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In Experiment 1, rats were tested in a plus-maze, with or without small ledges on the open arms, after injection with vehicle or chlordiazepoxide (7.5 mg/kg). They were scored either on their first or second exposure to the maze; those scored on trail 2 had received a 5-min undrugged exposure to the maze 24 h earlier. This dose of chlordiazepoxide had a(More)
This experiment explored sex differences in behaviour using factor analysis to describe the relationship between different behavioral variables. A principal component solution with an orthogonal rotation of the factor matrix was used, ensuring that the extracted factors are independent of one another, and thus reflect separate processes. In the elevated(More)
The effects of chronic corticosterone treatment (100 mg pellet implanted for 1 week) were assessed in animal tests of anxiety, exploration and motor activity, and changes in binding to 5-HT1A and 5-HT2A receptors, and the 5-HT transporter, were measured. At the end of the week's treatment, the corticosterone concentration was significantly elevated and(More)
Acute treatment with diazepam (2 mg/kg) decreased locomotor activity, rearing, and the number of head dips made in a holeboard. After 3 days of diazepam treatment, tolerance developed to the decreases in locomotor activity and the number of head dips, and there was an emergence of an increased time spent head dipping, compared with controls. Two days of(More)
The N-methyl D-aspartate receptor complex is involved in the mechanism of long-term potentiation, which is thought to be the biological basis of learning and memory. This complex can be manipulated in a number of ways, one of which is through the strychnine-insensitive glycine receptor coagonist site. The effects of Bioglycin(Konapharma, Pratteln,(More)
Acute administration of diazepam (2 mg/kg i.p.) to rats decreased the number of head-dips, locomotor activity and the number of rears made in the holeboard apparatus, indicating sedative effects. After daily treatment for 7 days with diazepam (2 mg/kg) tolerance developed to all these behavioural effects, despite serum concentrations of diazepam and(More)
Rats housed in conditions of noise stress were given daily injections of diazepam (4 mg/kg). Significant tolerance developed to the sedative effects within 5 days of treatment, as measured by head dipping and motor activity in the holeboard and by the number of closed arm entries in the plus-maze. These results are in agreement with other reports of rapid(More)
The purpose of this experiment was to compare, in three tasks of attention, the impairment caused by lorazepam (1 and 2.5 mg) administered to young volunteers with the impairment that results from aging. Performance on digit cancellation (DC), digit-symbol substitution (DSS), and Paced Auditory Serial Addition Task (PASAT) was significantly impaired by(More)
The non-competitive NMDA receptor antagonist, dizocilpine (0.25 mg/kg), has previously been shown to block the development of tolerance to the sedative effects of diazepam (2 mg/kg). Since there is considerable evidence that different mechanisms underlie the development of tolerance to the sedative and anxiolytic effects of diazepam, the present experiment(More)
The effects of exposure to chronic noise and vibration, produced by construction work, on the release and uptake of [3H]5-hydroxytryptamine ([3H]5-HT) and [14C]gamma-aminobutyric acid ([14C]GABA) from rat amygdaloid and hippocampal slices were investigated. Noise-exposure resulted in increased release, with no significant change in uptake, of [14C]GABA from(More)