Becoming an expert in the musical domain: It takes more than just practice

Previous research has supported the theory that acquisition of expertise in any domain is possible for healthy individuals with sufficient deliberate practice, but such an extreme environmental position brings the existence of innate talent into question. The present study investigates the effects of both environmental factors and talent on expert performance in both high school and conservatory-level musicians. Audition scores and accumulated practice time were recorded, and correlated with scores on Gordon's Advanced Measures of Music Audiation and Raven's Progressive Matrices. Higher-level musicians report significantly higher mean levels on innate characteristics such as general intelligence and music audiation, in addition to higher levels of accumulated practice time. These factors together accounted for more of the variance in music performance than practice alone. A multi-factor view is thus shown to be the best explanation for the acquisition of musical expertise.     

Social risk and protective factors for African American children's academic achievement and adjustment during the transition to middle school

The transition to middle school is often marked by decreased academic achievement and increased emotional stress, and African American children exposed to social risk may be especially vulnerable during this transition. To identify mediators and protective factors, the authors related severity and timing of risk exposure to academic achievement and adjustment between 4th and 6th grade in 74 African American children. Longitudinal analyses indicated that severity more than timing of risk exposure was negatively related to all outcomes and that language skills mediated the pathway from risk for most outcomes. Transition to middle school was related to lower math scores and to more externalizing problems when children experienced higher levels of social risk. Language skills and parenting served as protective factors, whereas expectations of racial discrimination was a vulnerability factor. Results imply that promoting parenting and, especially, language skills, and decreasing expectations of racial discrimination provide pathways to academic success for African American children during the transition from elementary to middle school, especially those exposed to adversity.     

Effects of a Carbohydrate Supplement upon Resting Brain Activity

Glucose is a major energy source for the brain, and along with several monosaccharide derivatives as components of brain gangliosides, they play important roles in neurologic function. However, there is little information available on the role of glucose and other monosaccharides on resting brain activity. This study was designed to evaluate the effects of a single dose of a carbohydrate supplement containing glucose and several of its derivatives on resting brain activity in 20 healthy male college students. The supplement provided an insignificant amount of carbohydrate (3.9 g), protein (0.28 g), fat (0 g), and calories (14 kcal). The amount of glucose in the supplement was 0.5 g (1% the amount of glucose used in adult studies of cognitive functioning and memory). We hypothesized that the glyconutrient supplement would enhance brain activity associated with alertness and attention. The study design was double blind, with subjects randomly assigned to one of two orders, either carbohydrate supplement week one followed by placebo a week later, or the opposite. Electrical brain activity was monitored by 15 electrodes positioned at nine standard international 10-20 system locations, including three bilateral pairs at frontal, parietal, and occipital sites. Thirty minutes following ingestion of a placebo or carbohydrate supplement drink, EEG activity was recorded for 10-mins while subjects focused on a stationary visual target. Spectral power of resting brain activity was computed and analyzed contrasting the placebo and supplement groups. Relative to placebo, the carbohydrate supplement significantly enhanced power in three brain wave frequencies (theta, alpha, and beta) that are known to be associated with attention and arousal. Since changes were observed in the supplement but not placebo group, our study suggests that additional sugars in the glyconutritional supplement facilitate enhancement of brain electrical activity. Whether the apparent enhancement of arousal in baseline recordings is associated with improved task performance remains to be determined.     

Threat as a Motivator of Political Activism: A Field Experiment

The research reported here examined the effects of two potential motivators of political activism—policy change threat and policy change opportunity—in a field experiment. Different versions of a letter were sent by a political lobbying organization to potential contributors. One version highlighted threats of undesirable policy changes, another version highlighted opportunities for desirable policy changes, and the third version did neither. Policy change threat increased the number of financial contributions made to the interest group, but policy change opportunity did not. Policy change opportunity increased the number of signed postcards returned to be sent to President Clinton, but policy change threat did not. These findings highlight the impact of interest group recruitment strategies on citizen responsiveness and demonstrate the need to account for sources of motivation in order to more fully understand when, why, and how citizens choose to become politically active.     

Is there a sex difference in lateralization for processing of humorous materials?

