Comprehension and production of verbs in aphasic speakers

The production of verbs in isolation and sentence context in Dutch
aphasics was evaluated in the present study. With respect to verb finding
in isolation, it was found that almost all patients had more problems with
verbs than nouns. Verb retrieval in sentence context was comparably
disturbed to verb retrieval in isolation. The verbs that were used in the
tests were closely controlled on linguistic factors. It was shown that two of
these factors, transitivity and instrumentality, influenced verb production in
the Broca’s aphasics and the anomics respectively, whereas name relation
with a noun and frequency did not play a role.
The fact that verbs were more difficult than nouns in the Broca’s aphasics
and the anomics does not support the existence of a double dissociation for
problems with verbs and nouns. Therefore, claims based on this double
dissociation, like the assumptions that sublexicons for nouns and verbs
exist or that problems with verbs or nouns can be related to lesion site, are
probably based on overgeneralizations.
The effects of verb type on difficulties with verb retrieval may be even
more subtle than discussed here. The overview of effects on verb
processing in chapter 1 and in this chapter shows how careful one should
be in generalizing over performance patterns. The generalisation that can
be drawn from this study is that each single aspect of the information
stored in the lexicon may influence
word retrieval. A next step is to investigate the exact relationship between
these factors and to find out how they relate to lesion site.

	titlepages/contents
	chapter 1
	chapter 2
	chapter 3
	chapter 4
	chapter 5
	chapter 6
	appendix
	grodil
	references
	samenvatting
	thesis

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