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Endogenous potentials after anterior temporal lobectomy.

J M Stapleton1, E Halgren, K A Moreno

  • 1Department of Psychology, University of California, Los Angeles 90024.

Neuropsychologia
|January 1, 1987
PubMed
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Unilateral anterior temporal lobectomy (ATL) did not alter scalp P3 potentials. Medial temporal lobe structures are not the primary generators of P3 recorded at the scalp during these tasks.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Electrophysiology

Background:

  • Anterior temporal lobectomy (ATL) removes medial temporal lobe (MTL) structures.
  • MTL structures are implicated in generating scalp potentials, including P3.
  • Understanding P3 generators is crucial for interpreting cognitive event-related potentials.

Purpose of the Study:

  • To investigate the role of medial temporal lobe structures in generating scalp P3 potentials after unilateral ATL.
  • To determine if ATL affects the amplitude, topography, or laterality of P3.

Main Methods:

  • Scalp electroencephalography (EEG) was used to record endogenous potentials.
  • Patients who underwent unilateral ATL (right or left) were compared to unoperated control subjects.

Related Experiment Videos

  • P3 potentials were analyzed for amplitude, topography, and laterality during specific cognitive tasks.

    • Main Results:

    • Patients following ATL showed no significant differences in P3 amplitude compared to controls.
    • The scalp topography of P3 remained similar across ATL groups and control subjects.
    • No differences in P3 laterality were observed between operated and unoperated individuals.

    Conclusions:

    • The medial temporal lobe is not the primary generator of P3 potentials recorded at the scalp in the studied tasks.
    • Scalp P3 generation likely involves extra-MTL structures.
    • These findings refine our understanding of the neural sources of cognitive event-related potentials.