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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.

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,...

Sensory Perception: Organization of the Somatosensory System

Sensory Perception: Organization of the Somatosensory System

The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...

Somatosensory, Motor, and Association Cortex

Somatosensory, Motor, and Association Cortex

The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...

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...

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Related Experiment Video

Updated: May 12, 2026

Cross-Modal Multivariate Pattern Analysis

Cross-Modal Multivariate Pattern Analysis

Published on: November 9, 2011

Cortical sensitivity to visual features in natural scenes.

Gidon Felsen¹, Jon Touryan, Feng Han

¹Division of Neurobiology, Department of Molecular and Cell Biology, University of California, Berkeley, California, USA.

|September 21, 2005

Summary

This summary is machine-generated.

Cortical neurons show higher sensitivity to visual features in natural images compared to random stimuli. This improved representation of natural scenes is linked to phase regularities, not power spectra.

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Area of Science:

Neuroscience
Computational Neuroscience
Visual Processing

Background:

Neuronal circuits are hypothesized to efficiently represent natural stimuli.
Understanding cortical coding of natural images is crucial for sensory processing research.

Purpose of the Study:

To investigate novel effects in cortical coding of natural images.
To determine if neuronal sensitivity differs between natural and random stimuli for specific visual features.
To identify the underlying mechanisms driving observed sensitivity differences.

Main Methods:

Utilized spike-triggered average and spike-triggered covariance analyses to identify neuron-selective visual features.
Measured neuronal sensitivity to identified features in both natural and random stimuli.
Analyzed the role of spatial power spectra and phase regularities in observed effects.

Main Results:

Cortical complex cells, unlike simple cells, exhibited significantly higher sensitivity to visual features presented in natural images versus random stimuli.
This heightened sensitivity in complex cells enhances the detectability of visual features, improving cortical representation of natural scenes.
The observed effect was attributed to the phase regularities within natural images, rather than their spatial power spectra.

Conclusions:

Cortical complex cells employ a distinct coding strategy for natural images, leveraging phase structure for efficient representation.
Contextual modulation of cortical responses tuned to spatial-phase regularities underlies this improved visual coding.
Findings suggest specialized neuronal adaptations for processing natural visual environments.