Perceptual and semantic contributions to repetition priming of environmental sounds

DE Lucia, Marzia, Cocchi, Luca, Martuzzi, Roberto, Meuli, Reto A., Clarke, Stephanie and Murray, Micah M. (2010) Perceptual and semantic contributions to repetition priming of environmental sounds. Cerebral Cortex, 20 7: 1676-1684. doi:10.1093/cercor/bhp230


Author DE Lucia, Marzia
Cocchi, Luca
Martuzzi, Roberto
Meuli, Reto A.
Clarke, Stephanie
Murray, Micah M.
Title Perceptual and semantic contributions to repetition priming of environmental sounds
Journal name Cerebral Cortex   Check publisher's open access policy
ISSN 1047-3211
1460-2199
Publication date 2010-07-01
Sub-type Article (original research)
DOI 10.1093/cercor/bhp230
Open Access Status Not Open Access
Volume 20
Issue 7
Start page 1676
End page 1684
Total pages 9
Place of publication Oxford, England, U. K.
Publisher Oxford University Press
Language eng
Abstract Three experiments assessed the effects of prime-processing instructions on associative priming in word identification and episodic memory for primes. In Experiment 1, groups instructed to read the prime silently or generate silently an associate of the prime showed a larger accuracy benefit for related over unrelated targets than did a group that decided whether an asterisk was to the right or left of the prime. The asterisk-search group showed a weaker repetition effect on a subsequent identification test of primes, indicating that the weaker priming in this group was a result of poorer perceptual processing. On a cued-recall test for primes, the generate group was superior to the other groups. In Experiment 2, we found that with weak prime-target associations, priming was comparable for read and generate groups and stronger than estimated for a guessing strategy, on the basis of single predictions made from each prime by an additional group. In Experiment 3, we demonstrated that the read and generate instructions produced similar mispriming and inhibitory effects. The results suggest that the depths of prime-processing manipulations do not have parallel effects on priming and episodic memory, and that associative priming in word identification, as in other tasks, may involve an expectancy process.
Formatted abstract
Repetition of environmental sounds, like their visual counterparts, can facilitate behavior and modulate neural responses, exemplifying plasticity in how auditory objects are represented or accessed. It remains controversial whether such repetition priming/suppression involves solely plasticity based on acoustic features and/or also access to semantic features. To evaluate contributions of physical and semantic features in eliciting repetition-induced plasticity, the present functional magnetic resonance imaging (fMRI) study repeated either identical or different exemplars of the initially presented object; reasoning that identical exemplars share both physical and semantic features, whereas different exemplars share only semantic features. Participants performed a living/man-made categorization task while being scanned at 3T. Repeated stimuli of both types significantly facilitated reaction times versus initial presentations, demonstrating perceptual and semantic repetition priming. There was also repetition suppression of fMRI activity within overlapping temporal, premotor, and prefrontal regions of the auditory "what" pathway. Importantly, the magnitude of suppression effects was equivalent for both physically identical and semantically related exemplars. That the degree of repetition suppression was irrespective of whether or not both perceptual and semantic information was repeated is suggestive of a degree of acoustically independent semantic analysis in how object representations are maintained and retrieved.
Keyword Auditory
Fmri
Object Recognition
Perceptual priming
Semantic priming
What and where pathways
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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