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Biomedical subjects

J C Roy

Publications and source records attributed to J C Roy.

At least 37 records · Page 2Linked to original sources
PubMed1984

Asymmetry of electrodermal activity: a review.

Before the seventies, with a few exceptions, electrodermal activity had been studied only unilaterally, presuming symmetry. Only in the seventies do a growing number of authors take an interest in electrodermal asymmetry, due in part to the enthusiasm evoked by theories of hemispheric specialization. The purpose of this paper is to clarify and summarize the data - often contradictory - collected on this subject and to point out some remaining problems.

Age Factors↗
PubMed1982

[The pyramidal tract is involved in the control of an autonomic response (skin potential response), in the cat (author's transl)].

On Cats paralyzed by gallamine, electrical stimulation of corticospinal fibers still evoked skin potential responses, after a transection of the medulla only sparing the pyramidal tract. These responses persisted even after aspiration of the medullary tissue posterior to the section and overlying the pyramids. These results indicate that the pyramidal tract can participate in the control of electrodermal activities, besides reticular influences that also act upon the spinal level.

Animals↗
PubMed1982

Mesencephalic and bulbar reticular control of skin potential responses in kittens.

Reticular command of Skin Potential Responses (SPRs) was investigated in 30 kittens between 1 and 30 days of age which had been acutely implanted under chloralose anaesthesia (40 mg/kg). The results show that (a) SPRs can be elicited through electrical stimulation of the mesencephalic reticular formation (MRF) in kittens as early as a few hours after birth. As in the adult cat, these SPRs consist of a monophasic negative wave. Up until the age of 10 days SPRs recorded from the forepaws are significantly larger than those from the hindpaws. There is not difference in amplitude between ipsilateral and contralateral responses, relative to the stimulation site. (b) The first of a pair of MRF stimuli is followed by a subnormal period of 50 s, during which a second MRF stimulus of the same intensity evokes SPR of lower amplitude. (c) Stimulation of certain parts of the bulbar reticular formation (BRF) inhibits the SPRs evoked through MRF stimulation. The average percentage of inhibition was 65% in 10 kittens aged from 1 to 15 days. These results suggest that the reticular centers which control electrodermal activity are functional at birth and that certain characteristics of electrodermal activity are subject to post-natal maturation.

Aging↗
PubMed1980

Reliability of spontaneous electrodermal activity in the cat as a function of waking and sleep stages.

This study was designed to examine the reliability of spontaneous electrodermal activity (EDA) as a function of the stages of sleep and waking in freely moving cats. Five adult cats were observed during waking--sleep sessions. The results show that: (a) for all stages, the reliability of EDA is slightly higher for amplitude of SSPRs than for frequency; (b) during drowsiness, a maximum of reliability is observed, as is a slight decrease during slow wave sleep; during paradoxical sleep, reliability decreases greatly to below that of the waking level; (c) the reliability of spontaneous EDA appears to be higher in waking cats than that quoted for human subjects. These results are discussed with reference to individual characteristics and state variables.

Analysis of Variance↗
PubMed1976

[Conditioning of the avoidance to the contact call in the red face lovebird (Agapornis roseicollis, Aves, Psittacidae)].

Two experiments were run on 10 lovebirds to test the reinforcing effect of the social call in an operant conditioning task. In the first experiment, the reinforced behavior (perching) which provoked the occurence of the call decreased. In the second experiment, where the same behavior stopped the continuous emission of the call, the behavior increased. This behavior may results from an avoidance to the call recorded from a lovebird which do not belong to the group of our experimental birds.

Animals↗
PubMed1975

Value of capillary blood gas analyses in the management of acute respiratory distress.

A comparative study of blood gases and acid-base parameters, obtained simultaneously from arterial and finger capillary samples, was performed in 45 patients in acute respiratory distress without circulatory shock. Although small and significant differences were found between the 2 sample pH, Po2, Pco2, and bicarbonate values, the correlations between the 2 were greater than or equal to 0.97 for each variable. It was concluded that although the arterial blood is the preferred sample for evaluation of blood gases and acid-base status of patients in acute respiratory distress, capillary blood appears to be a valid substitute in the management of these patients. This technique is particularly valuable in pediatric practice, where repeated arterial samples are less easily obtained.

Acute Disease↗