|dc.contributor.author||Hsiao, Esther Y
Schwartz, Myrna F.
Schnur, Tatiana T
Dell, Gary S
Hsiao, Esther Y, Schwartz, Myrna F., Schnur, Tatiana T, et al.. "Temporal characteristics of semantic perseverations induced by blocked-cyclic picture naming." Brain and Language, 108, no. 3 (2009) Elsevier: 133-143. http://dx.doi.org/10.1016/j.bandl.2008.11.003.
When unimpaired participants name pictures quickly, they produce many perseverations
that bear a semantic relation to the target, especially when the pictures are blocked by category.
Evidence suggests that the temporal properties of these "semantic perseverations" may differ from
typical lexical perseverations in aphasia. To explore this, we studied semantic perseverations
generated by participants with aphasia on a naming task with semantic blocking [Schnur, T. T.,
Schwartz, M. F., Brecher, A., & Hodgson, C. (2006). Semantic interference during blocked-cyclic
naming: Evidence from aphasia. Journal of Memory and Language, 54, 199-227]. The properties
of these perseverations were investigated by analyzing how often they occurred at each lag
(distance from prior occurrence) and how time (response-stimulus interval) influenced the lag
function. Chance data sets were created by reshuffling stimulus-response pairs in a manner that
preserved unique features of the blocking design. We found that the semantic blocking
manipulation did not eliminate the expected bias for short-lag perseverations (recency bias).
However, immediate (lag 1) perseverations were not invariably the most frequent, which hints at a source of inconsistency within and across studies. Importantly, there was not a reliable difference
between the lag functions for perseverations generated with a 5 s, compared to 1 s, responsestimulus
interval. The combination of recency bias and insensitivity to elapsed time indicates that
the perseveratory impetus in a named response does not passively decay with time but rather is
diminished by interference from related trials. We offer an incremental learning account of these
This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier.
Temporal characteristics of semantic perseverations induced by blocked-cyclic picture naming
Brain and Language