Bloch’s law and a temporal integration model for simple reaction time to light

In a series of experiments designed to determine whether Bloch’s law holds for simple RT to low-energy visual stimuli, mean RTs were found to agree with Bloch’s law to a close approximation only when a narrow range of stimulus intensities is used. However, they could be accounted for more generally by (1) assuming that detection depends on a “visual response function” (VRF) initiated and maintained by the light stimulus (when the time integral of the VRF reaches a criterion, S detects the light and initiates a response): and (2) the fact that VRF generated by a square-wave flash rises quickly to its maximum, remains at this value for the duration of the flash, and then decays exponentially to zero after flash offset. S continues to integrate the VRF throughout its lifetime, and consequently for a brief stimulus, detection will occur during the exponentially decaying portion of the response-the portion corresponding to “visual persistence.” Finally. when luminances used vary by more than a factor of four. Bloch’s law fails to hold, while the model succeeds, implying that the temporal integration model more generally accounts for RTs.     

Patterns of interprofessional conflict resolution on school child study teams

This study proposes to investigate perceived and desired methods of conflict resolution by school psychologists, social workers, and learning disability specialists. Data were based on responses to a questionnaire which requested information on how decisions were reached or should have been reached when their child study teams were required to classify a child and there were conflicting opinions between professional groups. While majority vote and resolution by the psychologist accounted for the methods most often used in actual resolutions, there were great disagreements between professions as to how resolutions should have been made. Analysis indicates that the school psychologists are generally satisfied because they are the single group most often making final decisions, but they are generating feelings of discontent among other the other groups which suggst that team functioning and decision making, especially during voting, may be overly affected by interprofessional rivalry rather than objective data.     

The effects of parent-presented models and praise on the vocal behavior of their children

The combined and separate effects of parent-presented models and praise on specific vocalizations of three children (15, 17, and 20 months old) were investigated. The frequency of a specific vocalization was higher when parents modeled and praised it than when they did not. In addition, modeling and praise, when used in combination, had a greater effect on the frequency of specific vocalizations than when used separately. Three additional parents were asked to attempt, by any means they wished, to increase the frequency of a specific vocalization by their children. These parents used modeling almost, exclusively, and the children did not exhibit the specific vocalizations as frequently as did the children whose parents were instructed both to model and praise specific vocalizations.     

An ultrasonic motion detector,with data on stare,restriction of movement,and startle

The ultrasonic motion detector can measure activity in free-ranging Ss; it may be useful in studies of arousal. This device records counts of activity per unit of time. Sixty Ss were run in three experiments to evaluate the convenience and usefulness of the technique.     

Individual differences in habituation: Some methodological and conceptual issues

The personality correlates of habituation were investigated. A moderate intensity tone was presented 20 times on each of three sessions, and skin conductance and heart rate were recorded. There were no relationships between individual differences in rate of habituation and any of the personality dimensions assessed (which included, among others, manifest anxiety and introversion-extraversion). Some possible reasons are discussed for this lack of results, as well as for conflicting findings which fill the literature. Specifically, various methods of measuring habituation are examined and their interrelationships described. None of the measures derived showed adequate consistency either across sessions or over response modalities.     

A comparison of psychiatric patients' self-report with other sources of clinical information

This study compared self-report (MMPI item responses) of psychiatric patients who were experiencing different crises situations with other sources of clinical information. The results suggest that in a large number of instances item responses communicate information which is in agreement with what was known about the patients form other sources of information. The content of item responses was consistent with interpretations from several empirical measures of the Ss' test performance.     

Selective attention in cerebral palsied and normal children

Noninstitutionalized, educable retarded, spastic cerebral palsied children of two mental age (MA) levels were compared with normal MA controls on a task measuring selective attention and were not found deficient in selective attention. For both the cerebral palsied and the normals there was an increase in selective attention efficiency with an increase in MA. The results support the position that MA rather than chronological age or IQ is the important variable in determining selective attention performance. The results do not support the attention-deficit theory; they do support the argument that institutionalization has a negative affect on attention. The effects of brain damage and retardation on selective attention ability were discussed.Thanks are expressed to Eleanor Rennie, Head Teacher, Robert Massie, Supervisor of Special Education, and E. F. DeFord, Assistant Director, Department of Research for the Richmond Public Schools, Richmond, Virginia. Appreciation is also given to Scott Hamrick, Principal, Jackson Via Elementary School, Charlottesville, Virginia. Susan Autrey is also thanked for assistance in data collection.     

Promoting career information seeking behaviors in college students

This study was concerned with the effects of group reinforcement counseling on the frequency of career information-seeking behaviors for 94 theoretically grouped college freshmen and sophomore males. Holland's Vocational Preference Inventory (VPI) was used to identify consistent-inconsistent vocational patterns and Crites' Vocational Inventory (VDI) was used to identify vocational maturity-immaturity. Predictions about behavioral change were made for each theoretical conception. Three counseling sessions each 1.5 hr long were utilized. Pre-, post-, and post-post measures of cognitive and active information seeking behaviors outside of the treatment sessions were taken. Group reinforcement counseling and vocational consistency were significantly related to behavioral change over the 6 weeks of this investigation. Unanticipated results regarding the tested dimensions and behavior change are reported and discussed.     

Assessment of vocational maturity

A comparison is made between the Vocational Development Inventory and the Readiness for Career Planning scale when both were administered to the same sample. An analysis of covariance, with intelligence controlled for, indicated that both instruments show an over-all progression in vocational maturity at different grade levels, as well as differences between socioeconomic groups. A correlational matrix found vocational maturity scores from the two instruments to be significantly related.