generated in the retina but may be modified like other retinal signals by neural adaptation of the retinal ganglion cells that carry signals from the retina of the eye to the rest of the brain.[3]

Normally, any image is moved over the retina by small eye movements known as microsaccades before much adaptation can occur. However, if the image is very intense and brief, or if the image is large, or if the eye remains very steady, these small movements cannot keep the image on unadapted parts of the retina.

Afterimages can be seen when moving from a bright environment to a dim one, like walking indoors on a bright snowy day. They are accompanied by neural adaptation in the occipital lobe of the brain that function similar to color balance adjustments in photography. These adaptations attempt to keep vision consistent in dynamic lighting. Viewing a uniform background while adaptation is still occurring will allow an individual to see the afterimage because localized areas of vision are still being processed by the brain using adaptations that are no longer needed.

The Young-Helmholtz trichromatic theory of color vision postulated that there were three types of photoreceptors in the eye, each sensitive to a particular range of visible light: short-wavelength cones, medium-wavelength cones, and long-wavelength cones. Trichromatic theory, however, cannot explain all afterimage phenomena. Specifically, afterimages are the complementary hue of the adapting stimulus, and trichromatic theory fails to account for this fact.[4]

The failure of trichromatic theory to account for afterimages indicates the need for an opponent-process theory such as that articulated by Ewald Hering (1878) and further developed by Hurvich and Jameson (1957).[4] The opponent process theory states that the human visual system interprets color information by processing signals from cones and rods in an antagonistic manner. The opponent color theory is that there are four opponent channels: red versus cyan, green vs magenta, blue versus yellow, and black versus white. Responses to one color of an opponent channel are antagonistic to those of the other color. Therefore, a green image will produce a magenta afterimage. The green color adapts the green channel, so they produce a weaker signal. Anything resulting in less green is interpreted as its paired primary color, which is magenta (an equal mixture of red and blue).[4]

Positive afterimages

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Positive afterimages, by contrast, appear the same color as the original image. They are often very brief, lasting less than half a second. The cause of positive afterimages is not well known, but possibly reflects persisting activity in the brain when the retinal photoreceptor cells continue to send neural impulses to the occipital lobe.[5]

A stimulus which elicits a positive image will usually trigger a negative afterimage quickly via the adaptation process. To experience this phenomenon, one can look at a bright source of light and then look away to a dark area, such as by closing the eyes. At first one should see a fading positive afterimage, likely followed by a negative afterimage that may last for much longer. It is also possible to see afterimages of random objects that are not bright, only these last for a split second and go unnoticed by most people.[citation needed]

On empty shape

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An afterimage in general is an optical illusion that refers to an image continuing to appear after exposure to the original image has ceased. Prolonged viewing of the colored patch induces an afterimage of the complementary color (for example, yellow color induces a bluish afterimage). The "afterimage on empty shape" effect is related to a class of effects referred to as contrast effects.[citation needed]

In this effect, an empty (white) shape is presented on a colored background for several seconds. When the background color disappears (becomes white), an illusionary color similar to the original background is perceived within the shape.[citation needed] The mechanism of the effect is still unclear, and may be produced by one or two of the following mechanisms:

  • During the presentation of the empty shape on a colored background, the colored background induces an illusory complementary color ("induced color") inside the empty shape. After the disappearance of the colored background an afterimage of the "induced color" might appear inside the "empty shape". Thus, the expected color of the shape will be complementary to the "induced color", and therefore similar to the color of the original background.
  • After the disappearance of the colored background, an afterimage of the background is induced. This induced color has a complementary color to that of the original background. It is possible that this background afterimage induces simultaneous contrast on the "empty shape". Simultaneous contrast is a psychophysical phenomenon of the change in the appearance of a color (or an achromatic stimulus) caused by the presence of a surrounding average color (or luminance).
[edit]
  • The U.S. flag inverted: if a viewer stares at the middle stripe for around 25 to 30 seconds, then looks at a wall and blink rapidly, this image will appear in color.
    The U.S. flag inverted: if a viewer stares at the middle stripe for around 25 to 30 seconds, then looks at a wall and blink rapidly, this image will appear in color.
  • The Italian flag inverted: if a viewer stares at the middle of the flag long enough and blinks at a wall rapidly afterwards, this flag will appear in color.
    The Italian flag inverted: if a viewer stares at the middle of the flag long enough and blinks at a wall rapidly afterwards, this flag will appear in color.
  • Example video which produces a distorted illusion after one watches it and looks away. See motion aftereffect.

