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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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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.
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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Allocentric representations for target memory and reaching in human cortex.

Ying Chen1,2, J Douglas Crawford2,3

  • 1Center for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada.

Annals of the New York Academy of Sciences
|October 18, 2019
PubMed
Summary
This summary is machine-generated.

Humans use visual landmarks and target information to guide movement. This study reveals how the brain converts landmark-based (allocentric) cues into action-oriented (egocentric) commands, highlighting specific brain regions involved in this transformation.

Keywords:
allocentric codingdirectional selectivityfMRIreach

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Motor Control

Background:

  • Movement guidance relies on integrating visual targets and landmarks.
  • Translating external (allocentric) cues into self-directed (egocentric) actions is a complex cognitive process.
  • Understanding the neural basis of spatial representation and action planning is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the mechanisms of encoding reach targets relative to visual landmarks in humans.
  • To identify the brain regions involved in transforming allocentric spatial information into egocentric motor commands.
  • To differentiate memory encoding mechanisms from action planning mechanisms.

Main Methods:

  • Behavioral experiments to assess target memory influenced by allocentric cues.
  • Neuroimaging techniques (fMRI) to identify brain activation patterns during spatial encoding and action planning.
  • Analysis of cortical mechanisms, including inferior temporal gyrus, superior occipital gyrus, and parieto-frontal networks.

Main Results:

  • Behavioral data indicate that both target and landmark cues influence memory, with rapid transformation into egocentric commands.
  • Distinct brain regions are involved in allocentric memory encoding (inferior temporal gyrus vs. superior occipital gyrus) versus egocentric action planning.
  • Neuroimaging identified specific parieto-frontal areas (right precuneus, bilateral dorsal premotor cortex, right presupplementary area) crucial for allocentric-to-egocentric conversion.

Conclusions:

  • Allocentric representations of reach targets are converted into egocentric plans within specific parieto-frontal cortical areas.
  • Egocentric and landmark-centered spatial representations are initially segregated in the visual system.
  • These representations are later reintegrated in the parieto-frontal cortex to facilitate goal-directed actions.