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Related Concept Videos

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,...
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.
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...
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...
Parallel Processing01:20

Parallel Processing

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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Related Experiment Video

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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

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Published on: August 1, 2018

Relationship between neural responses and visual grouping in the monkey parietal cortex.

Isao Yokoi1, Hidehiko Komatsu

  • 1Division of Sensory and Cognitive Information, National Institute for Physiological Sciences, Okazaki, Aichi, Japan.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 23, 2009
PubMed
Summary

Neurons in the lateral intraparietal sulcus (L-IPS) are crucial for visual grouping. This brain region integrates visual and attentional signals to bind elements, aiding object perception.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Visual grouping, the binding of discrete elements, is essential for object perception.
  • The posterior parietal cortex is known to play a critical role in visual grouping processes.

Purpose of the Study:

  • To investigate the neural mechanisms underlying visual grouping.
  • To determine if lateral intraparietal sulcus (L-IPS) neurons are involved in visual grouping and selective response to grouped objects.
  • To examine the influence of attention on L-IPS neuronal activity during visual grouping tasks.

Main Methods:

  • Neuronal activity was recorded from the L-IPS of monkeys.
  • Monkeys performed a task requiring discrimination of rapidly presented visual patterns (dots).
  • Attention was manipulated to assess its effect on grouping-related neural activity.

Main Results:

  • Many L-IPS neurons exhibited selectivity for the orientation of target stimuli.
  • Top-down attention significantly enhanced this neuronal selectivity.
  • The observed selectivity correlated with the monkeys' behavioral performance in the task.

Conclusions:

  • L-IPS neurons are critically involved in visual grouping.
  • These neurons integrate visual and attentional signals to bind discrete visual elements.
  • This provides the first physiological evidence for L-IPS's role in visual binding.