Life-span changes in the copulatory behavior of male rats (Rattus norvegicus)

The copulatory behavior of 5-, 10-, 15-, and 20-month-old sexually naive male rats (Long-Evans) was studied during 2-hr tests with receptive females. There was no apparent change in sexual arousal as measured by latency to initiate copulation across age, with subjects from all groups exhibiting comparable latencies to first mount and first mount with intromission. The numbers of ejaculations achieved were also similar across ages. Significant age differences were found for frequency of mounts, with 20-month-olds having the highest mean frequency. The persistent mounting by older males appeared to account for significant group differences in interintromission interval and ejaculation latency. It is suggested that motor deficits may impair the ability of older males to achieve intromission, increasing the number of mount bouts as well as the number of mounts per bout, thus extending the length of each copulatory series.     

Acceptance of male rape myths among college men and women

College students (157 men and 158 women; predominantly white middle class) from psychology courses at a midwestern university rated their agreement with statements reflecting myths that male rape cannot happen, involves victim blame, and is not traumatic to men. Statements varied by whether the rape perpetrator was a man or woman. Results showed that a majority of subjects disagreed with all myth statements, but most strongly with trauma myths. Percentages of disagreement with myths for subject groups ranged from 51% to 98%. Women were significantly more rejecting of rape myths than were men. Subjects were more likely to accept myths in which the rape perpetrator was female rather than male. Subjects' past victim experience with sexual coercion was not related to rape myth acceptance. Results are discussed in terms of societal attitudes toward rape and sex role stereotypes.     

Death scene characteristics in 118 fatal cases of autoerotic asphyxia compared with suicidal asphyxia

A series of 118 autoerotic asphyxial deaths, recorded by the Coroners or Medical Examiners from the Canadian provinces of Ontario and Alberta, were compared with the same number of asphyxial suicides matched by province, year of death (within 3 years) and method of asphyxiation. Comparison of the death scenes revealed major differences between the two groups, with nudity of the body, evidence of a wide range of sexual activity at the time of death, and absence of verbal or written indication of suicidal intent being characteristic of the autoerotic asphyxia group. The data indicate that autoerotic asphyxia and suicidal asphyxia can usually be readily distinguished by death scene features.     

Can You Say Condom?: It Makes a Difference in Fear-Arousing AIDS Prevention Public Service Announcements1

The study investigated the effect of adding a recommendation to use condoms to fear-arousing AIDS public service announcements (PSAs) on subjects’ intentions to use condoms and taking of free condoms. Sexual content of the AIDS PSA and subject gender were also varied. A sample of 112 men and 107 women rated the effectiveness of 1 of 8 fear-arousing AIDS PSAs. Four PSAs ended with a message to “Use condoms to reduce the risk. For more information call_____.” An identical set of PSAs ended with only the telephone number for more information. Results showed that the recommendation had no effect on intentions to use condoms. However, men exposed to a fear-arousing PSA with the recommendation took significantly more condoms than men in the no-recommendation condition. Men also took significantly more condoms than women in the recommendation condition. The results are interpreted in terms of the AIDS risk reduction model (Catania, Kegeles, & Coates, 1990).     

Psychophysiological responding as a function of age: The importance of matching

Few studies in the past which have employed psychophysiological measures have controlled for age. We have studied the effects of age on the heart rate, hand surface temperature, cephalic vasomotor response, and frontal electromyographic activity (EMG) of 73 normal individuals who varied in age from 18 to 68 years and were evenly divided into younger, middle, and older age groups. Comparisons were made between groups across eight conditions — baseline, relax body, warm hand, relax facial muscles, mental arithmetic, positive imagery, negative imagery, and cold pressor. Results indicated a direct linear relationship between age and electromyographic activity during relax facial muscles and mental arithmetic conditions. There was also a linear relationship between age and hand surface temperature during stressor conditions. Most important, significant interactions were found for both frontal EMG and heart rate measures with age. Post hoc analyses revealed differences on the frontal EMG levels between younger and older age groups during negative imagery, warm hand, and cold pressor conditions. Heart rate differences were found during positive imagery between the younger age group and the medium age group and during cold pressor between the younger age group and both the medium and the older groups. The implications of these findings are discussed.This research was supported in part by NINCDS Grant NS-15235.     

Can subjects maintain a constant criterion in a memory task?

In two recognition memory experiments, subjects rated how certain they were that a given test item had been shown previously. Subjects either received standard instructions about their rating criteria or were explicitly instructed to maintain criteria defined in the manner of Healy and Jones (1973) or along the lines of signal detection theory. When a priori probability varied, subjects in all instruction groups held constant the criteria defined by signal detection theory at the expense of shifting the criteria proposed by Healy and Jones. The results were taken as evidence for the psychological validity of recognition memory analyses based on signal detection theory.