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Related Experiment Videos

Knowing "what" and knowing "when".

Daniel Tranel1, Robert D Jones

  • 1Department of Neurology, Division of Cognitive Neuroscience, University of Iowa College of Medicine, Iowa City, IA 52242, USA. daniel-tranel@uiowa.edu

Journal of Clinical and Experimental Neuropsychology
|February 2, 2006
PubMed
Summary
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Patients with basal forebrain damage struggle to place autobiographical memories on a life timeline. This suggests the basal forebrain is crucial for knowing "when" events occurred, distinct from memory content retrieval.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Memory Research

Background:

  • Accurate temporal placement of autobiographical memories is a poorly understood aspect of retrograde memory.
  • Previous systematic studies on memory chronology and its neural correlates are limited.
  • The role of specific brain structures in dating personal events remains largely unexplored.

Purpose of the Study:

  • To investigate the hypothesis that basal forebrain damage impairs the ability to place autobiographical memories on a life timeline.
  • To examine the neural basis of temporal sequencing in autobiographical memory.
  • To explore the dissociation between memory content retrieval and temporal placement.

Main Methods:

  • A time-placement task was administered to assess autobiographical memory chronology.

Related Experiment Videos

  • Participants included patients with basal forebrain damage, medial temporal lobe damage, other brain-damaged controls, and healthy controls.
  • Performance was compared across groups to identify deficits in temporal ordering of personal events.

    • Main Results:

    • The basal forebrain group exhibited significant impairment in placing autobiographical memories on a timeline, misplacing events by over five years on average.
    • While the basal forebrain group also showed some memory content retrieval deficits, they did not differ from the medial temporal lobe group in this aspect.
    • The medial temporal lobe group did not show impairments in the temporal placement of memories.

    Conclusions:

    • The basal forebrain plays a critical role in the ability to accurately date autobiographical memories ('knowing when').
    • A dissociation exists between retrieving memory content ('knowing what') and its temporal context ('knowing when').
    • Findings support the basal forebrain's involvement in memory retrieval strategies essential for chronological ordering, contrasting with the medial temporal lobe's role in relational memory.