Completed-intention aftereffects

Imagine you have already posted a letter, but passing a postbox brings the errand back to mind. What prevents a finished plan from becoming an instruction again? Researchers ask why reminders can interrupt us after an action is completed, and why they sometimes prompt a mistaken repeat.[1]

Imagine finishing a letter-posting errand and later noticing a postbox. The old plan may come to mind even though it is no longer appropriate to carry it out. What separates remembering a completed intention from repeating its action?

Laboratory tasks make that distinction measurable. Participants first perform an action when a particular cue appears, then are told the intention is finished. An old cue can slow another task without triggering the old action; this is interference. Performing the obsolete response is a commission error. The two outcomes need not share one cause.

A 2026 behavioral study examines emotional and task conditions. Its proposed resource mediation means an explanation through changes in available mental capacity, which the study did not measure directly. Brain-signal studies also record event-related potentials, or ERP: electrical activity averaged around the cue. A lingering signal can constrain accounts of processing without identifying the cause of a mistaken repeat. These signals also have limited ability to locate where activity is generated.[1] [2] [3]

Old reminders can slow a new task even when the person does not repeat the finished action. Researchers also measure mistaken repeats, which are a different outcome. Studies identify conditions that change these effects, but do not yet establish how retrieving the memory and controlling the action interact.[1] [2] [3]

Behavioral effects do not directly establish the proposed resource mediation; Experiment 2’s commission-error differences were nonsignificant. ERP task and spatial-resolution limits prevent a general causal account of deactivation or re-execution.[2] [3]

A useful memory of what you have done must coexist with the ability to stop doing it. Remembering that you posted the letter is valuable; treating that memory as an unfinished instruction could make you repeat the errand. Explaining the separation would clarify how a correct memory can still lead to an inappropriate action.[1]

Simply erasing every finished intention would lose a record of what happened, while leaving it ready to execute could produce repetitions. The useful distinction is between retaining an action in memory and giving it current authority over behavior. A causal account would show whether an obsolete reminder causes trouble by capturing attention, releasing an old response, or both; those are different ways that accurate memory can conflict with an appropriate next action.[1]