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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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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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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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Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
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Bilateral motor cortex functional differences in left-handed approaching-avoiding behavior.

Xue Xia1,2, Yanling Pi3, Jing Xia1

  • 1School of Psychology, Shanghai University of Sport, Shanghai, China.

Psychophysiology
|October 17, 2022
PubMed
Summary

Automatic action tendencies were studied in non-dominant left-hand movements. Left primary motor cortex (M1) showed early involvement in approaching emotional stimuli, unlike the right M1.

Keywords:
automatic action tendencyleft-handed movementmanikin taskprimary motor cortextranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • Automatic action tendencies are observed in dominant hand tasks, affecting reaction times and primary motor cortex (M1) excitability.
  • The role of these tendencies in non-dominant left-hand approaching-avoiding behavior is not well understood.

Purpose of the Study:

  • To investigate automatic action tendencies during non-dominant left-hand approaching-avoiding behavior.
  • To examine the neurophysiological underpinnings using transcranial magnetic stimulation (TMS).

Main Methods:

  • 18 participants performed an approaching-avoiding task with their non-dominant left hand.
  • Single-pulse TMS was applied over left or right M1 at 150 and 300 ms post-stimulus.
  • Reaction times (RTs) and motor-evoked potentials (MEPs) were recorded.

Main Results:

  • Behavioral automatic action tendencies were significant during left-hand task performance.
  • Higher MEP amplitudes in the right hand (contralateral to left M1) occurred during regulated vs. automatic behavior at 150 ms.
  • No significant modulation of MEP amplitudes was found for the left hand (contralateral to right M1).

Conclusions:

  • Left primary motor cortex (M1) appears crucial in the early stages of mediating left-handed movements towards emotional stimuli.
  • Behavioral automaticity in left-hand tasks may involve distinct neurophysiological mechanisms compared to the dominant hand.