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Vision

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.

Parallel Processing

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

Visual System

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 Eyeball

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,...

Motor and Sensory Areas of the Cortex

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.

Association Areas of the Cortex

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,...

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Related Experiment Video

Updated: May 26, 2026

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Published on: February 19, 2014

Parallel development of orientation maps and spatial frequency selectivity in cat visual cortex.

Toshiki Tani¹, Jérôme Ribot, Kazunori O'Hashi

¹Laboratory for Visual Neurocomputing, Brain Science Institute, RIKEN, Wako, Saitama, Japan. tani@riken.jp

The European Journal of Neuroscience

|January 4, 2012

Summary

This summary is machine-generated.

Visual cortex development in cats shows that orientation maps mature alongside spatial frequency selectivity. Early development favors cardinal orientations, shifting to oblique orientations in young adults, indicating ongoing map refinement.

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Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

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Published on: February 19, 2014

Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging

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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

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Area of Science:

Neuroscience
Developmental Biology
Visual System

Background:

Postnatal development of the cat's visual cortex involves the maturation of orientation maps and spatial frequency selectivity.
Understanding the timeline of these developments is crucial for comprehending visual system organization.

Purpose of the Study:

To investigate the time course of orientation map maturation in relation to the consolidation of spatial frequency selectivity in cats.
To analyze age-dependent changes in orientation representation bias and their correlation with spatial frequency processing.

Main Methods:

Optical imaging of intrinsic signals in areas 17 and 18 of cat brains.
Stimulation using drifting square-wave gratings with varying orientations and spatial frequencies at different developmental stages.

Main Results:

Orientation maps for lower spatial frequencies emerged first, followed by maturation of higher spatial frequency maps.
An anteroposterior gradient of spatial frequency response was observed, suggesting innate regional determination.
Orientation representation bias shifted from cardinal to oblique orientations between 3 and 9 months of age.

Conclusions:

Orientation maps and spatial frequency selectivity undergo significant development during the first year of postnatal life in cats.
Both intrinsic and interactive factors contribute to the refinement of orientation maps and spatial frequency processing in the visual cortex.