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Related Experiment Videos

Exceptional calendar calculation ability after early left hemispherectomy.

C Dorman1

  • 1School of Human Behavior, United States International University, San Diego, CA 92131.

Brain and Cognition
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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A male with a removed left hemisphere demonstrated above-chance date calculation skills. His method involved visual memory and serial calculations, influenced by working memory capacity.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Developmental Psychology

Background:

  • Hemispherectomy, the surgical removal of one cerebral hemisphere, can lead to significant neuroplastic changes.
  • Understanding cognitive functions after extensive brain surgery provides insights into brain organization and compensation mechanisms.

Purpose of the Study:

  • To investigate the calculation abilities of an individual who underwent a left hemispherectomy at a young age.
  • To explore the cognitive strategies employed for date calculation in the absence of a complete cerebral hemisphere.

Main Methods:

  • Case study of an 18-year-old male with a history of left hemispherectomy.
  • Assessment of calendar calculation skills for past and future dates.
  • Analysis of calculation methods, including response time, accuracy, and interference effects from memory tasks.

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Main Results:

  • The subject exhibited a statistically significant ability to calculate the day of the week for given dates.
  • Calculation strategies involved a combination of visual memory and serial processing.
  • Performance metrics indicated a reliance on serial calculation and working memory, with interference observed from concurrent cognitive tasks.

Conclusions:

  • Individuals who have undergone hemispherectomy can develop remarkable compensatory cognitive skills.
  • The findings support theories on the plasticity of the brain and the potential for intact hemispheres to support complex cognitive functions.
  • The case offers a unique perspective on the neural underpinnings of calculation and memory.