Related Experiment Videos
Spatial memory deficits in patients with lesions affecting the medial temporal neocortex
C J Ploner1, B M Gaymard, N Ehrlé
1INSERM U 289, Hôpital de la Salpêtière, Paris, France.
Annals of Neurology
|March 11, 1999
Summary
The medial temporal neocortex, not just the hippocampus, supports spatial memory in humans. This region is crucial for recalling spatial information over longer delays.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Medial temporal lobe (MTL) subregions are implicated in memory.
- Neocortical MTL regions may have functions independent of the hippocampal formation.
Purpose of the Study:
- Investigate differential contributions of human MTL subregions to spatial memory.
- Examine the role of the medial temporal neocortex in spatial memory.
Main Methods:
- Recorded memory-guided saccades in patients with postsurgical MTL lesions (hippocampal or hippocampal + neocortical) and controls.
- Used unpredictably varied memorization delays up to 30 seconds.
- Analyzed saccadic targeting errors.
Main Results:
- Patients with selective hippocampal lesions showed no difference from controls.
- Patients with additional neocortical involvement exhibited increased saccadic targeting errors at delays >20 seconds.
- Errors were contralaterally pronounced in patients with neocortical lesions.
Conclusions:
- The human medial temporal neocortex contributes to spatial memory independently of the hippocampal formation.
- This neocortical function is distinct from spatial short-term memory.