Journal
NATURE HUMAN BEHAVIOUR
Volume 3, Issue 12, Pages 1252-1262Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41562-019-0725-0
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Funding
- NSF [1358756]
- European Union [702784]
- Marie Curie Actions (MSCA) [702784] Funding Source: Marie Curie Actions (MSCA)
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Habits are commonly conceptualized as learned associations whereby a stimulus triggers an associated response(1-3). We propose that habits may be better understood as a process whereby a stimulus triggers only the preparation of a response, without necessarily triggering its initiation. Critically, this would allow a habit to exist without ever being overtly expressed, if the prepared habitual response is replaced by a goal-directed alternative before it can be initiated. Consistent with this hypothesis, we show that limiting the time available for response preparation(4,5) can unmask latent habits. Participants practiced a visuomotor association for 4 days, after which the association was remapped. Participants easily learned the new association but habitually expressed the original association when forced to respond rapidly (similar to 300-600 ms). More extensive practice reduced the latency at which habitual responses were prepared, in turn increasing the likelihood of their being expressed. The time-course of habit expression was captured by a computational model in which habitual responses are automatically prepared at short latency but subsequently replaced by goal-directed responses. Our results illustrate robust habit formation in humans and show that practice affects habitual behaviour in two distinct ways: by promoting habit formation and by modulating the likelihood of habit expression.
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