Stress-induced Fos-like Immunoreactivity in the Pons and the Medulla Oblongata of Rats

Immunoreactivity of the immediate early gene c-fos was used to investigate changes in the activity of brainstem neurons in response to acute stressors like immobilization, formalin-induced pain, cold exposure, hemorrhage and insulin-induced hypoglycemia. Different stressors induced Fos-like immunoreactivity in different pontine and medullary neurons. A single, 3 hour immobilization was found to be a very strong stimulus that activated brainstem catecholaminergic (tyrosine hydroxylase-immunopositive) neurons and cells in the raphe and certain pontine tegmental nuclei, as well as in the reticular formation. Pain, induced by a subcutaneous injection of formalin was also effective on catecholamine-synthesizing neurons and on others cells in the nucleus of the solitary tract. Cold exposure activated cells mainly in the sensory spinal trigeminal and parabrachial nuclei and in the so-called "pontine thermoregulatory area". Moderate Fos-like immunoreactivity was induced by a hypotonic (25%) hemorrhage in medullary catecholaminergic neurons, the nucleus of the solitary tract and the Barrington nucleus. Among stressful stimuli used, insulin-induced hypoglycemia elicited the smallest Fos activation in the lower brainstem. The present observations indicate that different stressors may use different neuronal pathways in the central organization of the stress response.     

Victimization of Individuals with Legal Blindness: Nature and Forms of Victimization

This article reports the results of a study of the forms of victimization experienced by individuals with legal blindness. Semi-structured interviews with 58 legally-blind persons were conducted. Results reveal that individuals with legal blindness generally experience criminal victimization at rates consistent with the sighted population but, in some cases, experience certain forms of victimization at rates higher than the sighted population.     

Psychosocial factors and the development of breast cancer: a meta-analysis.

A meta-analysis examined the relationship between psychosocial factors and the development of breast cancer. Average effect sizes (Hedges's g) were calculated from 46 studies for 8 major construct categories: anxiety/depression, childhood family environment, conflict-avoidant personality, denial/repression coping, anger expression, extraversion-introversion, stressful life events, and separation/loss. Significant effect sizes were found for denial/repression coping (g = .38), separation/loss experiences (g = .29), and stressful life events (g = .25). Although conflict-avoidant personality style was also significant (g = .19), the effect size was less robust, and a moderate number of future studies with null results would reduce the significance. Results overall support only a modest association between specific psychosocial factors and breast cancer and are contrary to the conventional wisdom that personality and stress influence the development of breast cancer.     

The Structure of Vocational Interests for Diverse Racial-Ethnic Groups

We investigated differences in the circular structure of Holland's interests types across racial-ethnic groups (African Americans, Mexican Americans, Asian Americans, Native Americans, and Caucasians; N = 11,610). The samples consisted of college-bound persons who completed the revised Unisex Edition of the ACT Interest Inventory (UNIACT; Swaney, 1995), as well as comparison group of 10th graders ( N = 4,133) in the 1992 UNIACT norms sample. Analyses using a randomization test of hypothesized order, targeted principal components, and three-way multidimensional scaling suggest that Holland's model adequately represents the interest structures of both sexes in all the diverse samples.     

The stability of vocational interests from early adolescence to middle adulthood: a quantitative review of longitudinal studies

The present meta-analysis examined the stability of vocational interests from early adolescence (age 12) to middle adulthood (age 40). Stability was represented by rank-order and profile correlations. Interest stability remained unchanged during much of adolescence and increased dramatically during the college years (age 18-21.9), where it remained for the next 2 decades. Analyses of potential moderators showed that retest time interval was negatively related to interest stability and that rank-order stability was less stable than profile stability. Although cohort standings did not moderate stability, interests of the 1940s birth cohort were less stable than those of other cohorts. Furthermore, interests reflecting hands-on physical activities and self-expressive/artistic activities were more stable than scientific, social, enterprising, and clerical interests. Vocational interests showed substantial continuity over time, as evidenced by their higher longitudinal stability when compared with rank-order stability of personality traits. The findings are discussed in the context of psychosocial development.     

Perception of work reinforcer systems: Factor structure

The factor structure of 109 Occupational Reinforcer Patterns approximating the distribution of the employed labor force of the United States was investigated. These work-reinforcer systems, as perceived by almost 6000 raters, were found to be represented best by a three-factor solution. The factors were identified as a Self Reinforcement factor, an Environmental/Organizational reinforcement factor, and a Reinforcement via-Altruism factor. The factors were found to correspond to, respectively, the Achievement-Autonomy, Safety-Comfort, and Al-truism need factors of the Minnesota Importance Questionnaire. For these two measures utilized in the assessment of individual-environment correspondence, commensurate measurement—as required by person-environment fit theories—is possible.     

