Biorhythms in the activity of children during free play

The interaction between the arousal to action of environmental stimuli and recovery from that activity was presumed to generate biorhythms in the activity level of children. The level of environmental stimuli was manipulated by varying the play-group size and the apparatus, and higher environmental complexity was expected to produce more pronounced rhythms. The heart rates of 16 subjects playing in monad, dyad, and tetrad group sizes, in two playroom configurations, were monitored and spectral analysis used to locate significant biorhythms. There was a tendency toward 40-min (slow frequency) and 15-min (fast frequency) biorhythms. The group size manipulation produced the strongest biorhythmic behavior in the dyadic groups. Apparatus differences were not significant but the configuration containing a minimum quantity of play apparatus produced more variable activity than the configuration containing a large amount of play apparatus.     

日伪统治时期南京的娼妓业

南京沦陷后,抗日战争前被明令禁止的娼妓业在日伪政权的大力推动下公然发展起来.日伪政权对娼妓业的发展并非漫无限制,而是采取了划定妓院区域、定期体检、征收妓捐等措施.但是,南京娼妓业的泛滥,严重败坏了南京社会风气.     

Transfer of responding during serial conditioning in the rat

In three experiments rats were conditioned with the sequence tone-light-food. In the first experiment the source of the light was a bulb located on the wall of the conditioning chamber. Serial conditioning resulted in subjects approaching the bulb during the tone, even though it was not illuminated. The strength of this activity was greater when the tone was intermittently rather than consistently followed by the light. For Experiments 2 and 3 the source of the light was placed in the food magazine, and this resulted in greater magazine activity during the tone when it was intermittently rather than consistently paired with the light. It is suggested that the level of orientation to the light during the tone is, in part, a reflection of the amount of attention paid to the tone. It is further suggested that the tone receives more attention when it is an inaccurate rather than accurate predictor of its consequences.     

Response patterning during stimulus generalization in the rat

Nine rats were trained to bar press in the presence of a clicking sound of 6.67 cps (S(D)) for 1-min variable-interval food reinforcement randomly alternated with a clicking sound of 20 cps (S(Delta)) signifying extinction. After a criterion of 90% of total responses in the presence of the S(D) was obtained, a generalization test was administered, including values of 6.67, 10.00, 13.33, and 20.00 cps, with responses in the presence of the S(D) continuing to be reinforced during testing. The test yielded a gradient of response strength with rate highest in the presence of the S(D) and decreasing with increasing distance from this value. An interresponse time (IRT) analysis of responding during generalization testing revealed no systematic differences in modal IRT category or in median IRT to the different test stimuli. Mean IRT was lowest in the presence of the S(D) and increased systematically with increasing distance from this value, supporting the hypothesis that the generalization gradient of response rate is primarily the result of an increasing proportion of "long" IRT responses to stimuli increasingly distant from the S(D).     

Sexual harassment in universities during the 1980s

This review examines research studies since 1980 that investigate instructor-student sexual harassment in university settings. Implications are discussed.     

Psychoanalysis in the Netherlands during World War II

To understand what happened in the psychoanalytic world in Holland during the German occupation (1940-1945) we must have knowledge of the conflicts within the Dutch Society of Psychoanalysis in the nineteen-thirties. Those conflicts mainly deal with the subject of lay analysis, the compulsory training analysis and in general if compliance with foreign, with IPA rules was advisable. These differences of opinion reached their peak when four Jewish psychoanalysts arrived from Germany in 1933. The Dutch Society broke up in two parts, but was reunited in 1938. During the German occupation the training was finally regulated according to the IPA rules. This lead to a new splitting in the world of Dutch psychoanalysis that has not been healed to date.     

Gender differences in the development of relationships during late adolescence

Until recently, inadequate measures of affiliation need and relationship closeness hindered investigations into the social development of adolescents. For example, assumptions about gender differences (Douvan & Adelson, 1966; Gilligan, 1982) and age-related changes (Dunphy, 1972; Erikson, 1968; Newman & Newman, 1976) in affiliation need and relationship closeness have remained virtually untested. To better understand adolescent social behavior and test these assumptions, recently developed measures of affiliation need and interpersonal closeness were used to examine seventy-four 18- to 20-year-olds. In support of Erikson's theory, need for social comparison declined with age for both sexes. However, in support of Gilligan's theory, not only were females more attached to their partners, but these gender differences were most pronounced for the 18-year-olds. Finally, Dunphy's (1972) assumption that adolescents' need for stimulation peaks around age 18 or 19 and then declines, and Newman and Newman's (1976) position that need for emotional support declines in later adolescence, held true--but only for females.     

Reversibility of the other-race effect in face recognition during childhood

Early experience with faces of a given racial type facilitates visual recognition for this type of face relative to others. To assess whether this so-called other-race effect can be reversed by subsequent experience with new types of faces, we tested adults of Korean origin who were adopted by European Caucasian families when they were between the ages of 3 to 9. The adoptees performed a face recognition task with photographs of Caucasian and Asian faces. They performed exactly like a control group of French participants, identifying the Caucasian faces better than the Asiatic ones. In contrast, a control group of Koreans showed the reverse pattern. This result indicates that the face recognition system remains plastic enough during childhood to reverse the other-race effect.     

Changes in the dynamics of tremor during goal-directed pointing.

For successful performance of activities requiring a fine level of manipulative control and dexterity, precise control over the intrinsic oscillations (tremor) in each segment is essential. However, the question of how individuals control (minimize) their tremor during precise postural movements remains unresolved. The aim of this study was to investigate the changes observed in limb tremor during goal-directed postural pointing tasks. Seven subjects attempted to minimize limb tremor during a pointing task whereby progressively greater levels of accuracy were required. Subjects held a small lightweight laser pointer in their extended hand during all tasks, the goal being to maintain the laser emission within a specified target area. Frequency analysis showed that the tremor profile for the hand and index finger was characterized by two prominent frequency peaks, located between 2-4 and 8-12 Hz. When the accuracy requirement of the task increased, there was a significant increase in the amplitude of the 8-12 Hz peak for all segments. Analysis of the time series component of tremor revealed a similar trend with the root mean square (RMS) and approximate entropy (ApEn) of the finger tremor increasing as the accuracy requirement increased. This same pattern was not seen for hand tremor where a small but systematic decrease in both the tremor RMS and ApEn was observed. Overall, it would appear that subjects attempted to reduce tremor at the finger by exerting greater control over the hand (as evidenced by decreased tremor output and increased regularity in the tremor signal). Unfortunately, the consequence of this strategy was that the tremor in the distal effector actually increased. Changes in the tremor output observed as a result of defining an explicit external goal probably resulted from the enhanced visual information provided by the laser emission. However, it would appear that subjects were not able to utilize this feedback effectively to reduce their tremor during the targeting tasks.     

Systematic changes in the rate of instruction during driver training

Relatively little empirical evidence exists concerning variations in the quantity of instruction across learning in complex, real‐world tasks. Examination of driving instructors' remarks to pupils during actual lessons indicated the rate of comment declined in a coherent fashion across training, most consistent with a power function. The presence of a power law is reminiscent of learning functions found from studies in other skill domains when using indexes of performance, and suggests that quantity of instruction therefore might be used to assay the performance in complex tasks. The implications of these findings, for both basic and applied research, are discussed. Copyright © 2007 John Wiley & Sons, Ltd.