A PDP Simulation of the Effects of Transcranial Magnetic Stimulation on Semantic Cognition

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • Authors:
  • Stephen Welbourne
  • Neils Taatgen (Editor)
  • Hedderik van Rijn (Editor)

Abstract

Transcranial magnetic stimulation (TMS) is a useful tool for determining cortical interactions that take place during semantic cognition (Pobric et al, 2007). TMS of the anterior temporal lobe (ATL) induces specificity-graded conceptual breakdown of stored representations resulting in differential effects on naming tasks depending on the level of specificity required. This paper aims to elucidate this effect using the Rogers et al (2004) model of semantic cognition. TMS effects are modelled by reducing the gain of the affected units to simulate reduction in neuronal sensitivity. Results show that basic-level naming is more robust to rTMS than subordinate level naming as found by Pobric et al. In addition the model predicts that superordinate naming should be even more robust to rTMS than basic level naming. This specificity-graded breakdown of semantic memory appears to be independent of learnt word frequency. This supports evidence that the ATL’s function is that of category differentiation.

Bibliographical metadata

Original languageEnglish
Title of host publicationProceedings of the 31th Annual Conference of the Cognitive Science Society
EditorsNeils Taatgen, Hedderik van Rijn
PublisherCognitive Science Society
Pages508-513
Number of pages6
ISBN (Print)ISBN 978-0-9768318-5-3
Publication statusPublished - Jul 2009
EventCogSci - Amsterdam
Event duration: 29 Jul 20091 Aug 2010

Conference

ConferenceCogSci
CityAmsterdam
Period29/07/091/08/10