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The role of the medial prefrontal cortex of rats in short-term memory functioning: further support for involvement of cholinergic, rather than dopaminergic mechanisms.

Abstract：

:The putative involvement of the dopaminergic innervation of the medial part of the prefrontal cortex (PFC) in short-term memory functioning was investigated by evaluating the effects of local infusions of dopaminergic drugs into the ventral part of the medial PFC of rats in an operant delayed-matching-to-position (DMTP) task. Two separate groups of rats were tested after bilateral microinfusion of several doses of either the dopamine receptor agonist apomorphine (APO) or the dopamine receptor antagonist cis-flupenthixol (FLU) into the ventromedial PFC. In addition, all animals were tested after infusion of several doses of the muscarinic receptor antagonist scopolamine (SCO) and the dopamine DI receptor antagonist SCH-23390 (SCH). The drugs tested affected DMTP performance differentially. APO had no effect on response accuracy, although it dose-dependently affected nose poke activity and response latencies. FLU and SCH both induced a dose-dependent, but delay-independent deterioration of response accuracy that was paralleled by increases in response latencies and decreases in nose poke frequencies, causing some animals to stop responding after infusion of the highest doses of both drugs. In contrast, SCO infusions into the ventromedial PFC induced a dose- and delay-dependent deterioration of response accuracy, that was accompanied by an increase in response latencies only. Taken together, these results provide additional support for the involvement of cholinergic, rather than dopaminergic mechanisms in short-term memory supported by the medial PFC of the rat, and they are not in favor of a functional dissociation between the dorsomedial PFC and the ventromedial PFC in the role.

journal_name

Brain Res

journal_title

Brain research

authors

Broersen LM,Heinsbroek RP,de Bruin JP,Uylings HB,Olivier B

doi

10.1016/0006-8993(95)00025-l

subject

Has Abstract

pub_date

1995-03-20 00:00:00

pages

221-9

issue

eissn

0006-8993

issn

1872-6240

pii

0006-8993(95)00025-L

journal_volume

674

pub_type

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The role of the medial prefrontal cortex of rats in short-term memory functioning: further support for involvement of cholinergic, rather than dopaminergic mechanisms.