Leventhal and Cupchik (1976) reported an unpublished finding that women rate items funnier with left-ear input, while men give higher ratings with right-ear input. This finding, widely cited in the literature, has sometimes been quoted as evidence for a biological basis for sex differences in humor appreciation, in particular, and in information processing, in general. However, the effect has apparently never been replicated. In this study, 120 subjects rated the funniness of 35 monaurally-presented comedy excerpts, with half of the subjects receiving input over each ear. Although the experiment had several features intended to maximize replicability, the reported sex difference was not found. While failure to find an effect in a particular case is not definitive, it is troubling to see such widespread citation of an unpublished and apparently unreplicated effect and to see rather extreme conclusions based on it receive serious consideration in the literature.This research was supported by a University College of Cape Breton research grant and by a job internship grant awarded by Enterprise Cape Breton Corporation. I am very grateful to Wayne Baillie, Manager, UCCB Electronic Learning Center, for his assistance in conducting this experiment. An earlier version of this paper was presented at the annual meeting of the Canadian Psychological Association, Ottawa, June, 1990.     

Stability and change in types of behavioral disturbance of children and adolescents

Changes with aging and stability of dimensions of behavioral disturbance were determined for 732 children and adolescents who constituted the sample reassessed after 5 years of an original cross-sectional sample of Manhattan youth 6 to 18 years old. On three of the six types of disturbance strongly related to the total impairment judgments of psychiatrists, specifically those tapping domains of aggression, greater or constant levels of pathology were noted over time. Cross-sectional versus longitudinal analyses on the same types of disturbance had discrepant results half the time. Stability coefficients for five of the six types of disturbance were greater than .55. Stability curves by age cohorts investigated whether a type of disturbance appeared transitory at certain age periods but more crystallized at other ages. Its prognostic significance would vary accordingly. Implications for intervention-treatment and for studies comparing the predictive value of different classes of behavior, e.g., neurotic versus antisocial, are discussed.This investigation was supported by U. S. Public Health Service Project Grants MH-11545 and MH-18260 of the National Institute of Mental Health, Center for Epidemiological Studies. Support for the principal investigator was given by Career Scientist Grants I-338 and I-640 of the Health Research Council of the City of New York. The principal investigator is currently supported through Research Scientist Award K5-MH-20868 of the National Institute of Mental Health.This research was presented in part at the Eastern Psychological Association Meetings, April 3–5, 1975, New York City.     

Visual recognition memory in reflective and impulsive children

Twenty-nine reflective and 29 impulsive fifth-grade boys were tested in a forced-choice visual recognition memory task. In three of the experimental conditions (1FD, 2FD, 4FD) the number of visual feature differences between the correct and incorrect test stimuli was 1, 2, or 4, and correct response could not be based on the name of the stimulus; in the fourth condition (DO) the correct and incorrect test stimuli had different names. As predicted, performance on DO and 4FD was equivalent and was superior to that on 1FD and 2FD. Although reflective Ss made more correct responses than impulsive Ss in all four conditions, only the performance difference in Condition 1FD was significant. Mean correct response latencies mirrored the correct response data. These results were consistent with the Selfridge-Neisser feature-testing model of recognition memory, and it was argued that the primary underlying basis for the dimension of reflection-impulsivity was that reflective Ss tend to engage in a more detailed visual feature analysis of stimulus arrays. Strong inferential evidence was provided that visual feature analysis independent of verbal labeling was responsible for successful recognition performance in these Ss.     

Masculinity-femininity of self-concept: Its effect on the achievement behavior of women

The achievement behavior of women was examined in relation to their masculinity-femininity of self-concept and the mediating effects of the situation. The masculinity-femininity of self-concept of 58 female subjects was determined through the Personal Attributes Questionnaire (J. Spence, R. Helmreich, and J. Stapp, The Personal Attributes Questionnaire: A Measure of Sex Role Stereotypes and Masculinity-Femininity, Catalog of Selected Documents in Psychology, 1974, 4, 43–44). These subjects then competed in either a mixed-sex or same-sex group. Each subject was led to believe she was a high-ability performer in relation to the group members she competed against. While feminine women did not display poorer performance when competing against lower ability males than lower ability females, they did feel more ambivalence than the others about performing successfully in a competitive situation.The author gratefully acknowledges the contributions and support of Dr. M. L. Dietz, Dr. W. Libby, Dr. L. M. Jackson, and Dr. F. Schneider.     

The CLIPR remote laboratory microprocessor system: Development and applications

The introduction of microprocessor technology into the centralized experiment automation facilities of CLIPR separates data processing functions and real-time functions. Three examples of real-time intelligent terminals are described. The implementation process, principles, and examples for using microprocessor technology in this way is described in some detail.