Lethality of suicide attempt rating scale

An 11-point (0-10) scale for measuring the degree of lethality of suicide attempts is presented. The scale has nine example "anchors" and uses the relative lethality of an extensive table of drugs. The psychometric studies show the scale to be of at least equal-interval, possibly even ratio measurement level. The equal-interval quality allows suicidal behaviors to be specified in numeric relationship to each other relieving us of the burden of using unquantified labels such as "mild," "moderate," and "serious." Having a standardized, commonly used reference scale should greatly facilitate our research and clinical efforts to communicate our findings. The scale can be used reliably by nonmedical personnel with no prior training.     

Stimulus information vs processing time in auditory pattern recognition

Previous studies have shown that pitch perception improves with increases in tone duration. An increase in tone duration increases the information available in the stimulus presentation. Other recent experiments have shown that sufficient perceptual processing time is also necessary for accurate pitch perception. The present study determines the relative contribution of stimulus information and processing time in an absolute pitch indentification task. The results indicate that processing time is more critical than stimulus information. The results are described accurately by a model that describes the perceptual process in terms of the information in the stimulus and the time the information is available for perceptual processing.     

Temporal course of perceived auditory duration

A series of experiments explored the temporal course of the perceived duration of an auditory stimulus. A backward recognition masking paradigm was utilized, in which the subject was to determine which of two target durations was presented on a given trial. The target tone was followed, after a variable silent intertone interval, by a masking tone which could assume one of three possible durations. Identification of the long target was found to improve consistently with increases in the intertone interval. In contrast, identification of the short target was as accurate at the short as at the long intertone intervals. Blocking the intertone interval across experimental sessions eliminated these differences between the two target tones. Performance on both the long and the short target tones improved monotonically with increases in the intertone interval. When masking tone duration was randomized within an experimental session, identification of the long (short) target was most accurate with the longer (shorter) masking tone. Blocking the duration of the masking tone across experimental sessions eliminated the effect of the duration of the mask, but did not alter any of the other results. A model, proposed to account for the results, assumes that the percept of target duration grows over time, and can be terminated by the onset of the masking tone. The masking tone also acts to lengthen the perceived duration of the target tone, and this lengthening is a direct function of the duration of the masking tone.     

Automated psychophysiology laboratory

A laboratory has recently been established in University Hospital based on a PDP-11 /40 processor running a real-time Executive (RSX-ll/D) which has storage and data acquisition peripherals to handle on-line processing of psychophysiological data from patients receiving biofeedback. A data acquisition program has been written which permits the sampling of eight simultaneous channels of data coming from a Hewlett-Packard 7700 electrophysiological recorder system. Input from the patient includes switch closures and variable resistors, thermistors, GSR, electrocardiogram, respiration rate, and a variety of others. Feedback to the patient includes a variety of types of lights, a cathode ray tube storage screen, a character-oriented CRT monitor, and a variety of audio signals. Developers are presently involved in writing the biofeedback section of the programs and an on-line decision-making dependent upon patient response. Simultaneously with laboratory operation, a number of other users are served. These include the Admitting Department and Respiratory Function Laboratory. A rat laboratory will be served also by this facility in the near future via a front-end microprocessor.     

Rate of perceptual processing

Summary The primary goal of Schulze and Schuster's (1977) experiment was to test Massaro's (1972) hypothesis that the rate of processing of the auditory image after the tone is turned off is equal to the rate of processing the stimulus code while the stimulus is present. The experiment was unsuccessful, however, since the authors did not take into account corresponding changes in the asymptote parameter of the model with changes in stimulus duration. This review discusses the problem in detail along with a general discussion of model testing and appropriate experimental procedure.This research was supported by Public Health Service Grant MH-19399. Wendy L. Idson provided valuable comments. Requests for offprints should be sent to Dominic W. Massaro, Department of Psychology, University of Wisconsin, Johnson at Charter Streets, Madison, Wisconsin 53706, USA     

The effect of sex labels on adults' knowledge of infant development

The present study investigated the influence of sex label of an infant on adult men's and women's knowledge of infant development. Two hundred thirty nine adults were asked to indicate on a questionnaire the age at which they believed infants were first able to perform a variety of developmental skills. The 56 skills equally represented cognitive, language, motor, and personal-social behaviors. One third of the adults received a questionnaire about girls, one third about boys, and one third about babies (sex label not provided). Each of the three groups had equal numbers of men and women. Contrary to previous findings, results indicated that the sex label of the infant did not affect adults' ratings of behaviors. This finding is discussed with respect to current cognitive-social psychological conceptualizations of gender stereotypes.Portions of this paper were presented at the annual meeting of the Early Childhood Education Conference, Kent, Ohio, October 1984, and the American Psychological Association, Los Angeles, California, August 1985.     

A simple procedure for accurately manipulating face-voice synchrony when dubbing speech onto videotape

A system is described involving an audio-video tape recorder, a control device, and a delay timer that dubs speech sounds onto prerecorded lip movements on videotape. Accuracy of synchrony or measured asynchrony between the sound and lip movements is a few milliseconds.     

A bidimensional model of pitch in the recognition of melodies

Pitch can be conceptualized as a bidimensional quantity, reflecting both the overall pitch level of a tone (tone height) and its position in the octave (tone chroma). Though such a conceptualization has been well supported for perception of a single tone, it has been argued that the dimension of tone chroma is irrelevant in melodic perception. In the current study, melodies were subjected to structural transformations designed to evaluate the effects of interval magnitude, contour, tone height, and tone chroma. In two transformations, the component tones of a melody were displaced by octave intervals, either preserving or violating the pattern of changes in pitch direction (melodic contour). Replicating previous work, when contour was violated perception of the melody was severely disrupted. In contrast, when contour was preserved the melodies were identified as accurately as the untransformed melodies. In other transformations, a variety of forms of contour information were preserved, while eliminating information for absolute pitch and interval magnitude. The level of performance on all such transformations fell between the levels observed in the other two conditions. These results suggest that the bidimensional model of pitch is applicable to recognition of melodies as well as single tones. Moreover, the results argue that contour, as well as interval magnitude, is providing essential information for melodic perception.     

An age apart: the effects of intergenerational contact and stereotype threat on performance and intergroup bias

An experimental study examined the effect of intergenerational contact and stereotype threat on older people's cognitive performance, anxiety, intergroup bias, and identification. Participants completed a series of cognitive tasks under high or low stereotype threat (through comparison with younger people). In line with stereotype threat theory, threat resulted in worse performance. However, this did not occur if prior intergenerational contact had been more positive. This moderating effect of contact was mediated by test-related anxiety. In line with intergroup contact theory, more positive contact was associated with reduced prejudice and reduced ingroup identification. However this occurred in the high threat, but not low threat, condition. The findings suggest that positive intergenerational contact can reduce vulnerability to stereotype threat among older people.