Preservation of Person-Specific Semantic Knowledge in Semantic Dementia: Does Direct Personal Experience Have a Specific Role?
Abstract
Semantic dementia patients seem to have better knowledge of information linked to
the self. More specifically, despite having severe semantic impairment, these patients
show that they have more general information about the people they know personally
by direct experience than they do about other individuals they know indirectly. However,
the role of direct personal experience remains debated because of confounding factors
such as frequency, recency of exposure, and affective relevance. We performed an
exploratory study comparing the performance of five semantic dementia patients with
that of 10 matched healthy controls on the recognition (familiarity judgment) and
identification (biographic information recall) of personally familiar names vs. famous
names. As expected, intergroup comparisons indicated a semantic breakdown in
semantic dementia patients as compared with healthy controls. Moreover, unlike healthy
controls, the semantic dementia patients recognized and identified personally familiar
names better than they did famous names. This pattern of results suggests that
direct personal experience indeed plays a specific role in the relative preservation of
person-specific semantic meaning in semantic dementia. We discuss the role of direct
personal experience on the preservation of semantic knowledge and the potential
neurophysiological mechanisms underlying these processes.
Origin : Publisher files allowed on an open archive
Licence : CC BY - Attribution
Licence : CC BY - Attribution