Naslov
Violation of expectations in sequence processing

Autori
Bubić, Andreja ; Schubotz, Ricarda I. ; Schroeger, Erich

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
20. Dani Ramira i Zorana Bujasa / - , 2011

Skup
20. Dani Ramira i Zorana Bujasa

Mjesto i datum
Zagreb, Hrvatska, 04.2011

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
deviant detection; prediction; sequence processing

Sažetak
The importance of formulating predictions has long been recognized within different brain systems and cognitive domains, including the processing of structured patterns of perceptual stimuli, i.e., perceptual sequences. In addition, however, it is important to study breaches of the postulated expectations and the detection of deviant or unpredicted events, as these may trigger cognitive and behavioural adjustments and guide future learning. The two experiments presented here address this issue by exploring and comparing the neural correlates of detecting sequential deviations, i.e., violations in the order of the presented stimuli, and feature (non-sequential) deviants that violate the perceptual context of the presented stimuli. To this end, we used the serial prediction task, in which the participants were required to extract and predict a repetitive sensory pattern, and indicate whether a sequential violation occurred in the last part of the trial or not. In addition, a control, non-sequencing task was used, in which the participants were required to detect feature deviants. The results obtained in Experiment 1, which employed functional magnetic resonance imaging (fMRI), showed that sequential deviants triggered an increase of activity in lateral and mesial premotor, prefrontal and cerebellar areas. In contrast, feature deviants triggered primarily bilateral activations within parietal and posterior temporal areas with a more restricted involvement of prefrontal cortices. Exploring the temporal dynamics of detecting two deviant types using electroencephalography (EEG) in Experiment 2 revealed that both sequential and feature deviants elicited N2b and P3b event-related potential (ERP) components, albeit of different latencies and topographies. In addition, only feature deviants elicited an N1 ERP component. These results indicate substantial differences both in the temporal dynamics and brain networks supporting deviant detection in the two contexts.

Izvorni jezik
Engleski

Znanstvena područja
Psihologija

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