Mediodorsal Thalamic Lesions Impair Long-Term Visual Associative Memory in Macaques.

Six cynomolgus monkeys (Macaca fascicularis) were trained to associate visual stimuli with the delivery of various amounts of food reward. The animals had to choose correctly between pairs of stimuli drawn from a population of 16. Four of these stimuli were associated with 0 reward pellets, four wit...