Strong mnemonic prediction errors increase cognitive control, attention, and arousal
Ongoing experience is continuously processed in the context of past events. Divergence between current experience and memory-based predictions (i.e., a mnemonic prediction error; MPE) is theorized to be a signal that encoding, as opposed to retrieval, should be prioritized. We asked how MPEs place demands on control and attention-related processes, and whether these demands differ as a function…
Recent research reveals how strong deviations between current experiences and memory-based predictions impact cognitive functions such as control, attention, and arousal. In a study involving 101 young adult participants, researchers recorded their scalp electroencephalography and pupillometry responses while they engaged in an associative memory task. The findings indicate that larger discrepancies between expectations and reality, known as mnemonic prediction errors (MPEs), trigger significant physiological responses.
Strong MPEs led to heightened activity in the frontal theta brainwaves, which are associated with cognitive control. This suggests that the brain prioritizes encoding information rather than retrieval when faced with unexpected events. Additionally, strong MPEs were linked to increased attention, indicated by greater posterior alpha waves and pupil size. Arousal levels also rose, as measured by pupil size, further emphasizing the brain's heightened state of alertness in response to significant prediction violations.
The study concludes that these multiple physiological pathways demonstrate the brain's adaptive response to challenges to its predictions. By prioritizing control and attention mechanisms during strong MPEs, the brain optimizes learning, particularly of unexpected stimuli. These insights underscore the sophisticated mechanisms the mind employs to maintain cognitive integrity and adapt to an ever-changing environment.
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