Parallel ocular and manual tracking responses to a continuously moving visual target

Continuous ocular and manual tracking of the same visual target moving horizontally in sinusoids at 0.75 Hz was measured by lag, RMS Error, and Gain. The best measures of accuracy of tracking, error and lag, were remarkably similar in the two systems and were affected similarly by presence of a background and changes in predictability of target movement. Details of within-system performance varied despite the over-all parallels. Gain was different in adjustment of proportion of saccadic to pursuit movement was affected by the presence of the hand, even though this did not affect tracking accuracy. The over-all parallel of response adjustment suggests that a suprasystem decision-maker sets general response goals and each motor system adjusts output details to match these goals.     

Structuring of early reaching movements: a longitudinal study

Reaches, performed by 5 infants, recorded at 19 weeks of age and every third week thereafter until 31 weeks of age, were studied quantitatively. Earlier findings about action units were confirmed. At all ages studied, movements were structured into phases of acceleration and deceleration. Reaching trajectories were found to be relatively straight within these units and to change direction between them. It was also found that at all ages, there was generally one dominating transport unit in each reach. The structuring of reaching movements changed in four important ways during the period studied. First, the sequential structuring became more systematic with age, with the dominating transport unit beginning the movement. Second, the duration of the transport unit became longer and covered a larger proportion of the approach. Third, the number of action units decreased with age, approaching the two-phase structure of adult reaching. Finally, reaching trajectories became straighter with age.     

逻辑的范围

人们在作出陈述时,可能提供论据以支持它们,也可能不这样。一个被论据支持的陈述是一个论证的结论,而逻辑则提供对论证进行分析的工具。逻辑分析所涉及的是结论和支持它的论据之间的关系。人们思考时,作出推理,这些推理可以转变为论证,而逻辑工具这时就应用于这些得出的论证之上。这样,就可以检验产生这些论证的推理。逻辑研究论证与推理。它的主要目的之一是为区别逻辑上正确的与不正确的论证与推理提供方法。     

次协调逻辑研究之一:辩证法的对立统一原理

次协调逻辑(para-consistent logic)是那些把有意义的不协调理论形式化的逻辑。另一方面,辩证逻辑是把建立在黑格尔、马克思及其后继者提出的观念、原则之上的理论形式化的逻辑。这样的学科与次协调逻辑是相互交叉的。     

The fertility related behavior of Mexican American adolescents

Data from a clinic sample of pregnant adolescents are analyzed for differences in fertility related variables between Mexican American and non Mexican. The independent variables are birthplace, ethnicity, and exposure to United States culture of Mexican and non Mexican adolescents. The dependent variables are talking about sex, pregnancy, birth control, hearing about birth control, and use of birth control. The data support the hypothesis that in the process of acculturation the fertility related behavior of immigrant Mexican adolescent females is affected by the indigenous United States Mexican culture rather than by United States Anglo culture. Implications for delivery of services are discussed. The delivery of fertility related services should take into account the cultural preferences of Mexican women, and should not involve coercion from legal or medical authorities. While liberation of Mexican American women, and accompanying changes in childbearing patterns may be desirable, these efforts should originate within the Mexican American community. Data is presented in tables on selected sample and subsample characteristics and compares fertility behaviors across ethnic groups, including Anglo, Black, US non-Mexican, and US Mexican.     

Comparison of observational recordings in vivo, via mirror, and via television

Simultaneous observational recordings were made in vivo, via an observation mirror, and via closed circuit television. Three of nine observers had extensive experience recording behavior in vivo; three had extensive experience recording behavior via mirror; and three had extensive experience recording via television. Observers recorded nine categories of disruptive behavior for children in a special class setting. Frequencies of behavior recorded in vivo, via mirror, and via television differed significantly for only one category, vocalization. There were no significant main effects or interactions involving the observers' previous experience. Occurrence reliability coefficients computed within and between media demonstrated the similarity of observer agreement in all three media. Data collection procedures using an observational mirror or closed circuit television appear to be reasonable alternatives to in vivo observation in circumstances similar to those in the present study.     

A comparison of the Bem Sex-Role Inventory and the Heilbrun Masculinity and Femininity Scales

This study compares two instruments which have recently been devised to measure sex-role identification, Heilbrun's Masculinity and Femininity Scales and the Bem Sex-Role Inventory. Correlations between the masculine and feminine scales of these instruments were significant for male but not female subjects; intrascale comparisons found no relationship between the Bem scales but moderate correlations between the Heilbrun scales for male subjects. There was agreement between the two measures in classifying approximately 47% of the subjects into one of the four sex-role categories. Misclassification occurred primarily on categories which have been found to show considerable overlap in personality characteristics.