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Evidence for a minimal role of stimulus awareness in reversal of threat learning

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journal contribution
posted on 24.11.2021, 04:00 by P Homan, HL Lau, I Levy, CM Raio, DR Bach, David Podhortzer CarmelDavid Podhortzer Carmel, D Schiller
In an ever-changing environment, survival depends on learning which stimuli represent threat, and also on updating such associations when circumstances shift. It has been claimed that humans can acquire physiological responses to threat-associated stimuli even when they are unaware of them, but the role of awareness in updating threat contingencies remains unknown. This complex process-generating novel responses while suppressing learned ones-relies on distinct neural mechanisms from initial learning, and has only been shown with awareness. Can it occur unconsciously? Here, we present evidence that threat reversal may not require awareness. Participants underwent classical threat conditioning to visual stimuli that were suppressed from awareness. One of two images was paired with an electric shock; halfway through the experiment, contingencies were reversed and the shock was paired with the other image. Despite variations in suppression across participants, we found that physiological responses reflected changes in stimulus-threat pairings independently of stimulus awareness. These findings suggest that unconscious affective processing may be sufficiently flexible to adapt to changing circumstances.

History

Preferred citation

Homan, P., Lau, H. L., Levy, I., Raio, C. M., Bach, D. R., Carmel, D. & Schiller, D. (2021). Evidence for a minimal role of stimulus awareness in reversal of threat learning. Learning and Memory, 28(3), 95-103. https://doi.org/10.1101/LM.050997.119

Journal title

Learning and Memory

Volume

28

Issue

3

Publication date

01/01/2021

Pagination

95-103

Publisher

Cold Spring Harbor Laboratory

Publication status

Published

Online publication date

16/02/2021

ISSN

1072-0502

eISSN

1549-5485

Language

en