devaluation : To devaluate some food (or video clip, or any other thing) is to reduce its value, for example by allowing the agent to satiete themselves on it or by causing them to associate it with an uncomfortable event such as an electric shock or mild illness.
extinction : In some experiments, there is a phase (usually following instrumental training and an intervention such as devaluation) during which the subject encounters the training scenario exactly as it was (same stimuli, same action possibilities) but the actions produce no revant outcomes. In this extinction phase, there is no reward (nor punishment). (It is called ‘extinction’ because in many cases not rewarding (or punishing) the actions will eventually extinguish the stimulus--action links.)
goal-directed process : A process which involves ‘a representation of the causal relationship between the action and outcome and a representation of the current incentive value, or utility, of the outcome’ and which influences an action ‘in a way that rationalizes the action as instrumental for attaining the goal’ (Dickinson, 2016, p. 177).
habitual process : A process underpinning some instrumental actions which obeys Thorndyke’s Law of Effect: ‘The presentation of an effective [=rewarding] outcome following an action [...] reinforces a connection between the stimuli present when the action is performed and the action itself so that subsequent presentations of these stimuli elicit the [...] action as a response’ (Dickinson, 1994, p. 48).
instrumental action : An action is instrumental if it happens in order to bring about an outcome, as when you press a lever in order to obtain food. (In this case, obtaining food is the outcome, lever pressing is the action, and the action is instrumental because it occurs in order to bring it about that you obtain food.) You may variations on this definition of instrumental in the literature. Dickinson (2016, p. 177) characterises instrumental actions differently: in place of the teleological ‘in order to bring about an outcome’, he stipulates that an instrumental action is one that is ‘controlled by the contingency between’ the action and an outcome. And de Wit & Dickinson (2009, p. 464) stipulate that ‘instrumental actions are learned’.
de Wit, S., & Dickinson, A. (2009). Associative theories of goal-directed behaviour: A case for animalhuman translational models. Psychological Research PRPF, 73(4), 463–476. https://doi.org/10.1007/s00426-009-0230-6
Dickinson, A. (1994). Instrumental conditioning. In N. Mackintosh (Ed.), Animal learning and cognition. London: Academic Press.
Dickinson, A. (2016). Instrumental conditioning revisited: Updating dual-process theory. In J. B. Trobalon & V. D. Chamizo (Eds.), Associative learning and cognition (Vol. 51, pp. 177–195). Edicions Universitat Barcelona.
Dickinson, A., & Pérez, O. D. (2018). Actions and Habits: Psychological Issues in Dual-System Theory. In R. Morris, A. Bornstein, & A. Shenhav (Eds.), Goal-Directed Decision Making (pp. 1–25). Academic Press. https://doi.org/10.1016/B978-0-12-812098-9.00001-2