Dimensional separability or flexibility of attention? Age trends in perceiving configural stimuli

The hypothesis that perceptual development proceeds from less to greater dimensional separability was tested by giving a speeded classification task to first and fouth graders. In Experiment 1, children sorted line drawings of a cartoon figure into two piles according to his eyes (open or closed) or his mouth (smiling or frowning). First graders exhibited the pattern characteristic of integral dimensions: An interference effect was found when dimensions were combined orthogonally and a facilitation effect when dimensions were correlated, relative to a condition in which only one dimension varied. Fourth graders exhibited an optional separable pattern: There was facilitation in the correlated condition but no interference in the orthogonal condition. These results support the hypothesis that development proceeds toward greater flexibility of attention rather than simply toward increasing separability. A flexible field hypothesis of visual attention was suggested to explain how older children can exercise such optional separability. This hypothesis correctly predicted the asymmetrical relation between dimensions found in Experiments 2 and 3: For both first and fourth graders, the eyes of a cartoon figure (open or closed) and his location (right or left) were nonseparable when the eyes were relevant and separable (or optional separable) when location was relevant.     

An investigation of repetition and language processing in a case of conduction aphasia

A study is reported of a single case of conduction aphasia. A battery of tasks designed to investigate the parameters of the patient's severe repetition deficit is supplemented by tests of several language functions. The results provide extensive information on a wide range of the patient's language abilities and are used to evaluate the adequacy of four models that have been offered to account for conduction aphasia. An argument is made in support of the suggestion that the syndrome of conduction aphasia should be divided into two subgroups based on patients' ability to select and realize phonemes in speech output. It is concluded that the best explanation for the disorder of patients with repetition deficit but without significant speech output problems is the hypothesis that repetition ability is compromised by a pathological limitation of auditory-verbal short-term memory. This hypothesis is extended to account for the pattern of results obtained in the language tasks.     

Right-hemispheric damage and verbal problem solving behavior.

Patients with right-hemisphere damage, who ostensibly have no linguistic impairment, are relatively incapable of solving two-term series problems in which comparative adjectives in the premise and question are antonymic. This finding suggests that such verbal reasoning depends, in part, upon nonlinguistic imaginal processes subserved by the right hemisphere. In this manner, the right hemisphere is often required for the full elaboration of linguistic input.     

The interaction of cognitive styles and classroom environment in determining first-graders' behavior

This study investigates the importance of two “person” variables, reflection impulsivity and divergent thinking, and one “situation” variable, the classroom climate of first-grade classrooms, for the classroom adaptation of first-graders. Three types of classrooms differing in classroom climate were selected: open, intermediate, and traditional. Subjects were the children (n = 189) in these classrooms. Classroom adaptation variables included self concept, school attendance, and teacher ratings of classroom behavior, overall academic rank, and personal preference. Both main effect and interactional relationships between “person” and “situation” variables and classroom adaptation were hypothesized. Classroom environment was found to affect degree of classroom disturbance manifested by the children with students in open classrooms exhibiting most and students in the intermediate classrooms exhibiting least. Boys in the open classrooms had higher achievement anxiety and lower teacher preference ratings than boys in traditional or intermediate classrooms. Reflective children obtained higher ratings as self-reliant learners and, for boys, reflection was related to low classroom disturbance and high achievement anxiety. Interactional relationships between classroom environment and reflection-impulsivity were also found for boys. Divergent thinking was not related to classroom adjustment for boys. Girls high in divergent thinking were higher in school involvement and achievement anxiety and more preferred by teachers.     

Perception of temporally competing speech stimuli in preschool children

The aim of this study was to investigate the perception of competing speech stimuli in 3-, 4-, and 5-year-old normally developing children. A dichotic listening paradigm was used in which the temporal alignment between the two stimuli was varied to represent three levels of competition. Minimal, moderate, and maximal levels of temporal competition were represented by a Separation, Lag, and Simultaneous test condition, respectively. The subjects were behaviorally set to listen for and to report the two stimuli on each trial. The incidence of double correct responses in the test conditions was the measure of interest. The results show a sharp and linear drop in double correct scores from the Separation, to the Lag, and to the Simultaneous condition. There were no age-related differences in the Separation and the Simultaneous conditions. In the Lag condition, the performance of the 3-year-olds was significantly lower than the 4- and 5-year-olds. The findings were interpreted to be indicative of limited auditory processing ability in preschoolers for moderately and maximally competing speech stimuli.     

Individual versus organizational predictors of job satisfaction and turnover among professionals

In a constructive replication and extension of previous research, the relative importance of individual (personality and professional attitudes) versus organizational (professional reward system and tenure) variables in predicting job satisfaction and turnover was investigated for the case of professionals. Support among a sample of computer specialists was found for the notion that, among professionals, individual variables are more important than organizational factors in predicting satisfaction with the work itself; but individual variables often played a major role in satisfaction with contextual aspects of the job as well. Organizational factors were found to be significantly predictive of satisfaction with all aspects of the job, but were the only significant predictors of turnover. Thus the importance of organizational factors over individual factors for professionals was supported more clearly for the behavioral outcome, turnover, than for attitudinal outcomes.     

Decision processes in verifying category membership statements: Implications for models of semantic memory

Current models of semantic memory assume that natural categories are well-defined. Specific predictions of two such models, the Smith, Shoben, and Rips (1974a) two-stage feature comparison model and the Glass and Holyoak (1974/75) ordered search model, were tested and disconfirmed in Experiment I. We propose an alternative model postulating fuzzy categories represented as sets of characteristic properties. This model, combined with a Bayesian decision process, accounts for the results of three additional experiments, as well as for the major findings in the semantic memory literature. We argue that people verify category membership statements by assessing similarity relations between concepts rather than by using information which logically specifies the truth value of the sentence. Our data also imply that natural categories are fuzzy rather than well-defined.     

春秋战国哲学流派研究的反思

经过几十年的积淀,春秋战国哲学流派研究取得了丰硕的成果,但是也存在着需要认真反思的地方。春秋战国哲学流派历史价值认识不充分,哲学阵线的机械划分,哲学范畴、概念的教条比附,文献资料理解的歧义,简牍帛书的利用不足,指导理论的简单化、研究方法的单一化等,分别从不同的侧面制约着春秋战国哲学流派研究的深入发展,也影响着对中国古代哲学的精确理解。