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Related Concept Videos

Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.

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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Population response to contextual influences in the primary visual cortex.

Elhanan Meirovithz1, Inbal Ayzenshtat, Yoram S Bonneh

  • 1Gonda Multidisciplinary Brain Research Center, Bar-Ilan University, Ramat Gan, Israel.

Cerebral Cortex (New York, N.Y. : 1991)
|September 18, 2009
PubMed
Summary

Collinear flankers enhance visual target detection by increasing neuronal activity and synchrony in the primary visual cortex. This population synchrony, not just activity amplitude, helps distinguish contextual effects.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Subthreshold neuronal interactions beyond the classical receptive field influence visual target detection.
  • The precise neuronal mechanisms underlying flanker effects remain incompletely understood.

Purpose of the Study:

  • To investigate the role of subthreshold population activity and synchrony in mediating the effects of collinear and orthogonal flankers on visual target detection.
  • To elucidate the neuronal mechanisms of contextual modulation in the primary visual cortex.

Main Methods:

  • Voltage-sensitive dye imaging was employed to capture subthreshold population activity in the primary visual cortex of fixating monkeys.
  • Monkeys were presented with low-contrast Gabor targets flanked by either collinear or orthogonal stimuli.
  • High spatial and temporal resolution imaging was used to analyze neuronal responses.

Main Results:

  • Collinear flankers increased neuronal activity and decreased response latency at the target site, with activity less than linear summation.
  • Flankers alone induced significant spatial filling-in at the target site.
  • Neuronal activity at the target site exhibited increased temporal synchrony, both locally and with flanker sites, which was higher for collinear flankers.

Conclusions:

  • Population synchrony, rather than amplitude, serves as a critical code for discriminating between collinear and orthogonal flanker effects.
  • Neuronal synchrony in the primary visual cortex is a key mechanism for processing contextual information and modulating visual perception.