Dynamic contrast change produces rapid gain control in visual cortex

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Contrast Gain Control in Auditory Cortex

The auditory system must represent sounds with a wide range of statistical properties. One important property is the spectrotemporal contrast in the acoustic environment: the variation in sound pressure in each frequency band, relative to the mean pressure. We show that neurons in ferret auditory cortex rescale their gain to partially compensate for the spectrotemporal contrast of recent stimul...

متن کامل

Including Contrast Gain Control in a Parallel Simulation of the Visual Cortex

Neurons in the striate cortex have a compressive contrast response but possess orientation and spatial frequency tuning functions which do not saturate at high contrasts This suggests that contrast compression is achieved by means of gain control rather than by output saturation I present the results of in cluding a contrast gain control model as part of a large scale simulation of the vision s...

متن کامل

Contrast gain control in the visual cortex: monocular versus binocular mechanisms.

In this study, we compare binocular and monocular mechanisms underlying contrast encoding by binocular simple cells in primary visual cortex. At mid to high levels of stimulus contrast, contrast gain of cortical neurons typically decreases as stimulus contrast is increased (). We have devised a technique by which it is possible to determine the relative contributions of monocular and binocular ...

متن کامل

Contrast gain control in the cat's visual system.

We have examined the idea that the adaptation of cortical neurons to local contrast levels in a visual stimulus is functionally advantageous. Specifically, cortical cells may have large differential contrast sensitivity as a result of adjustments that center a limited response range around a mean level of contrast. To evaluate this notion, we measured contrast-response functions of cells in str...

متن کامل

Contrast Gain Shapes Visual Time

Traditionally time perception has been considered the product of a central, generic, cognitive mechanism. However, evidence is emerging for a distributive system with modality-specific sensory components (Morrone et al., 2005; Johnston et al., 2006). Here we show that fast contrast adaptation, which can be observed in the retina, induces a change in apparent duration. The perceived duration of ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: The Journal of Physiology

سال: 2008

ISSN: 0022-3751

DOI: 10.1113/jphysiol.2008.156273