Predicting exercise in late midlife from young adult personality characteristics

This study explored the relationship between personality and exercise over the life span by using young adult personality characteristics to predict current exercise behavior in late middle-aged male graduates from the Harvard University classes of 1942 to 1944. After controlling for prior exercise behavior, body build, and fitness in young adulthood, we found that personality variables improved classification accuracy in discriminant analysis, and especially improved identification of frequent exercisers. Personality variables positively associated with frequent exercise include affective vitality, integration, lack of anxiety, and lack of shyness. Results are interpreted as supporting a psychobiological account of exercise behavior. Caution is suggested in generalizing the results to other populations, such as less privileged socio-economic classes or females.

The language of altered states

To compare the subjective experience of different forms of altered states of consciousness, computerized content analysis was applied to 66 autobiographical accounts of schizophrenia, hallucinogenic drug states, or mystical ecstasy and to 28 autobiographical control accounts of important personal experiences. The patterns of lexical choice used by the four groups were significantly different in word frequencies from 49 of 83 lexical categories measured. When data from the 13 most statistically significant categories were used in discriminant and classification analyses, 84% of the samples were correctly identified by their word frequencies. These findings suggest that the subjective experiences of schizophrenia, hallucinogenic drug-induced states, and mystical ecstasy are more different from one another than alike.

Diagnostic classification through content analysis of patients' speech

Speech samples from 71 patients in four diagnostic groups were analyzed by two quantitative methods of speech content analysis, the results of which were entered into a discriminant analysis to test whether patients could be accurately classified back into their appropriate diagnostic groups. These classifications were compared with classifications made by two psychiatrists, blind to the patients' diagnoses, who read transcripts of the speech samples. The results suggest that data from the systematic quantification of lexical choice can be used to classify patients into their respective diagnostic groups and that this classification compares favorably with that done by psychiatric raters.

Some correlates of prospectively defined premenstrual syndrome

Correlates of prospectively defined premenstrual syndrome were investigated in 50 women who visited a premenstrual syndrome clinic. To assess premenstrual symptom change relative to daily change, the author used effect size, the difference in mood ratings between the post- and premenstrual phases divided by the standard deviation of the entire cycle. Only 12 women had an effect size greater than or equal to 1.0 in two cycles. The probability of having premenstrual syndrome was positively related to working outside the home and negatively related to age. The results underscore the need to use prospective diagnostic criteria in research on premenstrual syndrome.

The effects of vitamin B6 supplementation on premenstrual symptoms

A double-blind controlled study of the effects of vitamin B6 supplementation on premenstrual symptoms was conducted. Fifty-five women who reported moderate to severe premenstrual mood changes participated in the study. Symptoms were monitored prospectively through daily home record-keeping over a one-month baseline period followed by two months of treatment. Subjects were randomly assigned to receive daily supplements of 150 mg of vitamin B6 or placebo over the entire two-month treatment period. Analysis of covariance suggested that even though vitamin B6 may improve premenstrual symptoms related to autonomic reactions (eg, dizziness and vomiting) and behavioral changes (eg, poor performance and decreased social activities), a significant amount of physical and affective symptomatology remained during the premenstrual phase. In light of recently reported, potentially toxic effects of low doses of vitamin B6, our results call for caution in using this therapy for premenstrual symptoms.

A Methodological Note on Content Analysis: Estimates of Reliability

The reliability of measurements obtained from a dictionary-based form of content analysis was investigated in this experiment by tape-recording subjects as they spoke about a predetermined topic in two separate sessions 1 week apart. Subjects were randomly assigned to speak in one of two contexts. The content of transcripts of these sessions was analyzed using adaptations of the Harvard III Psychosociological Dictionary and the General Inquirer content analysis program (Stone, Dunphy, Smith, & Ogilvie, 1966). Reliability was high over time, both within and between sessions, and there were few differences observed between contexts. Results are discussed in terms of their implications for the use of content analysis in personality research.

Linguistic dimensions of affect and thought in somatization disorder

DSM-III has established diagnostic criteria that separate somatization disorder from other overlapping symptom configurations. Nevertheless, information regarding the experience of somatization disorder is far from complete. Terms such as "masked depression" or "alexithymia" imply that a disturbance of affect is a central but guarded issue for at least some somatizing patients. Through content analysis of speech, the authors investigated the self-experience of somatization disorder in relation to affective disorder. Rather than defended depression, a distinctive characteristic found in the language of patients with somatization disorder reflects a confused, negative self-identity.

Content analysis: a comparison of manual and computerized systems

Computerized content analysis is a technique for classifying texts. In personality research it has been used to make inferences about psychological states and traits of the speaker or writer. Whereas computerized techniques have been increasing in both sophistication and ease of use, questions remain regarding their validity compared to hand-scored scales. In this study, we compare a relatively simple computerized technique; a more sophisticated, context-sensitive computerized approach; and a context-sensitive, human-scored system. Seventy-one subjects, representing four diagnostic groups, provided free-speech samples which were scored according to all three methods. Data from each method were then submitted to discriminant and classification analyses. In comparing the classification performance of the three methods, we found that both computerized methods were more accurate than the human-scored method. The time and cost benefits of computerized systems are discussed.