Effects of cocaine exposure on infant development: A review

We review the effects of maternal cocaine use on the developing human fetus and infant in terms of methodological problems; the physiological action of cocaine on adults and on the developing fetus; the epidemiology of cocaine use; effects on fetal and infant mortality; growth of cocaine-exposed fetuses and infants; physical anomalies; evidence for and against infant withdrawal from cocaine; neurological effects; behavioral effects as shown by the NBAS; findings related to mother-infant interaction and emotional development; and parenting by cocaine-using mothers. Findings in most areas should be considered preliminary due to methodological problems. Published studies of long-term development are not yet available. In general, deleterious consequences of prenatal cocaine exposure are found for some portion of prenatally exposed infants. However, many findings of no difference are also available in methodologically well-controlled studies.     

Effects of reinforcer duration on responding in two-link chained interval schedules

Each of five pigeons was exposed to two or more durations of access to mixed grains on two-link, chained, interval schedules in which both links were identical fixed-interval or variable-interval schedules. Response rates were an increasing function of reinforcer duration for both initial and terminal links. For both types of interval schedules, initial-link response rates were more sensitive to reinforcer duration than were terminal-link response rates. The present results, together with prior ones, suggest that chaining and choice procedures are each sufficient for demonstrating substantial sensitivity of responding to changes in reinforcer duration.     

Reliability of psychophysiological assessment

In order to assess the reliability of psychophysiological recording, 15 subjects were assessed on multiple response measures (forehead EMG and forearm flexor EMG, heart rate, skin resistance level, hand surface temperature and cephalic vasomotor response), under multiple stimulus conditions (baseline, self-control, cognitive and physical Stressors), on multiple occasions (Days 1, 2, 8 and 28). Three forms of reliability coefficients were computed for each response measure: coefficients on absolute scores, coefficients on change scores from baseline to stressful conditions and coefficients on percent change from baseline. Only frontal EMG appeared to have consistently high absolute reliability coefficients, with hand surface temperature having high reliability if sessions are repeated within 1 week. Heart rate was less consistently reliable. Treating the responses as relative measures did not increase their reliability; indeed, hand surface temperature was completely unreliable when examined in this fashion. Implications of this study for behavioral medicine, biofeedback and anxiety-based disorders research, as well as Lang's tripartite response system model of fear and emotion, are discussed.     

Perception of stress contrasts in semantic and nonsemantic contexts by children

Journal of Psycholinguistic Research - Using 140 subjects (20 children each from kindergarten through the sixth grade), this study followed the developmental trends of children on two tasks...     

Matching the rate of concurrent tone bursts and light flashes as a function of flash surround luminance

Subjects adjusted the rate of a repeating toneburst to match that of a concurrently flashing light, or vice versa. Flashes were viewed in luminous or wholly dark surrounds. Matches usually departed from veridical rate matches, and always were affected in the same direction by changes in surround luminance. Matches were a function of whether subjects controlled the visual or auditory stimulus; also, subjects usually reported “driving” of flash rates by auditory rates when they controlled tone rate, but not when they controlled flash rate.     

Children of Incarcerated Mothers

We review the literature on children whose mothers are incarcerated in jails or prisons. These children typically experience a great many risk factors besides their mothers' incarceration, including poverty, drug and alcohol problems in their families, community violence, and multiple changes in caregivers. Children's lives are greatly disrupted when mothers are arrested, and most children show emotional and behavioral problems. The impact this has depends on the age of the child, the alternate caregiving arrangements, and the course of the mother's incarceration. Children of incarcerated mothers experience internalizing (fear, withdrawal, depression, emotional disturbance) and externalizing (anger, fighting, stealing, substance abuse) problems, as well as heightened rates of school failure and eventual criminal activity and incarceration. Research in this area is scarce and often of poor quality. A research agenda which is guided by a transactional, ecological, and developmental model, and which examines children's well-being over the course of the mothers' incarceration is suggested.     

Masculinity,femininity, and androgyny: A methodological and theoretical critique

The three primary purposes of this investigation are: (1) to apply confirmatory factor analysis (CFA) to responses from three instruments [Bem Sex Role Inventory (BSRI), Comrey Personality Scale (CPS), and Australian Sex Role Scale (ASRS) developed by Antill and his colleagues] designed to measure masculinity (M) and femininity (F); (2) to determine the correlation between M and F on each instrument and to relate the results to the design of the instrument; and (3) to describe a new theoretical model that posits global M and global F to be multifaceted, higher order constructs. When CFA was used to define one M and one F factor from responses to each instrument, the disattenuated correlations between M and F were +0.58 (BSRI), ?.50 (ASRS), and ?1.0 (CPS). Thus, responses from two instruments supported the separation of M and F, but differed in the direction of the correlation for the two traits, while the third provided remarkably strong support for a bipolar MF continuum. Despite the apparent inconsistency, the observed correlations were explicable in terms of the design of each instrument. While the two-factor model provided a reasonable fit for the BSRI, more complicated models were better able to fit responses to the ASRS and CPS. Results from this investigation and other research were used to formulate a new theoretical model.     

Duration of subsegments within the intervocalic interval in stutterers and nonstutterers

Intervocalic intervals (IVI) from the contextual fluent speech of 14 stutterers and controls were examined at one-quarter speed on simultaneously prepared spectrograms and intensity x time displays. Seven subsegments within the IVI were identified and their durations compared between the two groups. Stutterers were slower than controls in transitional subsegments, corresponding to movements of the tongue and larynx, but not in steady-state subsegments. The results are interpreted as suggesting that stutterers are not able to move their laryngeal and supralaryngeal structures as quickly as nonstutterers.     

Participation in competitive amateur sports as a function of psychological androgyny

Previous research has indicated that women who participate in competitive sports tend to score low on traditional measures of femininity, and such women have been characterized as masculine (Harris, 1975). These studies used the Bem Sex Role Inventory (BSRI; Bem, 1974) to measure the degree of sex-typing in 25 male and 23 female competitors in a national racquetball tournament and 24 male and 27 female competitors in local badminton, squash, and handball tournaments. Results for the first study indicated that a larger percentage of androgynous women as compared to traditionally feminine or masculine women entered the racquetball tournament, whereas the largest percentage of male entrants were in the masculine role category. Results for the second study indicated that among contestants who cited a competitive reason for entering the tournament, a larger percentage of both men and women were sex-typed as androgynous or masculine rather than feminine. These results were subsequently reanalyzed according to an alternate procedure suggested by Bem (1977) in order to compare the behavior of subjects who score high on both masculinity and femininity and those who scored low on both. While the percentages of masculine, feminine, and androgynous subjects were changed by the new categorization procedure, there were no differences found between high—high and low—low scorers. Implications of these results for the traditional characterization of women participants in competitive sports and for the usefulness of the BSRI in predicting nonlaboratory behavior are discussed.Portions of this article are based on an honors thesis submitted by the senior author to the University of Winnipeg. The authors are indebted to Stephen Davis and Wayne Andrew for their comments on the data analysis and their constructive criticisms of an earlier draft of this article.