Unexpected Twists: Electrophysiological Correlates of Encoding and
Retrieval of Events eliciting Prediction Error
Abstract
The human brain is postulated to function as a prediction machine,
constantly comparing incoming sensory input to predictions based on past
experiences. When an event contradicts these predictions, it results in
a prediction error (PE), which has been shown to enhance subsequent
memory. However, the neural mechanisms underlying the influence of PE on
subsequent memory remain unclear. This study investigated the
electrophysiological correlates during encoding and retrieval of events
eliciting PE. We employed a statistical learning task in which
participants were presented with pairs of objects in sequence.
Subsequently, while recording electroencephalography (EEG), we
introduced PE by replacing the second object of each pair with new
objects and we then tested the participants’ memory. Behaviorally, PE
did not enhance memory. During retrieval, we observed higher amplitudes
of the posterior recollection component for violation items that were
remembered compared to those that were forgotten. In contrast, no
evidence for the presence of the frontal negative familiarity component
was found. These results suggest that recollection, but not familiarity,
plays a crucial role in the interplay between PE and memory. Contrary to
our hypothesis, we did not observe a relationship between PE and the P3
component during encoding. In conclusion, our study contributes to the
growing body of knowledge concerning the intricate relationship between
PE and episodic memory. It sheds light on the underlying neural
mechanisms involved and emphasizes the importance of recollection in
this context.