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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.
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...
Integration of Synaptic Events01:28

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
Graded Potential01:19

Graded Potential

Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or calcium...
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.
Somatosensory, Motor, and Association Cortex01:23

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...

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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
09:42

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Compressive spatial summation in human visual cortex.

Kendrick N Kay1, Jonathan Winawer, Aviv Mezer

  • 1Department of Psychology, Stanford University, Stanford, CA, USA. kendrick@post.harvard.edu

Journal of Neurophysiology
|April 26, 2013
PubMed
Summary
This summary is machine-generated.

Visual cortex neurons show compressive spatial summation, deviating from linear models. This nonlinearity explains tolerance to object position and size changes in visual object representation.

Keywords:
fMRIhuman visual cortexpopulation receptive fieldspatial nonlinearityspatial summation

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • Neurons in visual cortex process stimuli from specific visual field regions.
  • Previous models assumed linear spatial summation of neuronal population responses.

Purpose of the Study:

  • To investigate the spatial summation properties of visual cortex population responses.
  • To test whether linear summation accurately explains observed blood oxygenation level-dependent (BOLD) responses.
  • To characterize the nature and progression of spatial summation across visual areas.

Main Methods:

  • Utilized blood oxygenation level-dependent (BOLD) functional MRI to measure brain activity.
  • Presented systematic patterns of visual contrast to participants.
  • Compared empirical BOLD data against linear summation and compressive nonlinearity models.

Main Results:

  • Observed systematic deviations from linear spatial summation.
  • A model incorporating a compressive static nonlinearity after linear summation provided a more accurate explanation of the BOLD data.
  • This compressive nonlinearity was present in early visual areas (V1, V2) and intensified in anterior extrastriate areas (LO-2, VO-2).

Conclusions:

  • Spatial summation in the visual cortex is not strictly linear but exhibits compressive properties.
  • Compressive spatial summation contributes to the visual system's tolerance for variations in object position and size.
  • This finding offers insights into the neural mechanisms underlying robust object representation.