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Confabulators mistake multiplicity for uniqueness.

Mara Serra1, Valentina La Corte2, Raffaella Migliaccio2

  • 1Institut du Cerveau et de la Moelle Epinière (ICM), Université Pierre et Marie Curie-Paris6, INSERM U 975, CNRS UMR 7225, Hôpital de La Pitié-Salpêtrière, Paris, France; Dipartimento di Scienze della Vita, Università degli Studi di Trieste, Trieste, Italy.

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Summary

Confabulating patients with organic amnesia confuse repeated events (multiplicity) with unique memories. This memory error, mistaking multiplicity for uniqueness, contributes to confabulation production in amnesia.

Keywords:
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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Confabulation is a symptom in organic amnesia, involving unintentional production of incongruous statements or actions.
  • Patients with confabulation often report habitual or routine events as unique personal memories (Habits Confabulations).
  • Habits and routines are characterized by multiplicity, contrasting with the uniqueness of specific events.

Purpose of the Study:

  • To investigate the phenomenon of confabulators mistaking multiplicity (repeated events) for uniqueness (specific temporo-spatial context).
  • To experimentally measure the ability of confabulators to discriminate between unique and repeated events.

Main Methods:

  • Utilized a recognition memory task with four runs.
  • Included items presented once (unique) and items presented four times (repeated) during the study phase.
  • Compared performance of confabulators and non-confabulating amnesiacs (NCA).

Main Results:

  • Confabulators, unlike NCAs, incorrectly identified repeated items as unique.
  • This demonstrates a tendency for confabulators to mistake multiplicity for uniqueness.
  • The study provides the first experimental evidence for this phenomenon in confabulation.

Conclusions:

  • A key mechanism in confabulation production may be the confusion between unique and repeated events.
  • This experimental finding supports the clinical observation of 'Habits Confabulations'.