Is the delay discounting paradigm useful in understanding social anxiety?

The delay discounting paradigm was used to examine its utility in understanding motivational factors among socially anxious individuals. Participants (n=88) who reported high and low levels of social anxiety were randomly assigned to either a social threat or non-threat condition and their subsequent rates of discounting were examined. A significant difference in rates of discounting was found between the high and low social anxiety groups within the non-threat condition, with high social anxiety participants showing increased discounting. This study suggests that a modified version of the delay discounting paradigm may be useful in understanding motivational factors in social anxiety.     

Stability and change in work values: A meta-analysis of longitudinal studies

A meta-analysis of longitudinal studies was conducted to investigate stability and change in work values across the life span. Both rank-order stability and mean-level change were investigated using an integrative classification for intrinsic, extrinsic, social and status work values (Ross, Schwartz, & Surkis, 1999). Results of rank-order stability indicated that work values were stable individual differences (ρ = .62). The stability level was lowest during college years (18–22 years old) and highest after entering the workforce (22 years old and later). Work values were more stable than personality traits across all age categories, whereas not as stable as vocational interests during college years and adulthood. Baby Boomers were found to possess a higher level of rank-order stability as compared to Generation X. Mean-level results showed that during college years (18–22 years old), the population as a whole attached more importance to intrinsic values while deemphasizing all the remaining values; during the initial entry of the workforce (22–26 years old), only extrinsic values showed an increase in importance while all the other values decreased; later on after adulthood years (26 years and after), besides the continuous increase of extrinsic values, there was also a dramatic increase in status values. Theoretical and practical implications were discussed.     

Effects of Practice upon the Metabolic Cost of Mental Work

Two experiments with isopods, Armadillidium vulgare, were reported. In Experiment I, two groups of five Ss each learned to run a T maze to escape light and heat. Both original learning (OL), and relearning (RL) the next day, were to a criterion 9/10 correct. Between OL and RL one group was immobilized (I), and the other group was given the opportunity for activity (A). The I treatment resulted in greater savings on RL than did the A treatment, and it was thus concluded that A is a retroaction treatment. Experiment II was like I except that all Ss were extinguished immediately following OL, and then given either A or I until RL. In this experiment, the A treatment led to no savings, but the I treatment produced negative savings (more trials on RL relative to OL). It was concluded that the A treatment had retroactively interfered with extinction, and this result was discussed as analogous to differential spontaneous recovery in favor of the A group. It was concluded that Liberman's (4, 5) theory (that spontaneous recovery is due to the forgetting of extinction) is supported by the result of Experiment II.     

People--things and data--ideas: bipolar dimensions?

We examined a longstanding assumption in vocational psychology that people-things and data-ideas are bipolar dimensions. Two minimal criteria for bipolarity were proposed and examined across 3 studies: (a) The correlation between opposite interest types should be negative; (b) after correcting for systematic responding, the correlation should be greater than -.40. In Study 1, a meta-analysis using 26 interest inventories with a sample size of 1,008,253 participants showed that meta-analytic correlations between opposite RIASEC (realistic, investigative, artistic, social, enterprising, conventional) types ranged from -.03 to .18 (corrected meta-analytic correlations ranged from -.23 to -.06). In Study 2, structural equation models (SEMs) were fit to the Interest Finder (IF; Wall, Wise, & Baker, 1996) and the Interest Profiler (IP; Rounds, Smith, Hubert, Lewis, & Rivkin, 1999) with sample sizes of 13,939 and 1,061, respectively. The correlations of opposite RIASEC types were positive, ranging from .17 to .53. No corrected correlation met the criterion of -.40 except for investigative-enterprising (r = -.67). Nevertheless, a direct estimate of the correlation between data-ideas end poles using targeted factor rotation did not reveal bipolarity. Furthermore, bipolar SEMs fit substantially worse than a multiple-factor representation of vocational interests. In Study 3, a two-way clustering solution on IF and IP respondents and items revealed a substantial number of individuals with interests in both people and things. We discuss key theoretical, methodological, and practical implications such as the structure of vocational interests, interpretation and scoring of interest measures for career counseling, and expert RIASEC ratings of occupations.