Some correlates of stuttering severity judgments

Thirteen adult male stutterers recorded the Amplifier Passage on high-quality audiotape. One sentence from each recording was paired with one sentence from each of the remaining 12 recordings. The resulting 78 sentence pairs were presented to eight speech-language pathologists who were asked to judge which stutterer in each pair was more severe and to rate the confidence of each of these judgements. The confidence ratings were analyzed by means of the individual differences model of multidimensional scaling. The results suggested that reading rate and the number of intrasentence pauses were important parameters in determining the severity of stuttering.     

Implicit sources of bias in employment interview judgments and decisions

This study empirically examined implicit sources of bias in employment interview judgments and decisions. We examined two ethnic cues, accent and name, as sources of bias that may trigger prejudicial attitudes and decisions. As predicted, there was an interaction between the applicant name and accent that affected participants’ favorable judgments of applicant characteristics. The applicant with the ethnic name, speaking with an accent, was viewed less positively by interviewers than the ethnic named applicant without an accent and non-ethnic named applicants with and without an accent. Furthermore, modern ethnicity bias had a negative association with the favorable judgments of the applicants, which, in turn, affected hiring decisions. Implications of the results, limitations of the study, and directions for future research are discussed.     

Some sources of variance in skin conductance

An attempt was made to identity some of the factors that might contribute to the variance associated with skin conductance. Results confirmed earlier findings that Blacks have lower levels of skin conductance than Caucasians. The precise role of skin albedo is difficult to determine because within these groups there appears to be a negative relationship between skin reflectance and skin conductance. Possibly peripheral blood flow differences are responsible. There were no differences in heart rate or in self-report measures of arousal between the groups, and the contribution of personality variables to skin conductance variance was, in part, anomalous.     

Some new hypotheses on the mediation of loudness judgments 1

A new solution to the problem of relating equal-interval and ratio scales is proposed. It is shown that it is also possible, with the type of theory proposed, to predict results of cross-modality matching experiments.     

Some types of error in a choice response task

Errors from a serial response task involving single-finger responses to alphabetic stimuli are analysed and discussed in relation to findings which have been reported from tasks with more compatible stimulus-response relationships. Errors are divided into three distinguishable subsets and in each case found to have longer latencies than correct responses. Those which result from mirroring the required response about the centre of the hand are found to resist elimination during practice and their frequency seems to depend on the type of code used. In all cases error correction times are faster than the times to make a correct response but mirror errors and errors involving a finger adjacent to the correct response are corrected faster than other errors. The findings are discussed in relation to the theory of choice reaction time and error correction.     

Motor response variations: peripheral and central sources of error

The purpose of this research was to test the hypothesis that the relative involvement of peripheral versus central nervous system activity during response variations determines the locus of error production in a subsequent criterion response. The hypothesis was tested by comparing ipsilateral and contralateral transfer of a criterion response following response variations that emphasized proportionately different involvement of the peripheral and central systems. When subjects were provided with knowledge of results (KR) to maintain a 30% maximum voluntary contraction (MVC), ipsilateral but not contralateral bias errors occurred on a subsequent dynamic response. When subjects maintained a 30% MVC without KR, however, subsequent ipsilateral bias errors were greater than contralateral bias errors. Finally,when subjects imaged a 30% MVC, subsequent bias errors were equivalent across limbs. These results are interpreted as support for the hypothesis.     

Complex movement patterns: Learning retention and sources of error in recall

In this study of kinaesthesis, the learning, retention, and recall of complex patterns was examined. Subjects were blindfolded, held a stylus in the right hand, and moved around stencil patterns, either actively or passively. The patterns were recalled with a free active movement of the right hand, after various amounts of practice, immediately or after a 60-s interval, once or twice in succession, with and without visual guidance. The shape and size of the drawings was compared with the criterion patterns. The effect of practice varied depending on whether the criterion movement was active or passive, and on the measure of recall performance. Even when the criterion patterns were freely practised, the recall traces showed large errors in shape and systematic shrinkage in size, and there were large individual differences. Regardless of these errors, recall performance was reliable. The effect of an unfilled retention interval varied as a function of practice. When the patterns were recalled under visual guidance, there was no shrinkage in the size of the drawings.     

Some sources and consequences of career exploration

The present research investigated (a) factors that may influence participation in career exploration, and (b) the role of anxiety in the exploration process. The sample consisted of 161 undergraduate college students. Work-role salience (the importance of work in a person's life) was positively related to participation in self-related and work-related exploration. Self-related exploration was positively related to satisfaction with the occupational decision of low anxiety students and was negatively related to satisfaction among high anxiety students. Furthermore, dissatisfaction with an occupational decision was more likely to stimulate future work-related exploration for low anxiety students than for highly anxious students. The implications of these findings for the career exploration process were discussed.     

How the propagation of error through stochastic counters affects time discrimination and other psychophysical judgments

The performance of fallible counters is investigated in the context of pacemaker-counter models of interval timing. Failure to reliably transmit signals from one stage of a counter to the next generates periodicity in mean and variance of counts registered, with means power functions of input and standard deviations approximately proportional to the means (Weber's law). The transition diagrams and matrices of the counter are self-similar: Their eigenvalues have a fractal form and closely approximate Julia sets. The distributions of counts registered and of hitting times approximate Weibull densities, which provide the foundation for a signal-detection model of discrimination. Different schemes for weighting the values of each stage may be established by conditioning. As higher order stages of a cascade come on-line the veridicality of lower order stages degrades, leading to scale-invariance in error. The capacity of a counter is more likely to be limited by fallible transmission between stages than by a paucity of stages. Probabilities of successful transmission between stages of a binary counter around 0.98 yield predictions consistent with performance in temporal discrimination and production and with channel capacities for identification of unidimensional stimuli.     

Some sources for a slip in a translation by Freud

Among Freud's papers, we find instances in which Freud describes the "psychopathology of everyday life" as he found it in himself and in others. "A Religious Experience" (Freud, 1928) contains examples of both kinds. In addition, this paper contains a slip of which Freud appears to have been unaware. Freud's paper interprets a religious conversion described in a letter written to him in English. In the translation of this letter into German, Freud inserted material that was not present in the original. He mentions another slip he made in speaking about the letter. These slips and some associated details in the paper indicate persisting unconscious conflict. The content of these slips and details points to an association with Freud's childhood anxiety dream reported in The Interpretation of Dreams (Freud, 1900). Freud's associations and discussion of that dream lead to the Philippson Bible of his childhood, which provides additional connections to the paper of 1928.