See also

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Notes

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Afterimage

View on Grokipedia
from Grokipedia
An is a visual in which an continues to appear in one's field of vision after exposure to the original stimulus has ended, typically lasting from seconds to minutes. This arises from the adaptation or overstimulation of the eye's photoreceptor cells, such as and cones in the , leading to a temporary imbalance in neural signaling. Afterimages are classified into two primary types: positive and negative. Positive afterimages maintain the same colors and as the original stimulus and are often generated through cortical processes in the rather than solely retinal mechanisms. In contrast, negative afterimages feature and inverted lightness levels to the original, resulting from the fatigue of photoreceptors after prolonged viewing of a bright or high-contrast image. These retinal-based effects do not transfer between eyes, confirming their origin at the level of the . The physiological basis of afterimages involves the chemical changes in photopigments like , which becomes bleached by intense light and requires time to regenerate, causing the persistent perception. While typically benign and a normal aspect of human vision, unusually prolonged or frequent afterimages can signal underlying conditions such as , often linked to neurological disruptions in visual processing areas of the . Research continues to explore the interplay between retinal and cortical contributions to these illusions, highlighting their role in understanding .

Overview and History

Definition and Characteristics

An is a visual illusion in which a representation of an original stimulus persists or a complementary image emerges in the after the stimulus itself has ceased, resulting from the or overstimulation of cells. This occurs universally in healthy human vision as a normal response to intense or prolonged visual input, but prolonged afterimages lasting beyond typical durations may signal underlying medical conditions such as . Key characteristics of afterimages include their transient nature, typically enduring from a few seconds to several minutes depending on the stimulus intensity and exposure duration, and their tendency to manifest most clearly against a uniform or blank background, such as a white wall. In negative afterimages, which are the most common form, colors appear inverted or complementary to the original stimulus due to selective in the photoreceptors. For instance, staring at a bright source may produce a lingering dark spot, while fixating on a colored flag, such as the American flag, can yield an afterimage with inverted hues—red becoming , blue turning yellow, and so on—upon shifting gaze to a neutral surface. At its core, the process involves fatigue of retinal photoreceptors, including cones sensitive to specific wavelengths and for low-light detection, which disrupts the balance in the visual system's opponent color channels—red-green, blue-yellow, and black-white—leading to the illusory perception. This adaptation reflects the retina's mechanism for normalizing visual input, though higher neural processes may contribute to the conscious experience of the illusion.

