Differences and interactions between cerebral hemispheres when processing ambiguous words

Orna Peleg, Zohar Eviatar, Hananel Hazan, Larry Manevitz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

It is well known that the brain (especially the cortex) is structurally separable into two hemispheres. Many neuropsychological studies show that the process of ambiguity resolution requires the intact functioning of both cerebral hemispheres. Moreover, these studies suggest that while the Left Hemisphere (LH) quickly selects one alternative, the Right Hemisphere (RH) maintains alternate meanings. However, these hemispheres are connected through the corpus callosum and presumably the exchange of information is useful. In addition, many works show that the Left Hemisphere (LH) is more influenced by the phonological aspect of written words whereas lexical processing in the Right Hemisphere (RH) is more sensitive to visual form. This distinction suggests that the interconnections between the hemispheres may be used to strengthen or correct incorrect interpretations by one hemisphere. We test this hypothesis by (I) postulating that in the Left Hemisphere (LH) orthography, phonology and semantics are interconnected while (II) the Right Hemisphere (RH), phonology is not connected directly to orthography and hence its influence must be mitigated by semantical processing (III) seeing if corrections in ambiguous word processing can be aided by information in the other hemisphere. We investigate this by complementary human psychophysical experiments and by dual (one RH and one LH) computational neural network model architecturally modified from Kawamoto's (1993) model to follow our hypothesis. Since the different models have different rates of convergence, we test (III) by halting processing, and using an analogue to priming to compare the rate of convergence to a corrected semantics in the LH working alone and working with information obtained from the RH at the same point in processing. In this paper we present results of the computational model and show that (I) the results obtained from the two hemispheres separately are analogous to the human experiments and (II) the use of the RH information does indeed help such corrections.

Original languageEnglish
Title of host publicationAttention in Cognitive Systems
Subtitle of host publicationTheories and Systems from an Interdisciplinary Viewpoint - 4th International Workshop on Attention in Cognitive Systems, WAPCV 2007, Revised Selected Papers
PublisherSpringer Verlag
Pages367-380
Number of pages14
ISBN (Print)3540773428, 9783540773429
DOIs
StatePublished - 2007
Event4th International Workshop on Attention in Cognitive Systems, WAPCV 2007 - Hyderabad, India
Duration: 8 Jan 20078 Jan 2007

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume4840 LNAI
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference4th International Workshop on Attention in Cognitive Systems, WAPCV 2007
Country/TerritoryIndia
CityHyderabad
Period8/01/078/01/07

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science (all)

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