Journal
NEUROPSYCHOLOGIA
Volume 44, Issue 1, Pages 140-149Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropsychologia.2005.03.027
Keywords
priming; memory; learning; amnesia
Funding
- NIMH NIH HHS [K23 MH064004-01, K23MH64004] Funding Source: Medline
- NINDS NIH HHS [P50 NS26985] Funding Source: Medline
- NATIONAL INSTITUTE OF MENTAL HEALTH [K23MH064004] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [P50NS026985] Funding Source: NIH RePORTER
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Functional brain imaging studies of priming assume that the behavioral facilitation and activity reductions resulting from multiple repetitions reflect the continued tuning of processes engaged during the initial processing of items. Utilizing an object priming paradigm in which participants were asked to make relative size judgments about visually presented common objects, we tested an alternate hypothesis that states that with multiple repetitions participants come to rely on a more efficient response learning mechanism. In experiment 1, the decision cue was inverted such that previous judgments made either once or three times were rendered invalid. Decision inversion resulted in a reduction of all priming, but most critically, led to a reduction of multiple-repetition priming to the level of single-repetition priming. In experiment 2, patients with amnesia failed to show a priming advantage for multiple repetitions, indicating that response learning is dependent on the medial temporal lobes. Taken together, these results suggest that a different process increasingly mediates priming behavior as repetitions increase. With repeated exposure, behavioral facilitation rapidly comes to reflect a more efficient response learning mechanism rather than facilitated access to object knowledge. (c) 2005 Elsevier Ltd. All rights reserved.
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