Abstract:
:Imprinting in chicks is a form of juvenile learning that has been used to study the basic cellular mechanisms of learning and memory. The forebrain area mediorostral neostriatum/hyperstriatum ventrale (MNH) is a center for acoustic imprinting. Electrophysiological and pharmacological behavioral studies in the MNH have demonstrated that the glutamatergic system and the associated receptors are critically involved in auditory filial imprinting. Accordingly, we investigated the hypothesis that stimulus-evoked glutamate release may be altered after this learning process. Using an in vivo microdialysis technique, we observed a significantly higher increase of extracellular glutamate level in tone-imprinted chicks during exposure to the previously imprinted tone than in socially imprinted control chicks. In a further series of experiments, where we exposed animals from both experimental groups to handling distress, glutamate levels in MNH showed only a slight increase, whereas we observed a pronounced increase of extracellular glutamate in the lobus parolfactorius (LPO), the avian analogue of the basal ganglia. No difference of distress-evoked glutamate release was found in MNH and LPO between tone-imprinted and socially imprinted chicks. The tone-evoked enhanced glutamate response in tone-imprinted chicks suggests that during auditory imprinting glutamatergic synapses develop the potential to increase transmitter release in response to the imprinting stimulus.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Gruss M,Braun Kdoi
10.1046/j.1471-4159.1996.66031167.xsubject
Has Abstractpub_date
1996-03-01 00:00:00pages
1167-73issue
3eissn
0022-3042issn
1471-4159journal_volume
66pub_type
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