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Related Experiment Videos

Better without (lateral) frontal cortex? Insight problems solved by frontal patients.

Carlo Reverberi1, Alessio Toraldo, Serena D'Agostini

  • 1International School for Advanced Studies (SISSA-ISAS), Trieste, Italy. carlo.reverberi@unimib.it

Brain : a Journal of Neurology
|June 25, 2005
PubMed
Summary
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Patients with lateral frontal cortex damage surprisingly excel at insight problems like the matchstick task. This supports theories on frontal lobe functions in task-specific response selection and bias.

Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • The prefrontal cortex, particularly the dorsolateral aspect, is theorized to define and bias task-appropriate responses for non-routine tasks.
  • Frith's 'sculpting the response space' hypothesis posits a key role for the dorsolateral frontal cortex in cognitive flexibility.

Purpose of the Study:

  • To test Frith's hypothesis by examining performance on an insight problem-solving task (matchstick arithmetic).
  • To investigate the counterintuitive prediction that patients with lateral frontal cortex damage might outperform healthy individuals on this task.

Main Methods:

  • Administered a matchstick arithmetic task to 35 patients with focal lateral frontal cortex lesions and 23 healthy controls.
  • Assessed problem-solving success rates, focusing on difficult 'type C' problems.

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Main Results:

  • 82% of patients with lateral frontal cortex damage solved the difficult matchstick problems.
  • Only 43% of healthy participants successfully solved these problems (Fisher's exact test, P < 0.05).

Conclusions:

  • The findings support the combined theories of Frith and Knoblich et al. regarding frontal lobe function.
  • Lateral frontal cortex integrity may be less critical for, or even inhibitory to, solving certain insight problems.