Delayed alternation performance following subchronic phencyclidine administration in rats depends on task parameters

Area of Science:

• Neuroscience
• Cognitive Psychology
• Pharmacology

Background:

• The cognitive effects of subchronic phencyclidine (PCP) administration remain unclear in scientific literature.
• Discrepancies in findings may stem from variations in drug treatment protocols and experimental task parameters.

Purpose of the Study:

• To investigate if procedural differences in the delayed T-maze alternation task affect performance after identical PCP treatments.
• To reconcile conflicting research findings on PCP's functional outcomes by examining task parameter influence.

Main Methods:

• Two groups of rats (n=16 each) were trained on either a continuous or discrete trials version of the T-maze alternation task.
• Following training, rats received daily intraperitoneal injections of PCP (10 mg/kg) or saline for 14 days.
• Subjects were tested on their respective T-maze versions 48 hours after the final injection.

Main Results:

• Rats treated with PCP demonstrated significant impairment in the continuous alternation task compared to saline controls.
• No significant performance difference was observed between PCP-treated and saline groups in the discrete trials version of the task.
• These findings suggest PCP's detrimental effects on cognitive control may be task-dependent.

Conclusions:

• Task procedural variations, specifically continuous versus discrete trials, critically influence the manifestation of PCP-induced cognitive deficits.
• PCP exposure may damage cognitive control mechanisms involving the prefrontal cortex and/or striatal response-related processes.
• Systematic analysis of task parameters is essential for resolving inconsistencies in the study of PCP's cognitive effects.