AI Article Synopsis
- The study investigates how unexpected outcomes from voluntary actions, such as choosing TV programs, affect brain responses, specifically the late positive potential (LPP).
- Twelve student volunteers participated in trials that involved selecting from different types of cues, including image and text categories, to simulate expectations.
- Results indicated that when the outcome did not match expectations, participants displayed a larger LPP with image and text cues, and a distinct P3 response with images, highlighting how we process mismatches between our expectations and outcomes.
Article Abstract
When a voluntary action is followed by an unexpected stimulus, a late positive potential (LPP) with a posterior scalp distribution is elicited in a latency range of 500-700 ms. In the present study, we examined what type of mismatch between expectations and action outcomes was reflected by the LPP. Twelve student volunteers participated in a task simulating choice of TV programs. After choosing one of three options displayed as a cue stimulus, they viewed a second stimulus (still TV image). To manipulate the type of expectation, three kinds of cue conditions were used: thumbnail image condition (three small TV images), category label condition (three words), and no cue condition (three question marks). Over trials, the second stimulus either matched (p = .80) or mismatched (p = .20) the chosen option. As compared to matched TV images, mismatched TV images elicited a larger LPP (500-700 ms) in the thumbnail image and category label conditions. In addition, a larger centroparietal P3 (400-450 ms) was elicited to mismatched TV images in the thumbnail image condition alone. LPP reflects a conceptual mismatch between a category-based expectation and an ensuing action outcome, whereas P3 reflects a perceptual mismatch between an image-based expectation and an action outcome.
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| http://dx.doi.org/10.1007/s10484-011-9157-y | DOI Listing |
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