A complex seasonal rhythm controlled by photoperiod

Randall, Walter

doi:10.1007/bf00605741

Cited by 17 publications

(11 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, even the grooming scratch reflex in the spinal dog was found to vary: Sherrington (1906, p. 30) reported that both the threshold for eliciting the scratch reflex and the size of the receptive field of the scratch reflex varied with time. Our studies in cats with pontile lesions (Randall, 1981) indicate a seasonal variation in the size of the receptive field that is controlled by photoperiod, the duration of light in a day.…”

mentioning

confidence: 61%

Mediation of the photoperiodic effect on grooming reflexes by glucocorticoid hormones and serotonin.

Johnson¹,

Randall²

1983

Behavioral Neuroscience

Self Cite

View full text Add to dashboard Cite

The role of serotonin and glucocorticoid hormones in the mediation of the effect of photoperiod on the size of the receptive field for grooming reflexes was determined in cats with pontile lesions. Nineteen adult male cats with pontile lesions were used to form four groups. One group of cats with pontile lesions was adrenalectomized, another group received 5,7-dihydroxytryptamine injections in the superior colliculi, and the other two groups of cats with pontile lesions were used to provide the baseline response to photoperiod. Then, for all four groups, the receptive fields for the grooming bite, lick, and scratch reflexes were determined under different photoperiods. Both adrenalectomy and 5,7-DHT treatment blocked the effect of photoperiod. After the photoperiodic manipulations, the efficacy of intramuscular injections of hydrocortisone and 5-hydroxytryptophan in abolishing the receptive fields was demonstrated. The data indicate a modulatory effect of serotonergic neurons on the photoperiodic regulation of glucocorticoid hormones. Comparisons of this study with previous photoperiodic studies established that a complex seasonal rhythm exists which is controlled by the annual rhythm in photoperiod.

show abstract

mentioning

confidence: 61%

Mediation of the photoperiodic effect on grooming reflexes by glucocorticoid hormones and serotonin.

Johnson¹,

Randall²

1983

Behavioral Neuroscience

Self Cite

View full text Add to dashboard Cite

show abstract

“…In situ measurements of the magnetosphere and the solar wind support the earlier geometric theories on the mechanisms of the semiannual pattern: the magnetic axes of sun and earth are inclined to the earth-sun line, with the inclination of the earth's magnetic axis the major factor in generating the semiannual variation; the angle of incidence of the incoming solar wind is approximately the same at equinoxes, changing gradually to a different geometry at solstices [Holzer and Slavin, 19821. Longitudinal plots of the average monthly values of K-derived indices typically exhibit equinoctial peaks and solsticial troughs [e.g., Chapman and Bartels, 19841. In addition, Fourier analyses of these indices have established the presence of a prominent six-month period [e.g., Delouis Mayaud, 19751. Our research with the domestic cat revealed a multimodal behavioral rhythm during the interval of a year [Randall, 1981;Johnson and Randall, 19881, and our subsequent inquiries have led to the consideration of other multimodal rhythms and to the search for multimodal environmental variables. The semiannual variation in magnetic disturbances is the most prominent and well-established multimodal environmental variable.…”

mentioning

confidence: 78%

The solar wind and hallucinations—A possible relation due to magnetic disturbances

Randall

1991

Bioelectromagnetics

Self Cite

View full text Add to dashboard Cite

Data from the 19th century on hallucinations and magnetic disturbances were found to exhibit a direct and statistically significant correlation. The aa magnetic index over the period 1868-89 and concurrent visual hallucinatory activity were found to co-vary (Spearman coefficient = .64; P less than .05). Magnetic influences on the pineal hormone, melatonin, are suggested as a possible source of variation.

show abstract

“…In natural conditions, the animal shows a long seasonal anoestrus from September to January which leads to a decreased production of kittens or embryos in the autumn and at the onset of winter. This seasonal anoestrus is induced by decreasing hours of daylight, showing the cat to be sensitive to a photoperiod (Dawson, 1941;Scott & Lloyd Jacob, 1959;Hurni, 1975Hurni, , 1981Randall, 1981;Leyva et al, 1989). Social stimuli from either an oestral female or a male also influence oestrus induction.…”

Section: Abstract: Induction Of Oestrus; Light Photoperiod; Male Effementioning

confidence: 99%

Induction of oestrus in cats by photoperiodic manipulations and social stimuli

Michel

1993

Lab Anim

View full text Add to dashboard Cite

SummaryThe development of the nervous system can be studied only if the age of the embryo is exactly known. Since it is difficult to control reproduction in female cats, we tried to time fertilization very precisely to within one hour by using either artificial insemination, or by mating females in oestrus induced by light programming.In one trial, this programming was associated with male or female stimuli according to the work of McClintock (1971McClintock ( , 1978McClintock ( , 1984 and Preti et al. (1986).

show abstract

A complex seasonal rhythm controlled by photoperiod

Cited by 17 publications

References 26 publications

Mediation of the photoperiodic effect on grooming reflexes by glucocorticoid hormones and serotonin.

Mediation of the photoperiodic effect on grooming reflexes by glucocorticoid hormones and serotonin.

The solar wind and hallucinations—A possible relation due to magnetic disturbances

Induction of oestrus in cats by photoperiodic manipulations and social stimuli

Contact Info

Product

Resources

About