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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

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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.
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.

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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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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...

Somatosensation

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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:
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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...

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A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity

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Stimulus ensemble and cortical layer determine V1 spatial receptive fields.

Chun-I Yeh¹, Dajun Xing, Patrick E Williams

¹Center for Neural Science, New York University, New York, NY 10003, USA. ciy@cns.nyu.edu

Proceedings of the National Academy of Sciences of the United States of America

|August 27, 2009

Summary

This summary is machine-generated.

Receptive fields in V1 neurons are not stimulus-invariant. Different stimuli reveal distinct receptive field properties in superficial V1 layers, challenging linear models of visual processing.

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Area of Science:

Neuroscience
Visual processing
Computational neuroscience

Background:

The receptive field concept in visual neuroscience assumes stimulus invariance.
Common models, like the linear-nonlinear-Poisson (LNP) model, predict similar receptive fields regardless of stimulus ensemble.
This study investigates the validity of the stimulus-invariant receptive field concept in the primary visual cortex (V1).

Purpose of the Study:

To compare spatiotemporal receptive field maps of V1 neurons using two distinct stimulus ensembles: sparse noise and Hartley subspace stimuli.
To determine if receptive field properties are consistent across different stimulus conditions.
To investigate the influence of intracortical interactions on V1 receptive fields.

Main Methods:

Spatiotemporal receptive field mapping of V1 neurons in macaque monkeys.
Utilized two different stimulus ensembles: sparse noise and Hartley subspace stimuli.
Compared receptive field maps obtained from input layer 4C and superficial layers (2/3) of V1.

Main Results:

Receptive field maps agreed between stimulus ensembles for neurons in layer 4C.
Significant differences in receptive field maps were observed for neurons in superficial V1 layers (2/3).
Layer 2/3 neurons exhibited complex, multi-lobed receptive fields with Hartley stimuli, which simplified to single-lobed fields with sparse noise. Preferred orientation also varied significantly between stimuli for these neurons.

Conclusions:

The concept of a stimulus-invariant receptive field is challenged by these findings.
Intracortical interactions in superficial V1 layers significantly shape neuronal receptive field properties.
Existing linear models may not fully capture the complexity of V1 visual processing.