scholarly journals Contrast gain control and summing circuit bandwidths in fine spatial frequency discriminations

2010 ◽  
Vol 8 (17) ◽  
pp. 72-72
Author(s):  
L. A. Olzak ◽  
P. J. Hibbeler
Keyword(s):  
Spatial Frequency ◽  
Gain Control ◽  
Contrast Gain ◽  
Contrast Gain Control

A cortical locus for anisotropic overlay suppression of stimuli presented at fixation

2015 ◽  
Vol 32 ◽  
Author(s):  
BRUCE C. HANSEN ◽  
BRUNO RICHARD ◽  
KRISTIN ANDRES ◽  
AARON P. JOHNSON ◽  
BENJAMIN THOMPSON ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Gain Control ◽  
Broadband Noise ◽  
Contrast Gain ◽  
Contrast Gain Control ◽  
Control Processes ◽  
Neural Simulation ◽  
Anisotropic Form ◽  
Suppression Process ◽  
Additional Form

AbstractHuman contrast sensitivity for narrowband Gabor targets is suppressed when superimposed on narrowband masks of the same spatial frequency and orientation (referred to as overlay suppression), with suppression being broadly tuned to orientation and spatial frequency. Numerous behavioral and neurophysiological experiments have suggested that overlay suppression originates from the initial lateral geniculate nucleus (LGN) inputs to V1, which is consistent with the broad tuning typically reported for overlay suppression. However, recent reports have shown narrowly tuned anisotropic overlay suppression when narrowband targets are masked by broadband noise. Consequently, researchers have argued for an additional form of overlay suppression that involves cortical contrast gain control processes. The current study sought to further explore this notion behaviorally using narrowband and broadband masks, along with a computational neural simulation of the hypothesized underlying gain control processes in cortex. Additionally, we employed transcranial direct current stimulation (tDCS) in order to test whether cortical processes are involved in driving narrowly tuned anisotropic suppression. The behavioral results yielded anisotropic overlay suppression for both broadband and narrowband masks and could be replicated with our computational neural simulation of anisotropic gain control. Further, the anisotropic form of overlay suppression could be directly modulated by tDCS, which would not be expected if the suppression was primarily subcortical in origin. Altogether, the results of the current study provide further evidence in support of an additional overlay suppression process that originates in cortex and show that this form of suppression is also observable with narrowband masks.

Spatial frequency adaptation and contrast gain control

1993 ◽  
Vol 33 (8) ◽  
pp. 1133-1149 ◽  
Author(s):  
Hugh R. Wilson ◽  
Richard Humanski
Keyword(s):  
Spatial Frequency ◽  
Gain Control ◽  
Contrast Gain ◽  
Contrast Gain Control ◽  
Frequency Adaptation

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

scholarly journals Depth-dependent contrast gain-control

2010 ◽  
Vol 3 (9) ◽  
pp. 49-49
Author(s):  
R. N Aslin ◽  
R. A Jacobs ◽  
P. W Battaglia
Keyword(s):  
Gain Control ◽  
Contrast Gain ◽  
Contrast Gain Control

Contrast gain control in the cat visual cortex

Nature ◽  
1982 ◽  
Vol 298 (5871) ◽  
pp. 266-268 ◽  
Author(s):  
I. Ohzawa ◽  
G. Sclar ◽  
R. D. Freeman
Keyword(s):  
Visual Cortex ◽  
Gain Control ◽  
Contrast Gain ◽  
Contrast Gain Control ◽  
Cat Visual Cortex

Callosal regulation of contrast gain control machinery in the human visual system

2013 ◽  
Vol 333 ◽  
pp. e608
Author(s):  
T. Bocci ◽  
M. Caleo ◽  
L. Restani ◽  
L. Briscese ◽  
E. Giorli ◽  
...  
Keyword(s):  
Visual System ◽  
Human Visual System ◽  
Gain Control ◽  
Contrast Gain ◽  
Contrast Gain Control
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