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Event boundaries shape temporal organization of memory by resetting temporal context.

Yi Pu1, Xiang-Zhen Kong2, Charan Ranganath3,4

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Event boundaries in memory have a dual role, improving temporal order memory (TOM) within events and impairing it across events. Shorter events enhance TOM, especially for early items, explained by a context drift-reset model.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Computational Modeling

Background:

  • Continuous experiences are segmented into discrete events in memory.
  • Event boundaries are known to influence memory's temporal organization.
  • The precise mechanisms by which event boundaries shape temporal order memory (TOM) are not fully understood.

Purpose of the Study:

  • To investigate the dual role of event boundaries on temporal order memory (TOM).
  • To explore how event length and position influence TOM.
  • To develop a computational model explaining the effects of event boundaries on TOM.

Main Methods:

  • Four behavioral experiments were conducted to assess TOM under varying event structures.
  • Participants' memory for item order was tested across different event lengths and positions.
  • A computational model simulating temporal context drift and reset at event boundaries was developed.

Main Results:

  • Event boundaries were found to improve TOM for items within an event but impair TOM for items across events.
  • Decreasing event length enhanced TOM, particularly for items in earlier positions within an event (local primacy effect).
  • The computational model successfully replicated all observed behavioral results.

Conclusions:

  • Event boundaries play a dual role in shaping temporal order memory.
  • A unified algorithmic mechanism involving temporal context drift and reset at boundaries explains these effects.
  • This reconciles paradoxes regarding how both contextual similarity and dissimilarity can promote TOM.