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Related Concept Videos

Association Areas of the Cortex01:21

Association Areas of the Cortex

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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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Motor and Sensory Areas of the Cortex01:14

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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
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Somatosensory, Motor, and Association Cortex01:23

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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...
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Vision01:24

Vision

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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.
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Parallel Processing01:20

Parallel Processing

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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...
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Lobes of the Cerebrum01:22

Lobes of the Cerebrum

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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
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The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements....
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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

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Prefrontal cortex modulates posterior alpha oscillations during top-down guided visual perception.

Randolph F Helfrich1,2, Melody Huang3, Guy Wilson3

  • 1Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720; rhelfrich@berkeley.edu.

Proceedings of the National Academy of Sciences of the United States of America
|August 16, 2017
PubMed
Summary
This summary is machine-generated.

Frontal delta brainwaves control visual perception by modulating posterior alpha activity. This top-down process enhances conscious visual processing, overriding sensory entrainment effects.

Keywords:
alpha oscillationsdirectional cross-frequency couplingphase–amplitude couplingprefrontal cortextop-down control

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Electrophysiology

Background:

  • Conscious visual perception involves synchronized activity across distributed cortical areas.
  • Different brainwave frequency bands are associated with distinct neural computations.

Purpose of the Study:

  • To investigate the role of oscillatory dynamics in prefrontal-dependent sensory processing.
  • To determine if predictive context in a visual stream influences near-threshold target perception.
  • To examine the temporal dynamics of brain oscillations during visual perception.

Main Methods:

  • Presented visual streams rhythmically (10 Hz) or arrhythmically to entrain parietooccipital alpha oscillations.
  • Used source-reconstructed electroencephalography (EEG) and cross-frequency analyses.
  • Measured behavioral responses to near-threshold visual targets.

Main Results:

  • Identified a 2- to 4-Hz delta brainwave signature modulating posterior alpha activity and behavior during predictive trials.
  • Delta-mediated top-down control reduced the impact of bottom-up alpha entrainment on perception.
  • Source analysis indicated delta activity originated from prefrontal areas, influencing posterior alpha power.

Conclusions:

  • Converging evidence supports frontal delta-mediated top-down control of posterior alpha activity.
  • This neural mechanism selectively facilitates conscious visual perception.
  • Findings highlight the interplay between different frequency bands in sensory processing.