Historical Development

The phenomenon of afterimages dates back to ancient observations of visual persistence. , in his Parva Naturalia, provided the earliest recorded descriptions of afterimages, noting their occurrence after prolonged fixation on bright stimuli and linking them to the persistence of visual sensations beyond the removal of the exciting cause. These accounts laid foundational groundwork for understanding afterimages as a form of visual illusion arising from sensory adaptation. In the early 18th century, Newton's Opticks (1704) advanced this by documenting color afterimages in optical experiments, observing that spectral colors produced lingering impressions on the after the prism or light source was withdrawn, contributing to early insights into chromatic persistence. The 19th century marked significant experimental progress in dissecting afterimage mechanisms. Jan Evangelista Purkinje's 1825 dissertation detailed subjective visual phenomena, including the —where color perceptions shift toward blue-green in low light—and extensive observations of afterimage color changes and durations under varying conditions. Building on this, Hermann von Helmholtz's Handbook of Physiological Optics (1867) formalized adaptation theory, positing that afterimages result from temporary fatigue or exhaustion of elements sensitive to specific colors or intensities, providing a physiological framework for their negative appearance. Early 20th-century developments integrated afterimages into broader perceptual theories. Ewald Hering's , introduced in 1878 and expanded through physiological studies in the 1960s, explained afterimages as imbalances in antagonistic color channels (red-green, blue-yellow, black-white), accounting for their complementary hues without delving into neural details here. In the 1920s and 1930s, Gestalt psychologists such as and incorporated afterimages into discussions of holistic perception, emphasizing the brain's active structuring of visual experience over elemental sensations. Mid-century psychophysical experiments, including those measuring afterimage latency and duration in monocular and binocular conditions (e.g., 1951 studies), quantified variability in persistence times, often ranging from seconds to minutes depending on stimulus intensity. Later milestones included technological advancements in the 1960s, when psychophysics laboratories first used photographic techniques to induce and document controlled afterimages, enabling precise replication of negative patterns without direct observer fixation. By the post-2000 era, functional magnetic resonance imaging (fMRI) studies confirmed cortical substrates, revealing retinotopic activation in primary visual cortex (V1) that tracks perceived rather than retinal afterimage size, alongside color processing in area V4. Recent research as of 2025 has further elucidated the neural mechanisms, showing that afterimages involve distributed brain processes beyond retinal adaptation, including non-opponent color representations and correlations with visual imagery vividness. These neuroimaging efforts shifted focus from purely retinal explanations toward distributed neural dynamics.

Physiological Mechanisms

Neural and Retinal Processes

At the retinal level, afterimages emerge from the of photoreceptor cells, where prolonged exposure to a visual stimulus causes selective in types. For instance, overstimulation of long-wavelength-sensitive (L-) by diminishes their signaling, leading to a compensatory green afterimage from relatively heightened medium-wavelength-sensitive (M-) activity when viewing a neutral field. In low-light environments, rod photoreceptors contribute similarly through temporary saturation; a brief intense flash can saturate , rendering subsequent stimuli invisible until the afterimage decays and sensitivity recovers. This adaptation aligns with the , formulated by Ewald Hering in 1878, which describes via three paired antagonistic mechanisms: red versus green, blue versus yellow, and black versus white. Fatigue in one channel's pole during stimulation inhibits its opponent, producing a upon offset that manifests as a complementary afterimage, such as a from cone imbalance. Adapted retinal signals pass through the (LGN), where parvocellular pathways relay imbalanced opponent signals with adaptation time constants of approximately 17–21 seconds, sustaining the afterimage's neural representation. Cortical involvement begins in the primary visual cortex (V1), where deep layers process persistent edge and contour information via feedback mechanisms, followed by area V4 for chromatic processing; in V1, prolonged activity peaks 7–11 seconds after stimulus removal. As of 2025, research has identified layer-specific mechanisms in V1 and suggested that color afterimages may not strictly follow opponent-process predictions. Afterimage duration diminishes through neural recovery, modeled as an exponential decay: I(t)=I0e−t/τI(t) = I_0 e^{-t/\tau}, where I(t)I(t) is intensity at time tt, I0I_0 is initial intensity, and τ≈10\tau \approx 10–$30$ seconds reflects cone recovery timescales in parvocellular circuits.

