Time errors and differential sensation weighting

Sixteen pairs of successive tones, with different amplitude combinations, were presented with 16 combinations of tone duration and interstimulus interval. A separate group of 12 subjects was assigned to each presentation condition and made comparative loudness judgments for each of the pairs. Perceived within-pair loudness differences were scaled by a Thurstonian method using the subjective width of the "equal" category as the unit. The scale differences were well described by weighted linear combinations of the sensation magnitudes of the tones in the pairs. The time error can be regarded as an effect of this differential weighting. For the longer interstimulus intervals, the weight of the second tone was the greater, causing the usual inverse relation between time error and stimulus intensity level. For the shorter interstimulus intervals, these effects were reversed. An analysis of the pattern of weights led to the development of two models, one of which is a generalization of Michels and Helson's time error model. The weights could be interpreted as reflecting the differential efficiency of the loudness information from the two compared stimuli.     

KIM and the rabbit: The use of the KIM-1 microprocessor to control classical conditioning of the rabbit’s nictitating membrane response

The KIM-1 microprocessor combined with a plug-board interface provides an inexpensive and highly flexible system for controlling classical conditioning of the rabbit’s nictitating membrane response. The system is described in the context of a program for differential conditioning.     

Conflict play and its modification in the course of treating children

The authors report their experience with a special form of psychodrama for the treatment in small groups of neurotic children aged five to fifteen. The acting out of ambivalent, partly unconscious and restrained tendencies and inclinations by playing, i.e., by taking roles in spontaneous performances, is followed by alternation of identification in the group and, possibly, careful indirect verbalization by the therapeutist and/or group, of which the purpose is to arrive at a reorientation of the attitudes of patients and a consolidation of the newly won attitude.     

Cardiac autonomic reactivity and recovery in predicting carotid atherosclerosis: the cardiovascular risk in young Finns study.

The present study examined the association of cardiac autonomic task-induced reactivity and recovery to preclinical atherosclerosis. Thirty-three men and 33 women aged 24-39 years participated in the ongoing epidemiological Cardiovascular Risk in Young Finns study. The authors measured heart rate (HR), respiratory sinus arrhythmia (RSA), and preejection period (PEP) during the mental arithmetic and speech tasks in 1999. Carotid atherosclerosis was assessed by measuring the thickness of the common carotid artery intima-media complex (IMT) with ultrasound in 2001. Higher HR, RSA, and PEP reactivity were associated with lower IMT values even after adjusting for cardiovascular risk factors (lipid levels, obesity, and blood pressure). In addition, better HR recovery after the mental arithmetic task was associated with lower IMT values, and this association persisted after all adjustments. Thus, higher task-induced cardiac autonomic reactivity and better HR recovery were related to less preclinical atherosclerosis. The authors concluded that cardiac pattern of reactivity and quick recovery may be associated with better cardiovascular health, and therefore all reactivity occurring in challenging situations should not automatically be considered as potentially pathological.     

Victim and Perpetrator Accounts of Hurtful Messages: An Actor–Partner Interdependence Model

This study examined how message characteristics and relational turbulence correspond with victim and perpetrator experiences of hurtful messages. Romantic partners described 2 events: one where each of them was a victim of the partner's hurtful message. Trained judges evaluated qualities of hurtful messages and participants reported relationship qualities, intensity of hurt experienced as a victim, and the partner's hurt feelings when the respondent was the perpetrator. Third‐party ratings of hurtfulness were associated with victims' intensity of hurt. For females, relational turbulence was associated with their intensity of hurt as victims. For males, relational turbulence was associated with their perception of the female victims' hurt. The authors discuss the implications for the work on hurtful messages and relational turbulence.     

Perceptual linkage of multiple objects rotating in depth

When multiple objects rotate in depth, they are frequently perceived to rotate in the same direction even when perspective information signals counterrotation. Three experiments are reported on this tendency to recover the rotation directions of multiple objects in a nonindependent fashion (termed rotational linkage). Rotational linkage was strongly affected by slant in depth of the objects, image perspective, and relative starting phase of the objects. Linkage was found not to vary as a function of the relative rotation speed of the objects or the relative alignment of their rotation axes. Rotational linkage is interpreted as a tendency of the visual system to assign signed depths to objects based on a communality of image point direction.