title: Dopamine-sensitive alternation and collateral behaviour in a Y-maze: effects of d-amphetamine and haloperidol creator: Oades, R.D. creator: Taghzouti, K. creator: Simon, H. creator: Le Moal, M. subject: Behavioral Neuroscience subject: Behavioral Biology subject: Neuropharmacology subject: Physiological Psychology subject: Psychobiology description: Introduction: The frequency of spontaneous alternation in a Y-maze (visiting each arm in turn at p>50%) depends on the influence of the attention given to intra- and extra-maze cues. We examined the observing responses shown by rats (collateral rearing and head-turning behaviour), the habituation to the novelty and alternation responses over 15 minutes/day, four days in a row - in a Y-maze under enhanced and reduced dopamine (DA) activity (amphetamine- and haloperidol treatment). Methods: Prior to placement in a Y-maze for 15 minutes observation on 4 successive days animals were treated with either amphetamine (0.5 or 2.5 mg/kg) or pre-treated with a low dose of haloperidol (0.08 mg/kg, ip). Results: 1/ Amphetamine treated animals chose the arms at random on day 1, but after the higher dose on day 2-4 they perseverated their choice. The controls maintained their alternation over this period. 2/ The amphetamine-induced effects on alternation were prevented by prior treatment with the neuroleptic haloperidol. 3/ Amphetamine treatment increased the frequency of rearing in the middle at the choice point of the Y-maze. Haloperidol pre-treatment blocked this increase at the midpoint on day 1, and blocked the rearing behavior at the end of an arm on day 2. 4/ Amphetamine also increased the frequency of head turning and "looking", - an effect that was also prevented by haloperidol. (day 2 onwards). 5/ Haloperidol increased the duration of" looking" and of rearing at the end of an arm later in testing.. Conclusions: Two effects are postulated to have occurred. a) a conflict on day 1 between the novelty-controlled sensory or attentional effects, that leads to an alternation of arm-choice, and amphetamine-induced DA activity that facilitates an alternation of behavioural responses: -- the result was random choice and increased rearing at the choice point. b) On days 2-4 the drug-induced effects on switching motor responses came to control behaviour publisher: Springer-Verlag date: 1985 type: Journal (Paginated) type: PeerReviewed format: application/pdf identifier: http://cogprints.org/1435/2/rat-amph-85.pdf identifier: Oades, R.D. and Taghzouti, K. and Simon, H. and Le Moal, M. (1985) Dopamine-sensitive alternation and collateral behaviour in a Y-maze: effects of d-amphetamine and haloperidol. [Journal (Paginated)] relation: http://cogprints.org/1435/