Influencing Factors

The properties of the inducing stimulus significantly influence the occurrence, intensity, and duration of afterimages. Brighter stimuli generally produce stronger and longer-lasting afterimages due to greater photopigment bleaching in the retina. Higher contrast between the stimulus and its background enhances afterimage vividness, as it amplifies the differential adaptation of opponent color channels. The duration of exposure plays a key role, with afterimage strength increasing with adaptation time up to an optimal range of approximately 10-30 seconds, beyond which diminishing returns or saturation may occur; for instance, exposures of 20-30 seconds are commonly used in experiments to reliably induce measurable afterimages. Larger stimulus fields tend to produce afterimages with greater spatial spread, as they engage more retinal area and lead to broader adaptation effects. Environmental factors also modulate afterimages, often by altering the state of retinal . Dark adaptation, achieved through prior exposure to low ambient lighting, prolongs afterimage duration by increasing retinal sensitivity and slowing recovery from photopigment bleaching. Eye movements during or after adaptation can stabilize or distort afterimage perception; for example, saccades may cause trailing effects or fragmentation, while steady fixation preserves clarity. Blinks, conversely, can slightly extend afterimage visibility under certain lighting conditions by interrupting adaptation recovery. Individual differences contribute to variability in afterimage characteristics, reflecting physiological and health-related factors. Age affects persistence, with older adults exhibiting longer afterimage durations compared to younger individuals, possibly due to slower neural recovery processes despite age-related photoreceptor decline. Certain pharmacological agents, such as antidepressants like , can prolong afterimages by inducing , a condition of enhanced visual perseveration. Pathological conditions like increase susceptibility to afterimages, often manifesting as with heightened sensitivity to visual stimuli and impaired . In experimental contexts, variables like specificity allow targeted investigation of mechanisms, as shorter wavelengths (e.g., blue light around 455 nm) induce faster cone fatigue in short-wavelength-sensitive mechanisms, leading to quicker onset but potentially shorter duration compared to longer wavelengths. Measurement techniques, such as perimetry, quantify size and extent by mapping perceived boundaries against a uniform field, providing objective metrics for clinical and research applications. These factors interact with underlying processes to shape phenomenology.

Types of Afterimages

Negative Afterimages

Negative afterimages occur when the perceives or inverted brightness levels following the removal of a stimulus, such as a pattern yielding a or green afterimage and bright areas appearing dark. This inversion arises from the or adaptation of specific photoreceptors, leading to a temporary imbalance where the overstimulated channels become less responsive, causing the opposite response to dominate. For instance, prolonged fixation on a bright region results in a dark afterimage due to the reversal in processing. The mechanism involves a strong imbalance in cone-opponent processes, where the three types of cone cells (sensitive to long-, medium-, and short-wavelength light) adapt unevenly, aligning with the of that posits antagonistic pairs like red-green and blue-yellow. A classic demonstration is staring at the American flag for about 30-60 seconds, after which viewing a white surface produces an afterimage with stripes, a field, and stars and stripes, reflecting the of the original red, blue, and white elements. This effect highlights how adaptation in the L-M (red-green) and S-(L+M) (blue-yellow) opponent channels inverts the perceived hues. These afterimages peak in intensity immediately after stimulus offset and are best observed against a mid-gray background, which minimizes interference from surrounding luminance and enhances contrast. They typically last 5-30 seconds, fading as the photoreceptors recover sensitivity, though duration can vary with adaptation strength and individual factors. Historically, Johann Wolfgang von Goethe explored negative afterimages in his 1810 Theory of Colours, using color wheel experiments to demonstrate physiological color oppositions, such as the emergence of complementary hues after fixating on saturated colors.

Positive Afterimages

Positive afterimages are visual sensations that persist briefly after the removal of a stimulating source, retaining the same hue, polarity, and general as the original stimulus, though they appear fainter and less saturated. For instance, fixating on a source may produce a lingering red spot in the upon gaze shift. These afterimages arise from retinal persistence following , such as the partial recovery of fatigued photoreceptor cells (cones and ), but are often modified by cortical processes in the , which can contribute to their generation, particularly for global or filled-in types. Rod-cone interactions also contribute, particularly in mesopic (low-) conditions where recover more slowly than cones, prolonging the perception after bright exposure. They commonly occur when transitioning from a bright stimulus to a darker environment, such as the lingering image from a beam or the glow of a lit viewed in near-darkness. The duration of positive afterimages is typically brief, often less than a second, but can extend to a few seconds depending on factors like stimulus , exposure time, and ambient lighting, with higher intensity leading to longer persistence. Observation is enhanced by slowly moving the eyes or , which can briefly revive the by shifting retinal adaptation. In rare variants, such as those involving Troxler fading in , prolonged fixation on a stabilized stimulus can lead to fading followed by positive-like persistence upon , due to in retinal ganglion cells. Influencing factors like ambient lighting can modulate intensity, with darker surrounds prolonging visibility.

