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Area of Science:

  • Cognitive Neuroscience
  • Memory Research
  • Human Electrophysiology

Background:

  • Ongoing experience is interpreted through past events.
  • Mnemonic prediction errors (MPEs) signal the hippocampus to prioritize encoding over retrieval.

Purpose of the Study:

  • Investigate cognitive and neural demands of MPEs beyond the hippocampus.
  • Examine how prediction strength influences these demands.

Main Methods:

  • Two experiments involving 101 young adults.
  • Recorded scalp electroencephalography (EEG) and pupillometry during an associative memory task.

Main Results:

  • Strong MPEs increased physiological markers of cognitive control (frontal theta), attention (posterior alpha, pupil size), and arousal (pupil size).
  • Pupil-linked MPE responses correlated with attention (posterior alpha) during prediction.
  • Enhanced cognitive control (frontal theta) during strong MPEs improved learning of unexpected stimuli.

Conclusions:

  • The brain and mind adaptively respond to violations of strong mnemonic predictions.
  • MPEs engage broader cognitive and neural resources, modulated by prediction strength.