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Self-enhancement processing in the default network: a single-pulse TMS study.

Bruce Luber1, Hans C Lou, Julian P Keenan

  • 1Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 3620, Durham, NC 27710, USA. bruce.luber@duke.edu

Experimental Brain Research
|September 12, 2012
PubMed
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This study used transcranial magnetic stimulation (TMS) to show the medial prefrontal cortex (MPFC) is crucial for self-evaluation. Disrupting MPFC reversed self-enhancement bias, highlighting its role in processing self-related information.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Social Neuroscience

Background:

  • Positive self-evaluation is linked to mental health, but its neural basis is unclear.
  • Brain imaging suggests the default network, particularly medial prefrontal cortex (MPFC), is involved in self-evaluation.
  • Previous research indicates distinct roles for parietal cortex and MPFC in self-related processing.

Purpose of the Study:

  • To causally investigate the role of the default network, specifically MPFC, in self-evaluative processing using transcranial magnetic stimulation (TMS).
  • To determine the site- and time-specific effects of disrupting MPFC on self-enhancement bias.

Main Methods:

  • Experiment 1: 27 healthy volunteers judged self-descriptive adjectives, revealing a self-enhancement bias.

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  • Experiment 2: Single-pulse TMS targeted MPFC and parietal cortex in healthy volunteers performing the adjective task.
  • TMS was applied at varying latencies (0-480 ms) to assess its impact on self-enhancement bias.

    • Main Results:

    • TMS affected self-enhancement bias in a site- and latency-specific manner.
    • At MPFC, TMS at 160 ms reversed the self-enhancement bias, causing participants to favor their best friend over themselves.
    • Parietal cortex stimulation did not show this reversal effect.

    Conclusions:

    • The medial prefrontal cortex (MPFC) plays a causal role in self-evaluative processing.
    • TMS can be a valuable tool for studying abnormal self-evaluation in mental illnesses.
    • The default network supports distinct self-related processes: parietal cortex for association retrieval and MPFC for evaluation.