Spatial memory deficits in patients with lesions to the right hippocampus and to the right parahippocampal cortex

Veronique D. Bohbot, Miroslav Kalina, Katerina Stepankova, Natasa Spackova, Michael Petrides, Lynn Nadel

Research output: Contribution to journalArticle

395 Scopus citations

Abstract

Spatial memory tasks, performance of which is known to be sensitive to hippocampal lesions in the rat, or to medial temporal lesions in the human, were administered in order to investigate the effects of selective damage to medial temporal lobe structures of the human brain. The patients had undergone thermo-coagulation with a single electrode along the amygdalohippocampal axis in an attempt to alleviate their epilepsy. With this surgical technique, lesions to single medial temporal lobe structures can be carried out. The locations of the lesions were assessed by means of digital high-resolution magnetic resonance imaging and software allowing a 3-D reconstruction of the brain. A break in the collateral sulcus, dividing it into the anterior collateral sulcus and the posterior collateral sulcus is reported. This division may correspond to the end of the entorhinal/perirhinal cortex and the start of the parahippocampal cortex. The results confirmed the role of the right hippocampus in visuo-spatial memory tasks (object location, Rey-Osterrieth Figure with and without delay) and the left for verbal memory tasks (Rey Auditory Verbal Learning Task with delay). However, patients with lesions either to the right or to the left hippocampus were unimpaired on several memory tasks, including a spatial one, with a 30 min delay, designed to be analogous to the Morris water maze. Patients with lesions to the right parahippocampal cortex were impaired on this task with a 30 min delay, suggesting that the parahippocampal cortex itself may play an important role in spatial memory.

Original languageEnglish (US)
Pages (from-to)1217-1238
Number of pages22
JournalNeuropsychologia
Volume36
Issue number11
DOIs
StatePublished - Nov 1 1998

Keywords

  • Amnesia
  • Anterior collateral sulcus
  • Environmental agnosia
  • Hippocampus
  • Human
  • Medial temporal lobes
  • Navigation
  • Parahippocampal cortex
  • Rat
  • Spatial
  • Topographical memory

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience

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