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Related Experiment Videos

The right hemisphere maintains solution-related activation for yet-to-be-solved problems.

M J Beeman1, E M Bowden

  • 1Rush Medical College, Chicago, Illinois, USA. mejung@cattell.psych.upenn.edu

Memory & Cognition
|December 29, 2000
PubMed
Summary

Solving insight problems involves both brain hemispheres initially, but sustained solution activation occurs primarily in the right hemisphere (RH). This highlights the RH

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Neuroscience

Background:

  • Insight problem-solving relies on accessing less common interpretations of problem elements.
  • The right hemisphere (RH) is hypothesized to support coarse semantic coding, beneficial for unusual interpretations.
  • The left hemisphere (LH) is associated with fine semantic coding, potentially hindering insight.

Purpose of the Study:

  • To investigate the temporal dynamics of hemispheric involvement in insight problem-solving.
  • To test the hypothesis that the RH maintains semantic activation crucial for insight.
  • To examine how solution activation evolves over time and differs between hemispheres.

Main Methods:

  • Five experiments were conducted using word problems with varying solution times (2-7 seconds).

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  • Participants responded to lateralized target words presented at different time intervals after problem-solving attempts.
  • Measures included solution-related priming (naming solutions faster) and decision times for target words presented to either visual field (and thus, contralateral hemisphere).

    • Main Results:

    • After extended problem-solving (7 seconds), greater solution-related priming was observed for RH targets, indicating RH involvement.
    • Initially (2 seconds) or with brief exposure (1250 ms), solution activation was symmetric across hemispheres.
    • Men showed a slight RH advantage in priming after 2 seconds, while women showed symmetric priming.

    Conclusions:

    • Solution activation for insight problems begins in both hemispheres.
    • Sustained solution activation, critical for insight, is primarily maintained by the right hemisphere.
    • Hemispheric roles in insight problem-solving are time-dependent, with the RH playing a key role in maintaining activation.