title: Mapping dissociations in verb morphology.
abstract: Substantial behavioural and neuropsychological evidence has been amassed to support the dual-route model of morphological processing, which distinguishes between a rule-based system for regular items (walk-walked, call-called) and an associative system for the irregular items (go-went). Some neural-network models attempt to explain the neuropsychological and brain-mapping dissociations in terms of single-system associative processing. We show that there are problems in the accounts of homogeneous networks in the light of recent brain-mapping evidence of systematic double-dissociation. We also examine the superior capabilities of more internally differentiated connectionist models, which, under certain conditions, display systematic double-dissociations. It appears that the more differentiation models show, the more easily they account for dissociation patterns, yet without implementing symbolic computations.
authors: Dept of Psychology, University of Warwick, CV4 7AL, Coventry, UK
authors: A
authors: A
authors: Lavric
authors: D
authors: D
authors: Pizzagalli
authors: S
authors: S
authors: Forstmeier
authors: G
authors: G
authors: Rippon