Semantic knowledge influences whether novel episodic associations are represented symmetrically or asymmetrically.

Semantic knowledge influences whether novel episodic associations are represented symmetrically or asymmetrically.
Mem Cognit. 2019 Jun 18;:
Authors: Popov V, Zhang Q, Koch GE, Calloway RC, Coutanche MN
Abstract
We provide new evidence concerning two opposing views of episodic associations: The independent-association hypothesis posits that associations are unidirectional and separately modifiable links (A→B and A←B); in contrast, the associative-symmetry hypothesis proposes that a single, bidirectional association exists between A and B (A↔B). We used a novel method to demonstrate that whether or not episodic associations are symmetric depends on whether there is a preexisting semantic relationship between A and B. In two experiments, participants studied 30 semantically unrelated and 30 semantically related pairs intermixed in a single list and then performed a series of up to eight cued-recall test cycles. All pairs were tested in each cycle, and the testing direction (A-? or B-?) alternated between cycles. Unrelated pairs exhibited associative symmetry-that is, accuracy and response times improved gradually on each test-suggesting that testing in both directions strengthened the same association. In contrast, semantically related pairs exhibited a stair-like pattern, in which performance did not change from odd to even tests when the test direction changed; it only improved between tests in the same direction. We concluded ...

Source: Memory and Cognition - June 21, 2019 Category: Neuroscience Tags: Mem Cognit Source Type: research