Afterimages on Empty Backgrounds

When projected onto an empty or uniform background, such as a blank or gray field, afterimages often appear to float detached from any surface or expand beyond their original dimensions due to the absence of spatial anchors and contextual cues. This lack of surrounding features deprives the of reference points, leading to a heightened of illusoriness and increased vividness as the interprets the persistent retinal signal without integration into a structured scene. The perceptual effects on empty backgrounds include apparent spontaneous movement or growth of , as the absence of stabilizing elements allows minor eye movements or neural processes to distort its perceived stability and scale. For instance, after fixating on a spinning Benham's top—a black-and-white disk that induces illusory colors through temporal modulation—these colors can persist as dynamic, moving afterimages when viewed against a blank field, enhancing the sense of motion without external stimuli. These effects are mechanistically nuanced by interactions with the Troxler effect, where prolonged fixation on a uniform field causes peripheral fading that can reverse, momentarily amplifying the afterimage's salience and preventing its dissipation. Studies demonstrate that afterimages projected onto empty fields are perceived as larger than on textured backgrounds, attributable to the visual system's size-distance scaling, which interprets the unconstrained projection as occurring at greater depth. In psychophysical research, afterimages on empty backgrounds have been employed since Joseph Plateau's 1830s experiments on the persistence of visual impressions, which quantified retention durations to explore motion illusions. Contemporary investigations utilize simulations to isolate these effects, presenting controlled uniform fields that enable precise measurement of dynamics without environmental interference.

In Vision Testing and Science

Afterimages serve as valuable tools in diagnostic applications for assessing visual function. In screening for , negative afterimages have been employed to differentiate between color-weak and fully individuals by measuring differences in their duration and intensity, providing a more reliable classification than traditional tests like Ishihara plates. This approach leverages the of , where inverted afterimages reveal anomalies in color adaptation. In vision research, afterimages are used to quantify and visual processing depth in laboratory settings. For instance, studies in the have shown that afterimage duration correlates with the processing of invisible stimuli, enabling researchers to measure visual responses without relying on conscious . Additionally, afterimage duration has been linked to temporary impairments in , such as recovery times following exposure, where acuity returns within 30 to 60 seconds under dark conditions, aiding in the evaluation of photic effects. Clinically, prolonged afterimages manifest in conditions like , particularly as part of , where individuals with with experience significantly longer afterimage durations—averaging 12.6 seconds compared to 5.5 seconds in healthy controls—indicating potential subcortical or cortical hypersensitivity. In syndrome, afterimages or affect approximately 10% of cases, appearing as persistent echoes of recent visuals superimposed on the environment, distinct from typical CBS hallucinations. Therapeutically, afterimage transfer methods have been applied in for , particularly in cases with eccentric fixation, improving fixation and acuity in children through targeted afterimage exercises. Recent advancements include computational models to analyze afterimage characteristics and dynamics. These tools, influenced by factors like stimulus intensity, support precise quantification in both research and clinical contexts.

