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Results for “Competitive Behavior”

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At least 127 records · Page 7Linked to original sources
PubMed1990

Effects of intra-amygdaloid TRH injections on motor activity and dominant-submissive behavior in rats competing for water.

The effect of thyrotropin releasing hormone (TRH) microinjections into the central amygdala (10 g in 0.5 1 into each side) on locomotor activity water intake and dominance behavior in a water competition test was investigated in male Wistar rats. TRH increased the general motility without altering the number of rearings. Intra-amygdaloid TRH injection to submissive rats resulted in a loss of subordinate position in these animals in the water competition test. A tendency to decrease dominance followed the injection of the peptide to the dominant animals. The effect of TRH in the dominance test does not appear to involve influence on the thirst drive as microinjection of the peptide did not change significantly the water consumption in thirsty rats.

Amygdala↗
PubMed1991

Tonic immobility and factors influencing its duration in rats.

The author developed a method for inducing tonic immobility (paroxysmal inhibition) in rats and mice. By means of a plexiglass plate and plexiglass box the rat is immobilised, rotated at 180 degrees and subjected to constant pressure corresponding to the weight of the plexiglass plate. This way it is possible to prolong substantially tonic immobility in rats without using foregoing time consuming and interfering, so called sensitizing procedures. The duration of TI can be influenced by pharmacologic and nonpharmacological interventions. A longer duration of TI appeared to be typical for rats tending to react in other situations with anxiety, motor inhibition and submission.

Animals↗
PubMed1995

[Begging and sharing in a group of adolescent chimpanzees].

80 15-min tests using toys were carried out with 4 juvenile chimpanzees who, to obtain the toys, used 4 strategies: (1) taking by force, (2) snatching and fleeing, (3) begging, (4) hysterics. Sharing toys was a normal strategy of high-ranking animals. Begging and hysterics were mainly used in contacts with the latters. A strong negative correlation was found between hysterics and friendly behaviour.

Altruism↗
PubMedDate not supplied

[The behavioral phenomenon of "parasitism" in rats].

29 male Wistar rats had been individually trained pressing the bar and receiving the rewards in the box with the feeder-cup and the bar attached to the opposite walls. Constant pairs of rats were formed. Behavior of rats in pairs was observed during 100 sessions in the same box. As a rule, one of the rats performed most of the bar pressings ("a worker") while its partner received the rewards without "working" ("a parasite"). It was possible to classify rats in four groups by their behavior, i. e. "parasites", "working", rats which changed their behavior from "working" for "parasitic" type and vice versa in the course of the experiment, and rats from the pairs where both partners extinguished bar pressing reflex near to zero level. Correlation was shown between behavioral type of rats in paired experiment and individual typological characteristics of fear reaction to different stimuli. Tests of open field behaviour, reaction of choice between the burrow and illuminated area, and emotional resonance were used for testing fear reaction.

Animals↗
PubMed1978

Competitive social strategies in groups of deprived and experienced rhesus monkeys.

Behavior during competition for water was observed in 2 social groups of young rhesus monkeys (3 females, 3 males in each). Monkeys in one group were socially deprived and those in the other were socially experienced (raised with mother and agemates). Social status, based on dyadic recording of displacements at the water bottle, was predictive of a number of measures related to water consumption and social orientation in both groups, but this measure was less reliable and predictive for the experienced group than for the deprived groups, but this measure was less reliable and predictive for the experienced group than for the deprived group. A major reason for the comparatively low predictive value and reliability of status among experienced monkeys was their ability to influence the behavior of higher status members through responses directed to a 3rd party and other elaborate social strategies, many of which depended on responding to status relations between 2nd and 3rd parties. The fact that such strategies were only observed in the experienced group is a clear indication that the development of higher orders of social cognition is dependent on early social experience.

Animals↗
PubMed1986

The effects of clonidine on food consumption and food competition in male stumptail macaques (Macaca arctoides).

The effects of clonidine on noncompetitive and competitive feeding were examined in three adult male stumptail macaques (Macaca arctoides). Noncompetitive feeding was examined when the subjects were individually-caged or group-caged. Clonidine (1.0 mg/kg) administered IM substantially increased food consumption over control values in all subjects in both housing situations. The effects of clonidine on competitive feeding behavior were evaluated in the group-caged environment. Food competition was assessed by recording the number of chows retrieved from a common food box by each subject. Food retrieval was increased in the lowest-ranking subject when clonidine was administered to all subjects. Retrieval decreased in the middle-ranking subject and was unchanged in the highest-ranking subject. Administration of clonidine to individual subjects did not increase food retrieval. It is concluded that since the hyperphagic property of clonidine was only apparent during noncompetitive food-getting, that other drug-behavioral interactions prevented an increase in food retrieval during competitive situations.

Animals↗
PubMed1975

The effects of azaperone, a sedative neuroleptic of the butyrophenone series, on dominant-subordinate behaviour in wistar rats competing for food.

The effects of azaperone, a sedative neuroleptic of the butyrophenone series with outstanding anti-aggressive and anti-shock activity on dominant-subordinate relationship in pairs of rats, competing for food, are described. Treating the dominant rat of a pair with azaperone, a dose related weakening (at 0.16 and 0.31 mg/kg) and reversal (at 0.63 mg/kg and above) of the initial strong dominant-subordinate relationship is demonstratedmat 5 mg/kg the dominant-subordinate reversal is complete until the end of the test session. Dominant-subordinate relationships are modified by azaperone at doses far below those inducing gross behavioural changes. The present results point at a normalizing effect of azaperone on social interaction through inhibition of aggressive responsiveness.

Aggression↗