AB052. A standardized quantification of the visual contrast response function

2018 ◽  
Vol 3 ◽  
pp. AB052-AB052
Author(s):  
Marc Demers ◽  
Nelson Cortes ◽  
Visou Andy ◽  
Bruno Oliveira ◽  
Alexie Byrns ◽  
...  
Keyword(s):  
Response Function ◽  
Visual Contrast ◽  
Contrast Response Function ◽  
Contrast Response

Crossmodal attention alters auditory contrast sensitivity

2012 ◽  
Vol 25 (0) ◽  
pp. 177
Author(s):  
Vivian Ciaramitaro ◽  
Dan Jentzen
Keyword(s):  
Visual Attention ◽  
Contrast Sensitivity ◽  
Response Function ◽  
Visual Processing ◽  
Visual Task ◽  
Contrast Gain ◽  
Crossmodal Attention ◽  
Visual Contrast ◽  
Contrast Response Function ◽  
Contrast Response

We examined the influence of covert, endogenous, crossmodal attention on auditory contrast sensitivity in a two-interval forced-choice dual-task paradigm. Attending to a visual stimulus has been found to alter the visual contrast response function via a mechanism of contrast gain for sustained visual attention, or a combination of response gain and contrast gain for transient visual attention (Ling and Carrasco, 2006). We examined if and how auditory contrast sensitivity varied as a function of attentional load, the difficulty of a competing visual task, and how such effects compared to those found for the influences of attention on visual processing. In our paradigm, subjects listened to two sequential white noise stimuli, one of which was amplitude modulated. Subjects reported which interval contained the amplitude modulated auditory stimulus. At the same time a sequence of 5 letters was presented, in an rsvp stream at central fixation, for each interval. Subjects judged which interval contained the visual target. For a given block of trials, subjects judged which interval contained white letters (easy visual task) or, in a separate block of trials, which interval had more target letters ‘A’ (difficult visual task). We found that auditory thresholds were lower for the easy compared to the difficult visual task and that the shift in the auditory contrast response function was reminiscent of a contrast gain mechanism for visual contrast. Importantly, we found that the effects of crossmodal attention on the auditory contrast response function diminished with practice.

A Simple Coding Procedure Enhances a Neuron's Information Capacity

1981 ◽  
Vol 36 (9-10) ◽  
pp. 910-912 ◽  
Author(s):  
Simon Laughlin
Keyword(s):  
Information Theory ◽  
Probability Distribution ◽  
Response Function ◽  
Compound Eye ◽  
Information Capacity ◽  
Cumulative Probability ◽  
Natural Scenes ◽  
First Order ◽  
Contrast Response Function ◽  
Contrast Response

Abstract The contrast-response function of a class of first order intemeurons in the fly's compound eye approximates to the cumulative probability distribution of contrast levels in natural scenes. Elementary information theory shows that this matching enables the neurons to encode contrast fluctuations most efficiently.

scholarly journals Porcine global flash multifocal electroretinogram: Possible mechanisms for the glaucomatous changes in contrast response function

2008 ◽  
Vol 48 (16) ◽  
pp. 1726-1734 ◽  
Author(s):  
Patrick H.W. Chu ◽  
Henry H.L. Chan ◽  
Yiu-fai Ng ◽  
Brian Brown ◽  
Andrew W. Siu ◽  
...  
Keyword(s):  
Response Function ◽  
Multifocal Electroretinogram ◽  
Global Flash ◽  
Contrast Response Function ◽  
Contrast Response

scholarly journals The human contrast response function: overcoming experimental pitfalls

2010 ◽  
Vol 7 (9) ◽  
pp. 261-261
Author(s):  
M. Katkov ◽  
M. Tsodyks ◽  
D. Sagi
Keyword(s):  
Response Function ◽  
Contrast Response Function ◽  
Contrast Response
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