In Art, Culture, and Technology

In the realm of visual arts, afterimages play a central role in , a movement that gained prominence in the through the use of geometric patterns to manipulate perception. British artist exemplifies this approach in works like Current (1964), where high-contrast black-and-white stripes create illusory vibrations and persistent afterimages that evoke motion upon prolonged viewing. These effects arise from the retina's response to intense visual stimuli, transforming static canvases into dynamic experiences that challenge viewers' sensory boundaries. Filmmakers have similarly harnessed afterimages and related to enhance narrative flow and emotional impact. Fade-out and dissolve transitions, common since the early , rely on the retina's retention of an for approximately 1/25th of a second, allowing one scene to blend into the next without abrupt discontinuity. This technique, integral to montage , exploits afterimage formation to simulate seamless continuity, as seen in classic films where bright exposures give way to darker frames, leaving ghostly imprints. Culturally, afterimages symbolize lingering impressions in various media, including light-based festivals that foster shared perceptual phenomena. Installations at events like the festival employ synchronized LED projections, enhancing communal immersion. In contemporary LED art post-2010, artists like calibrate installations such as Your Rainbow Panorama (2011) to provoke deliberate afterimages through saturated, directional lighting, blurring the line between object and viewer perception. Technological innovations in AR and VR often address afterimage artifacts to improve user comfort. Pulse-width modulation (PWM) in displays, used for brightness control, can induce flicker-related afterimages, prompting designs that mitigate these via higher frequencies or DC dimming in headsets like those from Meta and Apple. In video games, developers incorporate afterimage effects for immersive illusions, as in titles like Returnal (2021, with updates into 2022), where adaptive lighting and particle systems create trailing visual echoes to heighten tension during fast-paced action. Music visualizers extend this into , syncing pulsating lights and colors to audio waveforms to evoke afterimage-like persistence. Tools like software generate real-time animations that pulse with bass frequencies, inducing residual color overlays in viewers' vision, often used in live performances to amplify sensory .

