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Related Concept Videos

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.
Association Areas of the Cortex01:21

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,...
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...
Auditory Pathway01:15

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Auditory Perception01:17

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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Cross-Modal Multivariate Pattern Analysis
13:51

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Published on: November 9, 2011

Functionally specific oscillatory activity correlates between visual and auditory cortex in the blind.

Inga M Schepers1, Joerg F Hipp, Till R Schneider

  • 1Department of Neurophysiology and Pathophysiology University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany. i.schepers@uke.de

Brain : a Journal of Neurology
|February 28, 2012
PubMed
Summary
This summary is machine-generated.

The visual cortex in blind individuals processes non-visual information, particularly sounds. Gamma-band oscillations in the visual cortex correlate with auditory processing and semantic tasks, showing cross-modal plasticity.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Plasticity

Background:

  • The visual cortex in blind individuals often shows activation during non-visual tasks, a phenomenon known as cross-modal plasticity.
  • The specific electrophysiological signals driving this plasticity remain largely uncharacterized.

Purpose of the Study:

  • To investigate neuronal population activity in the visual and auditory cortices of congenitally blind and sighted individuals during a complex cognitive task.
  • To elucidate the electrophysiological underpinnings of cross-modal plasticity in the human brain.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity.
  • Participants performed a semantic categorization task involving meaningful sounds and haptic objects.
  • Source analysis of spectrally resolved MEG data was applied.

Main Results:

  • Auditory stimulation evoked stronger and prolonged responses in the auditory cortex of blind subjects.
  • The visual cortex of blind subjects exhibited oscillatory responses to auditory stimuli, similar to visual responses in sighted individuals.
  • Gamma-band activity in the visual cortex was modulated by semantic congruency between auditory and haptic stimuli and correlated with auditory cortex activity.

Conclusions:

  • Oscillatory activity in the gamma frequency range reflects non-visual processing within the visual cortex of blind individuals.
  • The findings suggest that the deprived visual cortex is integrated into a broader neural network for non-visual functions.