Behavioral reinforcement of long-term potentiation is impaired in aged rats with cognitive deficiencies.
Behavioral stimuli with emotional/motivational content can reinforce long-term potentiation in the dentate gyrus, if presented within a distinct time window. A similar effect can be obtained by stimulating the basolateral amygdala, a limbic structure related to emotions. We have previously shown that aging impairs amygdala-hippocampus interactions during long-term potentiation. In this report we show that behavioral reinforcement of long-term potentiation is also impaired in aged rats with cognitive deficits. While among young water-deprived animals drinking 15 min after induction of long-term potentiation leads to a significant prolongation of potentiation, cognitively impaired aged rats are devoid of such reinforcing effects. In contrast, a slight but statistically significant depression develops after drinking in this group of animals. We suggest that an impaired mechanism of emotional/motivational reinforcement of synaptic plasticity might be functionally related to the cognitive deficits shown by aged animals.
Bergado
J A
JA
International Center for Neurological Restoration (CIREN), La Habana, Cuba.
Almaguer
W
W
Ravelo
J
J
Rosillo
J C
JC
Frey
J U
JU
D000375:Aging / Q000502:physiology* / Q000523:psychology*; D000818:Animals; D001522:Behavior, Animal; D003072:Cognition Disorders / Q000503:physiopathology* / Q000523:psychology*; D004326:Drinking / Q000502:physiology; D017774:Long-Term Potentiation; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012054:Reinforcement, Psychology; D014868:Water Deprivation / Q000502:physiology