References

  1. https://www.exploratorium.edu/snacks/afterimage
  2. https://www.ceenta.com/news-blog/why-do-i-see-afterimages
  3. https://www.science.org/content/article/illusions-wont-go-away
  4. https://www.illusionsindex.org/i/negative-afterimages
  5. https://www.healthline.com/health/neurological-health/palinopsia
  6. https://www.caltech.edu/about/news/new-research-shows-brain-involvedin-visual-afterimages-512
  7. https://pmc.ncbi.nlm.nih.gov/articles/PMC10760211/
  8. https://www.sciencedirect.com/topics/medicine-and-dentistry/afterimage
  9. https://www.animations.physics.unsw.edu.au/jw/light/complementary-colours.htm
  10. https://www.verywellmind.com/what-is-the-opponent-process-theory-of-color-vision-2795830
  11. https://www.sciencedirect.com/science/article/pii/S0042698905004529
  12. https://pmc.ncbi.nlm.nih.gov/articles/PMC12424661/
  13. https://doi.apa.org/doi/10.1037/0033-2909.85.2.338
  14. https://www.gutenberg.org/files/33504/33504-h/33504-h.htm
  15. https://neuroportraits.uk/portrait/jan-evangelista-purkinje.html
  16. https://pmc.ncbi.nlm.nih.gov/articles/PMC5423953/
  17. https://app.jove.com/v/10194/studying-color-perception-using-color-afterimages-visual-illusion
  18. https://archive.org/details/in.ernet.dli.2015.7888
  19. https://psycnet.apa.org/record/1952-06015-001
  20. https://sites.socsci.uci.edu/~whipl/staff/sperling/PDFs/Sperling_NegAI_woPosImage_Sci_1960.pdf
  21. https://www.researchgate.net/publication/221692563_Retinotopic_activity_in_V1_reflects_the_perceived_and_not_the_retinal_size_of_an_afterimage
  22. https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2017.00229/full
  23. https://www.nature.com/articles/s44271-025-00331-5
  24. https://pubmed.ncbi.nlm.nih.gov/40950007/
  25. https://academic.oup.com/nc/article/2024/1/niae032/7725881
  26. https://faculty.washington.edu/chudler/eyecol.html
  27. https://persci.mit.edu/pub_pdfs/afterimage82.pdf
  28. https://pmc.ncbi.nlm.nih.gov/articles/PMC2819806/
  29. https://www.biorxiv.org/content/10.1101/2025.08.30.673266v1
  30. https://www.biorxiv.org/content/10.1101/2023.12.07.570716v1.full-text
  31. https://www.sciencebuddies.org/science-fair-projects/project-ideas/HumBio_p021/human-biology-health/eyes-playing-tricks-afterimages
  32. https://pmc.ncbi.nlm.nih.gov/articles/PMC8445057/
  33. https://jov.arvojournals.org/article.aspx?articleid=2524156
  34. https://jov.arvojournals.org/article.aspx?articleid=2278660
  35. https://pubmed.ncbi.nlm.nih.gov/913469/
  36. https://pubmed.ncbi.nlm.nih.gov/2310343/
  37. https://journals.sagepub.com/doi/10.1177/0333102415625610
  38. https://www.researchgate.net/publication/252159196_Determination_of_the_time_dependence_of_colored_afterimages_-_art_no_68441N
  39. https://www.sciencedirect.com/science/article/pii/S0022510X1200007X
  40. https://www.cns.nyu.edu/~david/courses/perception/lecturenotes/color/color.html
  41. https://pmc.ncbi.nlm.nih.gov/articles/PMC5253736/
  42. https://faculty.washington.edu/chudler/afterflag.html
  43. https://www.nature.com/articles/srep41101
  44. https://www.cambridge.org/core/books/goethe-in-context/colour-theory/244F17BD0164D6749DC49ACCE48D987E
  45. https://www.mdpi.com/1996-1073/14/5/1404
  46. https://doi.org/10.3390/en14051404
  47. https://pmc.ncbi.nlm.nih.gov/articles/PMC12066382/
  48. https://sapienlabs.org/adaptive-mechanisms-and-afterimages/
  49. https://jov.arvojournals.org/article.aspx?articleid=2121204
  50. https://michaelbach.de/ot/col-Benham2/
  51. https://www.biorxiv.org/content/10.1101/383893v1.full-text
  52. https://direct.mit.edu/jocn/article/31/9/1368/29049/Reduced-Fading-of-Visual-Afterimages-after
  53. https://monoskop.org/images/3/39/Foster_Hal_ed_Vision_and_Visuality.pdf
  54. https://www.mdpi.com/2504-2289/6/3/97
  55. https://psycnet.apa.org/record/1944-03410-001
  56. https://pmc.ncbi.nlm.nih.gov/articles/PMC10399604/
  57. https://headachejournal.onlinelibrary.wiley.com/doi/10.1111/head.14934
  58. https://www.charlesbonnetsyndrome.org/index.php?view=article&id=135:afterimages-a-lesser-known-aspect-of-cbs&catid=12
  59. https://pubmed.ncbi.nlm.nih.gov/4500614
  60. https://www.researchgate.net/publication/297950558_Effect_of_afterimage_therapy_in_treatment_children%27s_eccentric_fixation_amblyopia
  61. https://artuk.org/learn/learning-resources/bridget-riley-and-op-art
  62. https://www.webexhibits.org/colorart/riley.html
  63. https://www.zenmuseum.com/finder/page/ultimate-guide-to-bridget-riley-op-art-master-illusion
  64. https://www.masterclass.com/articles/persistence-of-vision-explained
  65. https://garagefarm.net/blog/persistence-of-vision-explained-what-is-persistence-of-vision
  66. https://www.studiobinder.com/blog/what-is-persistence-of-vision-definition/
  67. https://www.thecollector.com/olafur-eliasson-colorful-installations/
  68. https://www.optica-opn.org/home/articles/volume_33/july_august_2022/features/optics_art/
  69. https://ui.adsabs.harvard.edu/abs/2024SPIE13104E..5KL/abstract
  70. https://www.reddit.com/r/gamedesign/comments/rxatsd/illusions_in_game_design/
  71. https://synesthesia.live/
  72. https://pmc.ncbi.nlm.nih.gov/articles/PMC10602345/
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