Temporal Regularity of Tapping by the Left and Right Hands in Timed and Untimed Finger Tapping

The temporal characteristics of repetitive finger tapping by the left and right hands were examined in two experiments. In the first experiment, interresponse intervals (IRIs) were recorded while right-handed male subjects tapped in synchrony with an auditory timing pulse (the synchronization phase) and then attempted to maintain the same tapping rate without the timing pulses (the continuation phase). The left and right hands performed separately, at four different rates (interpulse intervals of 250, 500, 750, and 1500 ms). There was no asymmetry of the asynchronies of the timing pulses and the associated responses in the synchronization phase or of the IRIs in either phase, but there was an asymmetry in the temporal dispersion of the responses in both phases. In the second experiment, right-handed males tapped separately with each hand at three different speeds: as quickly as possible, at a fast but steady rate, and at a slow rhythmical rate. The speed asymmetry present when tapping as quickly as possible (with the preferred hand tapping more quickly) was reduced when tapping at the fast steady rate and was absent when tapping at the slow rhythmical rate. The temporal dispersion of the IRIs produced by the nonpreferred hand was greater than the temporal dispersion of those produced by the preferred hand in all speed conditions. These results show smaller temporal dispersion of tapping by the preferred hand in right-handed males under different conditions, including submaximal speeds at which both hands respond at the same rate. This suggests that the motor system controlling the preferred hand in right-handers has more precise timing of response output than that controlling the nonpreferred hand.     

Gross Motor Performance in Minimally Brain Injured Children

As a pre-requisite to curriculum development, the characteristics of the gross motor performance of special education classes of minimally brain injured boys and girls were described. In general, age changes in mean performance were linear, the scores of the boys being the superior. The level of performance very closely resembled that of comparison groups of educable mentally retarded children from the same school districts.     

Repeated measurement of salivary cortisol within and across days among shy young adults

Temperamental shyness emerges early in childhood and remains relatively stable throughout development and has been associated with high and low levels of the stress hormone cortisol. Studies examining the relation between shyness and cortisol have been limited because they have traditionally collected only one measure of cortisol on a single day in the laboratory, restricting the reliability and diurnal profile of the measure in the participant’s everyday environment. We collected 15 saliva samples across three separate days (i.e., upon waking, +60 min post-waking, +8 h post-waking, +10 h post-waking, and bedtime) in a sample of healthy young adults selected for high and low shyness in order to characterize a portion of the diurnal cortisol rhythm. Overall, shy individuals demonstrated relatively lower cortisol across the day and across multiple mornings than non-shy adults. Higher self-reported social anxiety across multiple measures was also related to lower total cortisol levels across all participants. The present study replicates and extends our previous findings of low salivary cortisol measured in the laboratory in shy adults to repeated measurement in their everyday environments.     

“Soft” Versus “Hard” Psychological Science: Biased Evaluations of Scientific Evidence That Threatens or Supports a Strongly Held Political Identity

Perceptions of the quality of two kinds of psychological methods—brain magnetic resonance imaging (MRI) and cognitive testing—were assessed in response to a scenario in which an expert's opinion rendered a politician incompetent to continue in his elected position. Participants evaluated the quality of MRI evidence more favorably than cognitive testing evidence, an effect that was particularly pronounced among participants motivated to disbelieve the evidence (strong partisans of the same party as the politician). This study is among the first to underscore the potential real-world implications of layperson's perceptions of psychological methods and to highlight that evaluations of “softer” methods may be more malleable than the “harder” ones.     

Community Psychology and Transformative Policy Change in the Neo-liberal Era

I present ideas about how community psychologists, as researcher-activists, can influence public policy. I begin by describing the current neo-liberal era, noting the immense obstacles it poses to progressive policy change. Next I contrast two approaches to understanding policy formation, evidence-based policy and discursive policy analysis, and argue that transformative policy change can benefit from both approaches. I then propose three types of policy outcomes that community psychology research and activism should aim to promote: (a) shaping problem definition, (b) controlling channels for debate and participation, and (c) allocating resources. I use examples from community psychologists’ involvement in policy, mostly in Canada, to illustrate how such policy change can be both achieved and constrained. I conclude by discussing implications for theory and practice related to policy change.