Sex Differences In
نویسندگان
چکیده
The aggressivity of adult males and females was evaluated by measuring (1)the frequency of aggressive displays that individuals made toward a mirror image stimulus following varying periods of social isolation, (2) the display frequency in brief, unisexual and bisexual bouts with live opponents, and (3)the reinforcing effects of mirror image stimulation on performance of an approach response. Isolation up to seven days increased aggressivity in both sexes. Males performed lateral display toward a mirror image or a live conspecific more frequently than females. Mirror image stimulation also was a stronger positive reinforcer in males than in females.
منابع مشابه
Sex differences and role of gonadal hormones in development of tolerance to morphine analgesia and glutamate level in the nucleus accumbens of rats: A microdialysis study
Introduction: Sex differences are observed in the development of tolerance to antinociceptive effect of opioid drugs such as morphine, but the underlying mechanisms remain unclear. Critical role of glutamate in the development and maintenance of opioid tolerance has been reported by many investigators. There are also evidences about interaction between gonadal hormones and neuromodulatory sy...
متن کاملSex Differences and Role of Gonadal Hormones on Glutamate Level After Spinal Cord Injury in Rats: A Microdialysis Study
Introduction: Sex differences in outcomes of Spinal Cord Injury (SCI) suggest a sex-hormone-mediated effect on post-SCI pathological events, including glutamate excitotoxicity. This study aimed to investigate the importance of gonadal hormones on glutamate release subsequent to SCI in rats. Methods: After laminectomy at T8-T9, an electrolytic lesion was applied to the spinothalamic tracts of m...
متن کاملSex Differences in the Association of Household Income with Amygdala Volume
Background: Household income and other socioeconomic position (SEP) indicators are among the most salient social determinants of children’s emotions and behaviors. Some research has shown that income and other SEP indicators may have certain sex-specific effects on the structures and functions of particular brain regions. Objectives: To investigate sex differences in the association of househ...
متن کاملSex Differences and Symptoms of Acute Coronary Syndrome
Background: The purpose of this study was to examine symptoms of acute coronary syndrom (ACS) with resect to sex differences. Methods: This comparative cross-sectional study was performed on patients older than 20 years with ACS who were hospitalized at cardiac wards. Sampling was performed through stratified sampling on the basis of sex. Five hundred male and female patients me...
متن کاملDetermination of sex and maturity in Acipenser stellatus by using ultrasonography
Knowledge of both sex and maturity stage without killing fish is important from many aspects. The establishment of accurate sex and maturity determination without external sexual dimorphism or when external characters are not developed has usually involved the use of either hormone radioimmunoassay or biopsy techniques. These methods are time and labor consuming as well as harmful to fish. Ther...
متن کاملDetermination of sex and maturity in Acipenser stellatus by using ultrasonography
Knowledge of both sex and maturity stage without killing fish is important from many aspects. The establishment of accurate sex and maturity determination without external sexual dimorphism or when external characters are not developed has usually involved the use of either hormone radioimmunoassay or biopsy techniques. These methods are time and labor consuming as well as harmful to fish. Ther...
متن کامل