scholarly journals Contrast adaptation effects under interocualr suppression for normal and strabismic observers

2010 ◽  
Vol 2 (7) ◽  
pp. 319-319
Author(s):  
M. Yanagisawa ◽  
K. Uchikawa
Keyword(s):  
Contrast Adaptation ◽  
Adaptation Effects

Spatial Frequency-Specific Contrast Adaptation Originates in the Primary Visual Cortex

2007 ◽  
Vol 98 (1) ◽  
pp. 187-195 ◽  
Author(s):  
Thang Duong ◽  
Ralph D. Freeman
Keyword(s):  
Visual Cortex ◽  
Spatial Frequency ◽  
Frequency Tuning ◽  
Adaptation Effect ◽  
Tuning Curves ◽  
Contrast Adaptation ◽  
Spatial Frequencies ◽  
Neurophysiological Studies ◽  
High Contrast Grating ◽  
Adaptation Effects

Adaptation to a high-contrast grating stimulus causes reduced sensitivity to subsequent presentation of a visual stimulus with similar spatial characteristics. This behavioral finding has been attributed by neurophysiological studies to processes within the visual cortex. However, some evidence indicates that contrast adaptation phenomena are also found in early visual pathways. Adaptation effects have been reported in retina and lateral geniculation nucleus (LGN). It is possible that these early pathways could be the physiological origin of the cortical adaptation effect. To study this, we recorded from single neurons in the cat's LGN. We find that contrast adaptation in the LGN, unlike that in the visual cortex, is not spatial frequency specific, i.e., adaptation effects apply to a broad range of spatial frequencies. In addition, aside from the amplitude attenuation, the shape of spatial frequency tuning curves of LGN cells is not affected by contrast adaptation. Again, these findings are unlike those found for cells in the visual cortex. Together, these results demonstrate that pattern specific contrast adaptation is a cortical process.

Modeling Visual Cortical Contrast Adaptation Effects

1997 ◽  
pp. 525-531 ◽  
Author(s):  
E. V. Todorov ◽  
A. G. Siapas ◽  
D. C. Somers ◽  
S. B. Nelson
Keyword(s):  
Contrast Adaptation ◽  
Visual Cortical ◽  
Adaptation Effects

Contrast adaptation may enhance contrast discrimination

2002 ◽  
Vol 16 (1) ◽  
pp. 45-58 ◽  
Author(s):  
Giulia Abbonizio ◽  
Colin Clifford ◽  
Keith Langley
Keyword(s):  
Contrast Adaptation ◽  
Contrast Discrimination
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