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Related Concept Videos

Vision01:24

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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.
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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...
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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:
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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.
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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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The Retina01:32

The Retina

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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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Topographical Estimation of Visual Population Receptive Fields by fMRI
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WIDESPREAD RECEPTIVE FIELD REMAPPING IN EARLY VISUAL CORTEX.

Sachira Denagamage1,2,3, Mitchell P Morton1,2, Nyomi V Hudson1

  • 1Department of Neuroscience, Yale University, New Haven, CT 06510.

Biorxiv : the Preprint Server for Biology
|May 19, 2023
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Summary
This summary is machine-generated.

Visual stability during eye movements relies on predictive remapping. This study reveals widespread remapping in Area V2, maintaining and even enhancing neural feature selectivity.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Perceptual stability during eye movements is crucial for vision.
  • Predictive remapping of neuronal receptive fields is a proposed mechanism for this stability.
  • The precise dynamics and impact of remapping on neural tuning remain unclear.

Approach:

  • Tracked receptive field remapping in hundreds of neurons in visual Area V2.
  • Utilized a cued saccade task in human subjects.
  • Analyzed neural responses to understand remapping dynamics and feature selectivity.

Key Points:

  • Remapping in Area V2 is more widespread than previously thought, present across all cortical layers and cell types.
  • Neurons undergoing remapping show sensitivity to two spatial locations.
  • Feature selectivity is preserved and transiently enhanced during remapping due to untuned suppression.

Conclusions:

  • The study elucidates the spatiotemporal dynamics and broad prevalence of remapping in early visual cortex.
  • Findings necessitate revisions to current models of perceptual stability.
  • Highlights the role of predictive remapping in maintaining visual continuity.