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Catherine de Bournonville, Jacques Balthazart, Gregory F Ball, Charlotte A Cornil
Although aromatase is expressed in both male and female brains, its functional significance in females remains poorly understood. In female quail, sexual receptivity is activated by estrogens. However it is not known whether sexual motivation is similarly estrogen-dependent and whether estrogens locally produced in the brain contribute to these behavioral responses. Four main experiments were designed to address these questions. In Experiment 1 chronic treatment of females with the anti-estrogen tamoxifen decreased their receptivity, confirming that this response is under the control of estrogens...
July 2016: Hormones and Behavior
Bernard Cohen, Mingjia Dai, Sergei B Yakushin, Theodore Raphan
Reduction of the dominant time constant (T(VOR)) of the angular vestibulo-ocular reflex (aVOR) by habituation is associated with a decrease in motion sickness susceptibility. Baclofen, a GABA(b) agonist, reduces the time constant of the velocity storage integrator in the aVOR in a dose-dependent manner. The high frequency aVOR gain is unaltered by baclofen. Here we demonstrate that the reduction in T(VOR) produced by oral administration of 20 mg of baclofen causes a significant reduction in motion sickness susceptibility, tested with roll while rotating (RWR)...
2008: Progress in Brain Research
Mingjia Dai, Theodore Raphan, Bernard Cohen
The purpose of this study was to determine the effect of baclofen, a GABA(B) agonist on the angular vestibulo-ocular reflex (aVOR). Model studies have shown that the aVOR comprises a "direct" pathway, which determines its high frequency gain g (1), and an indirect "velocity storage" pathway, which determines its low frequency characteristics. Velocity storage can be characterized by an integrator with a dominant time constant, T (VOR), and a gain g (0) that couples afferent information from the semicircular canals to the integrator...
May 2006: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
M Taziaux, C A Cornil, J Balthazart
In Japanese quail (Coturnix japonica), activation of appetitive and consummatory aspects of male sexual behavior requires aromatization of testosterone (T) into estrogens. Appetitive male sexual behavior (ASB) is usually assessed with the use of a learned social proximity procedure. In the present experiment, we investigated the role of estrogens in the activation of an another index of ASB, the female-induced activation of rhythmic cloacal sphincter movements (RCSMs) that are produced in reaction to the visual presentation of a female...
November 30, 2004: Behavioural Processes
S Bello, G D Paige, S M Highstein
The vestibulo-ocular reflex (VOR) was studied in adult squirrel monkeys before and after adaptation to magnifying and minifying viewing conditions. Monkeys were subjected to broadband (0.05-0.71 Hz) conditioning rotation for six hours in head yaw, pitch, and roll on separate occasions, and the VORs in these three planes were studied in darkness to assess adaptive plasticity in the reflexes. The gain of the horizontal VOR (H-VOR) averaged 0.8 across the frequency bandwidth studied (0.025-4 Hz). Phase was near 0 degrees from 4 to around 0...
1991: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
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