Genetic Influence Helps Explain Variation in Human Fertility: Evidence From Recent Behavioral and Molecular Genetic Studies

To search for genetic influence on human fertility differentials appears inconsistent with past empirical research and prior interpretations of Fisher's fundamental theorem of natural selection. We discuss Fisher's theorem and give reasons why genetic influences may indeed account for individual differences in human fertility. We review recent empirical studies showing genetic influence on variance in fertility outcomes and precursors to fertility. Further, some of the genetic variance underlying fertility outcomes overlaps with that underlying fertility precursors. Findings from different cultures, different times, different levels of data, and both behavioral and molecular genetic designs lead to the same conclusion: Fertility differentials are genetically influenced, and at least part of the influence derives from behavioral precursors that are under volitional control, which are themselves genetically mediated.     

Sexual assault on college campuses: Is an ounce of prevention enough?

This article provides a construct-by-construct review of the effectiveness of sexual asault prevention programs in modifying sexual assault-related attitudes, cognitions, emotions, and behaviors. This article also discusses variables that may moderate program effectiveness, variables that may mediate program effectiveness, methodological issues, programs for special populations, and iatrogenic effects. In general, sexual assault prevention programs have been shown to be effective in producing short-term reductions in rape-supportive attitudes. There is insufficient evidence, however, to conclude that such programs are effective in reducing the incidence of sexual assault.     

TRAINED,GENERALIZED, AND COLLATERAL BEHAVIOR CHANGES OF PRESCHOOL CHILDREN RECEIVING GROSS-MOTOR SKILLS TRAINING

Three preschool children participated in a behavioral training program to improve their gross-motor skills. Ten target behaviors were measured in the training setting to assess direct effects of the program. Generalization probes for two gross-motor behaviors, one fine-motor skill, and two social behaviors were conducted in other settings. Results indicated that the training program improved the gross-motor skills trained and that improvements sometimes generalized to other settings. Contrary to suggestions in educational literature, the gross-motor training program did not produce changes in fine-motor skills or social behaviors. Implications for educators and for the development of the technology of generalization are outlined.     

IMPLICATIONS OF BEHAVIORAL PHARMACOLOGY RESEARCH FOR APPLIED BEHAVIOR ANALYSES: JEAB'S SPECIAL ISSUE CELEBRATING THE CONTRIBUTIONS OF JOSEPH V. BRADY (MARCH 1994)

We review four articles from JEAB's March 1994 issue celebrating the contributions of Joseph V. Brady. These articles have implications for studying private events and for studying multiple operants. We suggest that regularly including self-reports about private events in behavioral pharmacological research has resulted in an accumulated knowledge that has facilitated examination of interesting relations among self-reports, environmental factors, and other observable behaviors. Methodological lessons that behavioral pharmacologists have learned regarding the study of multiple operants are also relayed. We provide examples of how these lessons could be useful to applied behavior analysts studying nonpharmacological issues.     

The Many Meanings of Religiousness: A Policy-Capturing Approach

ABSTRACT This article reports the results of two policy-capturing studies that investigated individual differences in the meaning of religiousness. Policy capturing requires judges to respond to a large number of hypothetical scenarios or profiles that differ along a number of potentially relevant cues or attributes. Multiple regression analyses are then conducted to ascertain which cues are influencing each judge's responses. For both studies, 100 profiles were developed describing hypothetical individuals who differed on 10 cues thought to influence perceptions of religiousness (e.g., church attendance, doctrinal orthodoxy), and judges rated each profile on a 9-point religiousness scale. Judges in Study 1 were 27 Roman Catholic and Protestant college students. Policy-capturing analyses identified clear individual differences in the cues that afifected judgments of religiousness, and in the self-insight of the students into their personal policies. To test whether these findings reflected the youth or religious maturity of the sample, the study was replicated with a sample of 22 Catholic and Protestant clergy. Similar results were found in Study 2. In both samples, individual policy capturing did a significantly better job of predicting judgments of religiousness than did self-described policies or policies created by averaging across judges. Together these findings underscore the diversity of religious meanings and the need for further idiographic investigations in the psychology of religion.     

Gender Differences in Perceptions of How Others Are Affected by Self-Disclosure of Achievement

Three experiments were conducted at two east coast Universities with primarily Caucasian students participating. In experiment one, college students disclosed that they scored in the 91st percentile or in the top half on an intelligence-related test to a female student who had scored either in the 42nd percentile (low-achieving) or the 92nd percentile (high-achieving) on the same test. Women who disclosed modestly (top half) judged that the low-achieving other felt better than women who disclosed immodestly (91st percentile). Also, women who disclosed modestly judged that the other liked them more than women who disclosed immodestly. These effects did not occur with men. In experiment two, college students disclosed that they scored in the 91st percentile or in the top half on an intelligence-related test to either a male or a female student who had scored in the 42nd percentile on the same test. Women who disclosed modestly judged that a female peer liked them more and felt more intelligent and confident than did women who disclosed immodestly. In contrast, men who disclosed immodestly judged that a female peer liked them more than did men who disclosed modestly. Regardless of the peer's gender, women judged that peers felt worse about themselves, were less happy and more upset when subjects had disclosed immodestly. In contrast, men judged that the peer felt better about himself or herself, was happier and less upset when the subjects had disclosed immodestly. In Experiment 3, male and female participants rated the intelligence-related test as equally difficult and rated doing well on them as equally important. Participants also indicated that doing well was equally important to males and females. Thus, ego-involvement is ruled out as an alternative explanation. These findings support the interpretation of previous research that women may choose to disclose modestly in an effort to be better liked or to protect the other's feelings.     

Lexical co-occurrence and association strength

The 1-million-word Brown corpus was searched for co-occurrences of semantically related pairs of concrete nouns appearing within an arbitrary window of 250 characters. Related pairs of nouns (OCEAN-WATER) co-occur significantly more often than matched, unrelated pairs (OCEAN-HAND), and this difference remained significant within blocks of text up to 1000 characters in length. Frequency of co-occurrence, corrected for chance, is significantly correlated with association strength. Lexical distance between co-occurring members of a given pair is inversely correlated with association strength. Significantly more co-occurrences were found, per unit text, in the fictional sections of the corpus.