Predicting brain organization from dichotic listening performance: Cortical and subcortical functional asymmetries contribute to perceptual asymmetries

The patterns of perceptual asymmetry elicited by dichotic speech and complex pitch stimuli were evaluated in a group of 28 normal, right-handed subjects. As in previous studies, between 70 and 75% of the subjects showed a right-ear advantage for speech and left-ear advantage for pitch. However, less than half of the subjects (46%) showed the expected pattern on both tests. It is argued that the assumption of symmetrical, contralateral auditory pathway superiority during dichotic stimulation is only appropriate in roughly half of the dextral population. In the remaining half, significant subcortical asymmetries and/or a lack of contralateral advantage appear to be present. The assessment of complementary cortical functions should provide a way to reduce the confounding of cortical and subcortical contributions to auditory perceptual asymmetries, and thus provide a more accurate behavioral index of brain organization.     

Parent vs. teacher reactions to problematic behavior of head start children

Studies of disciplinary responses to preschool children's transgressions often assume that subjects share the same degree of concern for the misbehavior under study. Individual differences in the strengths of different transgressions in eliciting disciplinary interventions were studied in 31 black mothers and 31 black teachers of Head Start children. Simulated situational urgency to discipline was measured by a Q-sort of 60 items depicting 10 types of misconduct observed in preschool classrooms. Attitudes of concern for the significances of the behaviors for the children's development were obtained through a separate rank-ordering procedure. Parents saw significantly more urgency in transgressions of social deportment. Teachers viewed aggressive and antisocial behaviors as more urgent, and tended to show closer agreement between intervention urgency and attitudes. Whereas teachers' interventions may be interpreted as responses to group child-care demands, the parents' concern for social deportment invites several interpretations.     

Career exploration in adulthood

The study described was designed to examine career exploration in the adult years, as seen from the perspective of decision-making behavior. Using conceptual models provided by H. B. Gelatt (Journal of Counseling Psychology, 1962, 9, 240–245) and D. V. Tiedeman (Personnel and Guidance Journal, 1961, 40, 15–21), two research questions were posed: (1) To what extent does exploration occur prior to more terminal career behaviors? and (2) To what extent are exploratory and terminal career decision modes interdependent? These questions were addressed by examining the series of decisions made by 95 subjects over a period of 18 years. The results supported the expectation that decisions made at earlier stages of development are more likely to be of an exploratory nature and that decisions made at later stages are more likely to be of a terminal nature. In addition, support was found for the hypothesis that decision-making strategies at various stages of development are interdependent.     

Regional cerebral blood flow patterns during verbal and nonverbal auditory activation

Current views of the relationship between audition and cerebral function suggest that increases in regional cerebral blood flow (rCBF) would occur in the superior, mid, and posterior portions of the temporal lobes, and that these changes would be more lateralized to the left hemisphere for a verbal than a nonverbal auditory task. We measured rCBF using the xenon inhalation technique in a group of healthy subjects during three conditions: (1) resting baseline, (2) auditory verbal activation (listening for word meaning), and (3) auditory nonverbal activation (listening for reduction of intensity in a series of noise bursts). Both verbal and nonverbal conditions produced highly significant increases in rCBF over the left posterior Sylvian region with a trend for verbal activation to evoke a wider area of flow increase than the nonverbal task.     

Encoding specificity in the alcoholic Korsakoff patient

A previous attempt to improve amnesic Korsakoff patients' retention of individual words resulted in only moderate improvement and, then, only under restricted conditions. It appeared that this occurred because the patients “forget” the instructed analysis of the word as well as the word itself. Consequently, the two experiments reported here sought to provide feature (Experiment 1) or associated (Experiment 2) cues at both input and output. In this manner relatively good performance was obtained, but only when semantic cues were “strongly” associated to the target words. Implications for an encoding specificity interpretation are drawn from these results.     

Word-by-word analysis of observer agreement utilizing audio and audiovisual techniques

The purpose of this study was to compare audio and audiovisual techniques of analyzing stuttering behavior using a recently developed index of agreement (Young, 1975). Twenty speech pathologists identified moments of stuttering for ten adult stutterers using both audio and audiovisual methods. Although no statistically significant differences existed between the two conditions, the listeners had more difficulty identifying moments of stuttering during the audio condition when mild stutterers were used.