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Movements, leaders, victories and the continuing fight for equality.
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Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
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In August 1908, a white mob attacked Springfield, Illinois’s Black community, destroying homes and businesses and lynching two Black men. National outrage over the violence helped spur the movement that created the NAACP the following year.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
| Discipline | Neuroscience, Psychology, Vision |
|---|---|
| Language | English |
| Edited by | Dennis M. Levi, OD, PhD |
| Publication details | |
| History | 2001–present |
| Publisher | |
| Frequency | Continuously |
| Yes | |
| License | CC BY or BY-NC-ND |
| 2.0 (2023) | |
| Standard abbreviations | |
| ISO 4 | J. Vis. |
| Indexing | |
| ISSN | 1534-7362 |
| OCLC no. | 46764959 |
| Links | |
Journal of Vision is an open access online scientific journal specializing in the neuroscience and psychology of the visual system. It publishes primary research from any discipline within the visual sciences. Submissions go through pre-publication peer review and are indexed in PubMed.
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Journal of Vision is an open access online scientific journal specializing in the neuroscience and psychology of the visual system. It publishes primary research from any discipline within the visual sciences. Submissions go through pre-publication peer review and are indexed in PubMed.
The International Journal of Computer Vision (IJCV) is a journal published by Springer. The editors-in-chief are Karteek Alahari, Yasuyuki Matsushita, and Svetlana Lazebnik.
Persistence of vision or visual persistence is the optical illusion that occurs when the visual perception of an object continues for some time after the rays of light proceeding from it have ceased to enter the eye. The illusion has also been described as "retinal persistence" when attributed strictly to the retina, and "persistence of impressions" as a more general term that can also apply to the other senses. An example of the phenomenon is the fiery trail from a glowing coal or burning stick that is whirled around in the dark. Some explanations of the illusion describe either positive afterimages or motion smear (comparable to motion blur in photography, film and video). Recent theories about visual sensory memory differentiate between higher-level psychological 'informational persistence' and lower-level phenomenal 'visible persistence'. The human visual system depends on temporal integration in general; it continuously processes visual inputs over time. "Persistence of vision" can be understood to be the same as "flicker fusion", the effect that images persist when the light that enters the eyes is interrupted at short, regular intervals. When the frequency is too high for the visual system to discern differences between moments, light and dark impressions fuse into a continuous image of the scene with intermediate brightness (defined by the Talbot-Plateau law). Since its introduction, the term "persistence of vision" has often been claimed to be the explanation for motion perception in optical toys like the phenakistiscope and the zoetrope, praxinoscope, mutoscope, theatre optique (optical theater) and later in cinema. This theory has been disputed long before cinematography's breakthrough in 1895. The illusion of motion as a result of fast intermittent presentations of sequential images is a stroboscopic effect, as explained in 1833 by Simon Stampfer, one of the inventors of the stroboscopic disc (phenakistiscope). If the retention of images lasts longer than the interruptions, it does explain the apparent continuity of the image, which looks weaker, depending on the ratio between exposures and interruptions. Early descriptions of the illusion attributed the effect purely to the physiology of the eye, particularly the retina. The nervous system later became accepted as an important factor.
Color vision (CV), a feature of visual perception, is an ability to perceive differences between light composed of different frequencies independently of light intensity. Color perception is a part of the larger visual system and is mediated by a complex process between neurons that begins with differential stimulation of different types of photoreceptors by light entering the eye. Those photoreceptors then emit outputs that are propagated through many layers of neurons ultimately leading to higher cognitive functions in the brain. Color vision is found in many animals and is mediated by similar underlying mechanisms with common types of biological molecules and a complex history of the evolution of color vision within different animal taxa. In primates, color vision may have evolved under selective pressure for a variety of visual tasks including the foraging for nutritious young leaves, ripe fruit, and flowers, as well as detecting predator camouflage and emotional states in other primates.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Madam C.J. Walker
