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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

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 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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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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Visual System01:26

Visual System

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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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Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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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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Automated Visual Cognitive Tasks for Recording Neural Activity Using a Floor Projection Maze
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Task-related activity in human visual cortex.

Zvi N Roth1, Minyoung Ryoo1, Elisha P Merriam1

  • 1Laboratory of Brain and Cognition, National Institute of Mental Health, NIH, Bethesda, Maryland, United States of America.

Plos Biology
|November 6, 2020
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Summary
This summary is machine-generated.

Brain activity in the visual cortex occurs without visual input and is linked to arousal. Higher rewards enhance this brain response, suggesting increased neural precision.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Neuroscience

Background:

  • The brain shows spontaneous neural activity even without external stimuli, particularly in early visual processing.
  • Previous studies in monkeys used optical imaging to explore these endogenous responses in the visual cortex.

Purpose of the Study:

  • To investigate the relationship between arousal and endogenous neural responses in the human visual cortex using functional MRI (fMRI).
  • To explore how reward influences these arousal-related neural dynamics.

Main Methods:

  • Utilized functional MRI (fMRI) in human participants to measure brain activity.
  • Monitored physiological signals such as pupil size and heart rate.
  • Analyzed the relationship between neural responses, task timing, arousal indicators, and reward levels.
  • Employed computational simulations to interpret the observed neural dynamics.

Main Results:

  • Identified spatially extensive endogenous responses in the visual cortex, synchronized with task timing and independent of visual stimulation.
  • Observed that these task-related neural responses mirrored the dynamics of pupil size and heart rate, indicating a link to arousal.
  • Found that increased reward led to greater response amplitude and reduced trial-to-trial variability (noise) in neural activity.
  • Computational models suggested that enhanced temporal precision of neural activity underlies these reward-related effects.

Conclusions:

  • Task-related endogenous activity in the visual cortex is closely associated with arousal levels.
  • Arousal appears to enhance the precision of neural signaling in the visual cortex.
  • Findings align with previous monkey studies and highlight the role of arousal in neural processing efficiency.