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  • 1
    Publication Date: 1979-12-14
    Description: After viewing a suitable grating of vertical stripes for 5 minutes, subjects overestimated the width of a rectangle by 6 percent. The shifts in perception of size occurred whether individual stripes in the grating were narrower than, equal to, or wider than the rectangle. Rectangle width was underestimated only if the grating stripes were extremely wide, with a spatial frequency lower than most of the effective amplitude spectrum of the rectangle. These findings (and complementary ones with horizontal gratings) suggest that the visual system codes size on the basis of spatial frequency components, rather than directly in terms of width.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Frome, F S -- Levinson, J Z -- Danielson, J T -- Clavadetscher, J E -- New York, N.Y. -- Science. 1979 Dec 14;206(4424):1327-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/515736" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Physiological ; Humans ; Size Perception/*physiology ; Visual Fields ; Visual Perception/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1982-04-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stork, D G -- Levinson, J Z -- New York, N.Y. -- Science. 1982 Apr 9;216(4542):204-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7063883" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Visual Cortex/physiology ; Visual Fields ; Visual Perception/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1979-12-21
    Description: Adaptation to a grating of properly chosen frequency may lead to two apparently conflicting observations: Another grating may then appear to be of increased frequency (compared with its "unadapted" frequency) while the individual bars of the grating appear to have widened. This perceived widening parallels previous results with single bars. By attending to only one grating bar, the subject effectively seems to change the grating frequency spectrum to that of a single bar.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levinson, J Z -- Frome, F S -- New York, N.Y. -- Science. 1979 Dec 21;206(4425):1425-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/505017" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Humans ; Size Perception/*physiology ; Visual Fields ; Visual Perception/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 1980-11-28
    Description: At night efferent optic nerve activity generated by a circadian clock in the Limulus brain changes the structure of the photoreceptor and surrounding pigment cells in the animal's lateral eyes. The structural changes allow each ommatidium to gather light from a wider area at night than during the day. Visual sensitivity is thereby increased, but spatial resolution is diminished. At daybreak efferent activity from the clock stops, the structural changes reverse, and the field of view of each ommatidium decreases. The cyclic changes are endogenous and continue in the dark. Thus, under the control of a circadian clock, the Limulus eye exchanges its daytime acuity for greater sensitivity at night.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barlow, R B Jr -- Chamberlain, S C -- Levinson, J Z -- EY-00667/EY/NEI NIH HHS/ -- EY-01640/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1980 Nov 28;210(4473):1037-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7434015" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Afferent Pathways ; Animals ; Brain/physiology ; Circadian Rhythm ; Efferent Pathways ; Eye/anatomy & histology ; Horseshoe Crabs/*physiology ; Ocular Physiological Phenomena ; Optic Nerve/physiology ; Photoreceptor Cells/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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