scholarly journals "Buffy contrast adaptation" with a single Gabor patch

2010 ◽  
Vol 10 (7) ◽  
pp. 1386-1386 ◽  
Author(s):  
N. Graham ◽  
S. S. Wolfson ◽  
I. Kwok ◽  
B. Grinshpun
Keyword(s):  
Gabor Patch ◽  
Contrast Adaptation

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

Contrast adaptation and contrast gain control

1991 ◽  
Vol 87 (1) ◽  
Author(s):  
L.M. M��tt�nen ◽  
J.J. Koenderink
Keyword(s):  
Gain Control ◽  
Contrast Gain ◽  
Contrast Gain Control ◽  
Contrast Adaptation

Contrast Adaptation in a Nonadapting LGN Model

2007 ◽  
Vol 98 (3) ◽  
pp. 1287-1296 ◽  
Author(s):  
Kate S. Gaudry ◽  
Pamela Reinagel
Keyword(s):  
Information Transmission ◽  
Detailed Comparison ◽  
Spike Timing ◽  
Physiological Data ◽  
Model Parameters ◽  
Transient Effects ◽  
Full Field ◽  
Contrast Gain ◽  
Contrast Adaptation ◽  
Contrast Normalization

Sensory neurons appear to adapt their gain to match the variance of signals along the dimension they encode, a property we shall call “contrast normalization.” Contrast normalization has been the subject of extensive physiological and theoretical study. We previously found that neurons in the lateral geniculate nucleus (LGN) exhibit contrast normalization in their responses to full-field flickering white-noise stimuli, and that neurons with the strongest contrast normalization best preserved information transmission across a range of contrasts. We have also shown that both of these properties could be reproduced by nonadapting model cells. Here we present a detailed comparison of this nonadapting model to physiological data from the LGN. First, the model cells recapitulated other contrast dependencies of LGN responses: decreasing stimulus contrast resulted in an increase in spike-timing jitter and spike-number variability. Second, we find that the extent of contrast normalization in this model depends on model parameters related to refractoriness and to noise. Third, we show that the model cells exhibit rapid, transient changes in firing rate just after changes in contrast, and that this is sufficient to produce the transient changes in information transmission that have been reported in other neurons. It is known that intrinsic properties of neurons change during contrast adaptation. Nevertheless the model demonstrates that the spiking nonlinearity of neurons can produce many of the temporal aspects of contrast gain control, including normalization to input variance and transient effects of contrast change.

scholarly journals An unusual kind of contrast adaptation: Shifting a contrast comparison level

2007 ◽  
Vol 7 (8) ◽  
pp. 12 ◽  
Author(s):  
S. Sabina Wolfson ◽  
Norma Graham
Keyword(s):  
Contrast Adaptation ◽  
Comparison Level

scholarly journals Voxel-Wise Linearity Analysis of Increments and Decrements in BOLD Responses in Human Visual Cortex Using a Contrast Adaptation Paradigm

2021 ◽  
Vol 15 ◽  
Author(s):  
Yun Lin ◽  
Xi Zhou ◽  
Yuji Naya ◽  
Justin L. Gardner ◽  
Pei Sun
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Bold Signal ◽  
Transient Responses ◽  
Bold Fmri ◽  
Human Visual Cortex ◽  
Contrast Adaptation ◽  
Bold Responses

The linearity of BOLD responses is a fundamental presumption in most analysis procedures for BOLD fMRI studies. Previous studies have examined the linearity of BOLD signal increments, but less is known about the linearity of BOLD signal decrements. The present study assessed the linearity of both BOLD signal increments and decrements in the human primary visual cortex using a contrast adaptation paradigm. Results showed that both BOLD signal increments and decrements kept linearity to long stimuli (e.g., 3 s, 6 s), yet, deviated from linearity to transient stimuli (e.g., 1 s). Furthermore, a voxel-wise analysis showed that the deviation patterns were different for BOLD signal increments and decrements: while the BOLD signal increments demonstrated a consistent overestimation pattern, the patterns for BOLD signal decrements varied from overestimation to underestimation. Our results suggested that corrections to deviations from linearity of transient responses should consider the different effects of BOLD signal increments and decrements.

scholarly journals Stimulus relevance modulates contrast adaptation in visual cortex

eLife ◽  
2017 ◽  
Vol 6 ◽  
Author(s):  
Andreas J Keller ◽  
Rachael Houlton ◽  
Björn M Kampa ◽  
Nicholas A Lesica ◽  
Thomas D Mrsic-Flogel ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Sensory Processing ◽  
Single Cells ◽  
Dynamic Control ◽  
Task Demand ◽  
Visually Guided ◽  
Contrast Adaptation ◽  
Cortical Adaptation ◽  
Sensory Evoked ◽  
Over Time

A general principle of sensory processing is that neurons adapt to sustained stimuli by reducing their response over time. Most of our knowledge on adaptation in single cells is based on experiments in anesthetized animals. How responses adapt in awake animals, when stimuli may be behaviorally relevant or not, remains unclear. Here we show that contrast adaptation in mouse primary visual cortex depends on the behavioral relevance of the stimulus. Cells that adapted to contrast under anesthesia maintained or even increased their activity in awake naïve mice. When engaged in a visually guided task, contrast adaptation re-occurred for stimuli that were irrelevant for solving the task. However, contrast adaptation was reversed when stimuli acquired behavioral relevance. Regulation of cortical adaptation by task demand may allow dynamic control of sensory-evoked signal flow in the neocortex.

scholarly journals Contrast adaptation reveals higher-order color processing in the visual evoked potential

2010 ◽  
Vol 9 (8) ◽  
pp. 312-312
Author(s):  
C. Duncan ◽  
E. Roth ◽  
Y. Mizokami ◽  
M. Crognale
Keyword(s):  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Higher Order ◽  
Color Processing ◽  
Contrast Adaptation ◽  
Visual Evoked
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