Spatial conditional associative learning: effects of thalamo-hippocampal disconnection in rats.
Unilateral lesions to the anterior thalamic nuclei (ATN) and the hippocampus (H) were made in opposite hemispheres in the rat to examine whether these brain structures form part of a functional neural pathway underlying spatial learning and memory. In the first experiment, rats were tested on a spatial-visual conditional associative task in which they had to learn to approach one of two stimuli depending on the spatial context in which the stimuli were embedded. The rats were subsequently trained on delayed forced alternation, a spatial working memory task known to be sensitive to the effects of ATNxH damage. Rats with ATNxH lesions were impaired in the acquisition of both tasks in comparison with normal control animals. The findings support the idea that the anterior thalamic nuclei and the hippocampus are critical components of an anatomical system subserving spatial memory and suggest that these brain regions work in a dependent fashion during the performance of certain spatial learning tasks.
Henry
Jessica
J
Department of Psychology, McGill University, 1205 Dr. Penfield Ave, Montreal, Quebec, Canada H3A 1B1.
Petrides
Michael
M
St-Laurent
Marie
M
Sziklas
Viviane
V
D000704:Analysis of Variance; D000818:Animals; D020643:Anterior Thalamic Nuclei / Q000293:injuries / Q000473:pathology / Q000502:physiology*; D001245:Association Learning / Q000502:physiology*; D001522:Behavior, Animal; D003216:Conditioning, Operant / Q000502:physiology*; D018690:Excitatory Amino Acid Agonists / Q000633:toxicity; D007839:Functional Laterality; D006624:Hippocampus / Q000293:injuries / Q000473:pathology / Q000502:physiology*; D007051:Ibotenic Acid / Q000633:toxicity; D008297:Male; D008570:Memory, Short-Term; D009434:Neural Pathways / Q000293:injuries / Q000502:physiology; D051381:Rats; D013028:Space Perception / Q000502:physiology*
D018690:Excitatory Amino Acid Agonists; D007051:Ibotenic Acid