An air pressure operated commutator system for electrical brain stimulation in a fighting rat☆

Kruk, Menno R.; Kuiper, Patricia; Meelis, W.

doi:10.1016/0031-9384(78)90286-x

Cited by 16 publications

(1 citation statement)

References 2 publications

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“…Standard 2-min test stimulation periods (Lammers et al, 1987) were given in a 100-cm × 60-cm × 50-cm test cage. Details on experimental setup and stimulation equipment can be found elsewhere (Kruk, Kuiper, & Meelis, 1978; Kruk et al, 1979; Lammers et al, 1987). No goal objects other than the partner were available in the test cage.…”

Section: Methodsmentioning

confidence: 99%

Interactions between simultaneously activated behavioral systems in the rat.

Lammers¹,

Noordaa²,

Kruk³

et al. 1989

Behavioral Neuroscience

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Interactions between electrically induced attack and teeth-chattering from 1 electrode and grooming from another were examined in male albino rats. The interaction between electrically induced attack and deprivation-induced feeding, as well as the effect of food deprivation on attack, was also studied. Results indicate that attack appears to be a dominant response, for it suppressed grooming and feeding at a low level of activation. On the other hand, it was not affected by simultaneously induced grooming or feeding. However, food deprivation decreased the threshold for attack, leaving attack latency, attack form, or bite targets unaffected. Teeth-chattering, suggested to be related to attack and flight, was also a dominant response. Results suggest that interactions between behavioral systems are in favor of the systems that must act acutely on activation in order to survive. Apparently, the regulations governing these interactions are represented in the functional organization of the brain.

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Section: Methodsmentioning

confidence: 99%

Interactions between simultaneously activated behavioral systems in the rat.

Lammers¹,

Noordaa²,

Kruk³

et al. 1989

Behavioral Neuroscience

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Effects of midbrain central gray lesions on spontaneous and electrically induced aggression in the rat

Lammers¹,

Poel²,

Bermond³

et al. 1983

Aggr. Behav.

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Large electrolytic lesions were placed in the midbrain central gray of male rats. Their effects on hypothalamically induced aggression, switch‐off behaviour, and locomotion were investigated. A number of these animals were also tested for territorial intermale aggression in order to compare electrically induced and spontaneous aggression. Large lesions resulted in an increase of the current threshold to induce aggression by hypo‐thalamic stimulation. Smaller, but still quite large, lesions decreased the threshold current for hypothalamic aggression. After the operation a decrease in the threshold for switch‐off was present, both in the experimental and the control group. Current thresholds for locomotion were decreased after the lesions only in the experimental group. Spontaneous aggression was temporarily decreased after the lesion. No indication was found that other behavioural elements of the animal were distorted by the lesion. The parallel between the effects on spontaneous and electrically induced aggression makes it attractive to ascribe a role to the neural circuit of hypothalamus and central gray in territorial aggression. However, even with large lesions the animals were still capable of fighting, hence the central gray is not indispensable. An attempt was made to explain the differential effects that differently sized central gray lesions have on hypothalamic aggression.

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