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EFFECTS OF PREOPTIC AND ANTERIOR HYPOTHALAMIC LESIONS ON MALE AND FEMALE SEX BEHAVIOR IN CASTRATED, ESTROGEN-INJECTED MALE RATS
Title
THE EFFECTS OF PREOPTIC AND ANTERIOR HYPOTHALAMIC LESIONS ON MALE AND FEMALE SEX BEHAVIOR IN CASTRATED, ESTROGEN-INJECTED MALE RATS.
Creator
Case, Pamela S., Florida Atlantic University
Abstract/Description
Forty-eight adult Long-Evans male rats were tested following castration for male and female sex behavior. Following baseline test Ss received 200 mug injections of estradiol daily except on days of female tests when 20 mug of progesterone were given. Tests for male and female behavior were alternated every third day. Significant increases in mean lordosis and male behavior occurred following hormone treatment. After hormone tests eight Ss received anterior lesions and five Ss received...
Show moreForty-eight adult Long-Evans male rats were tested following castration for male and female sex behavior. Following baseline test Ss received 200 mug injections of estradiol daily except on days of female tests when 20 mug of progesterone were given. Tests for male and female behavior were alternated every third day. Significant increases in mean lordosis and male behavior occurred following hormone treatment. After hormone tests eight Ss received anterior lesions and five Ss received preoptic lesions. Afer recovery Ss were placed on the same schedule of hormones and tests as for the previous condition. No significant changes in mean lordosis or male behavior occurred following either lesion. It was concluded that estrogen is effective in restoring male behavior and producing female sex behavior in castrated males. While no significant changes occurred following the lesions, it was determined that repetition and extension of the work is justified.
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Date Issued
1975
PURL
http://purl.flvc.org/fcla/dt/13718
Subject Headings
Sexual behavior in animals, Hormones, Sex, Estrogen, Castration
Format
Document (PDF)
Learning to hear new speech sounds: A dynamical approach
Title
Learning to hear new speech sounds: A dynamical approach.
Creator
Case, Pamela S., Florida Atlantic University, Charles E. Schmidt College of Science, Center for Complex Systems and Brain Sciences
Abstract/Description
When adults attempt to learn new speech sounds, they do so in the context of the phonology of their native language. The purpose of the present work is to investigate the nature of the learning process; that is, to examine, in individuals, (1) the process of acquiring a new phonetic category, (2) the impact of learning a new phonetic category on a similar, existing category, and (3) transfer of learning to a novel phonetic context. Monolingual American English speakers were required to learn...
Show moreWhen adults attempt to learn new speech sounds, they do so in the context of the phonology of their native language. The purpose of the present work is to investigate the nature of the learning process; that is, to examine, in individuals, (1) the process of acquiring a new phonetic category, (2) the impact of learning a new phonetic category on a similar, existing category, and (3) transfer of learning to a novel phonetic context. Monolingual American English speakers were required to learn the Hindi voiced, unaspirated, dental stop consonant. Two synthetic speech continua (one voiced, the other voiceless) were created, spanning a range from Hindi dental to American English alveolar stop consonants. Subjects underwent a perceptual mapping procedure that included identification, judged goodness, and difference-rating tasks in order to establish how they perceived the stimuli initially. Then they participated in a two-alternative, forced-choice training program using only voiced, natural speech stimuli. Progress was monitored throughout training. Following training, the mapping procedure was repeated with both the voiced and voiceless continua. After at least a two-week delay with no further training, subjects participated in a follow-up test. Results indicate that the nature of change during the learning process depends on how the individual listener perceives the stimuli prior to training and on the order of presentation of stimuli.
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Date Issued
1996
PURL
http://purl.flvc.org/fcla/dt/12475
Subject Headings
Language, Linguistics, Psychology, Experimental, Psychology, Cognitive
Format
Document (PDF)