Reaction times (RTs) slow and become more variable with age. Research samples are typically small, biased, and of restricted age range. Consequently, little is known about the precise pattern of change, whereas evidence for sex differences is equivocal. The authors reanalyzed data for 7,130 adult participants in the United Kingdom Health and Lifestyle Survey, originally reported by F. A. Hupper...

Existing theories on life span changes in confidence or motivation suggest that individuals' preferences to enter competitive situations should gradually decline with age. We examined competitive preferences in a field experiment using real financial stakes in 25- to 75-year-olds (N = 543). The critical dependent variable was whether participants chose to perform a simple mental arithmetic task...

Can young children report coherently on their emotions, and how do their reports contribute to our understanding of emotional development? Two-hundred six children ages 3 to 6 years participated in structured laboratory tasks designed to elicit a range of positive and negative emotions and indicated their emotional state following each task. Children's reports of their emotions meaningfully var...

AIM This study aimed to examine sex and age differences of various stepping movements in the elderly and to clarify useful stepping movements for evaluation of their dynamic balance. METHODS Two hundred and eighty-six healthy elderly subjects who could walk independently (male mean age = 71.2 +/- 7.1 years; female mean age = 71.5 +/- 6.0) performed the following stepping tests: back and forth...

Infertility is one of the couple´s problems in different society. Based on the researches done, the rate of infertility is almost 12 to 20 percent. Studies considered infertility as a source of metal disorders. It has not only physiological aspects but also psychological aspects. The results of the studies done by mental health specialists , psychologist , have shown that infertile people are a...

Age and sex differences of carbon clearance from the peripheral blood of the rat were investigated. The clearance of carbon was more rapid in the young rats than in the old. Sex difference was significant in the rats of 10 and 14 weeks old, but not significant in the rats of 3 weeks old. Liver blood flow, extraction rate of carbon by the liver and whole circulating blood volume may be the facto...

introduction: sexual dimorphisms in biological structures such as brain and behaviour have been widely recognized in animals and humans. the purpose of this study was to examine whether there are sex differences in the size of the cerebellum with other body traits, such as the head, tail and brain. methods: twelve grasscutters comprising of 6 males and 6 females were used in this study. each br...

Safer sex is important and comprises of a series of five condom-related behaviours: accessing, carrying, negotiating, using and disposing. This study explored potential gender and age differences in these condom-related behaviours. Data suggests gender differences exist for accessing, carrying and disposing behaviours. An age difference was seen in accessing behaviour. Therefore future safer se...