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Related Experiment Videos

Frontal-lobe contribution to recency judgements.

B Milner1, P Corsi, G Leonard

  • 1Montreal Neurological Institute, Quebec, Canada.

Neuropsychologia
|January 1, 1991
PubMed
Summary
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Brain damage affecting the mid-lateral frontal cortex impairs judging the recency of verbal information. Right frontal lobe removals also impacted pictorial recency discrimination.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuropsychology

Background:

  • Recency discrimination, the ability to judge which of two items was presented more recently, is crucial for memory.
  • Previous research suggests frontal lobe involvement in temporal order memory, but specific roles of different regions and hemispheres remain debated.

Purpose of the Study:

  • To investigate the effects of unilateral cortical removals on recency-discrimination abilities across different stimulus types (verbal, pictorial).
  • To examine hemispheric specialization in recency judgments based on stimulus material.

Main Methods:

  • 117 patients with unilateral cortical removals and 20 healthy controls performed three recency-discrimination tasks: concrete words, representational drawings, and abstract paintings.
  • Surgical sites included frontal and anterior temporal lobes, with specific attention to mid-lateral frontal cortex involvement.

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Main Results:

  • Frontal or anterior temporal lobe excisions did not affect simple item recognition.
  • Left or right anterior temporal lobectomy did not impair recency judgments for any task.
  • Excisions involving the mid-lateral frontal cortex impaired verbal recency judgments, with a milder deficit after right frontal lobectomy.
  • Right frontal lobe removals resulted in the most significant impairment in recency discrimination for pictorial tasks.

Conclusions:

  • Evidence supports hemispheric specialization in recency discrimination, dependent on stimulus material.
  • The left mid-lateral frontal cortex plays a functional role in verbal recency judgments.
  • The right frontal lobe is implicated in recency discrimination of pictorial information.