Enhancement of Sander illusion in minimal form

This paper reports the effects of systematically reducing the number of component lines in the Sander parallelograms upon judgments of the relative lengths of the diagonal lines. The illusion was maximal when the parallelogram was reduced to its minimal form, viz., three parallel lines remained with all other lines, including the diagonals, omitted.     

Knowledge of the Unknown Child: A Systematic Review of the Elements of the Best Interests of the Child Assessment for Recently Arrived Refugee Children

Decision-making regarding an asylum request of a minor requires decision-makers to determine the best interests of the child when the minor is relatively unknown. This article presents a systematic review of the existing knowledge of the situation of recently arrived refugee children in the host country. This research is based on the General Comment No. 14 of UN Committee on the Rights of the Child. It shows the importance of knowing the type and number of stressful life events a refugee child has experienced before arrival, as well as the duration and severity of these events. The most common mental health problems children face upon arrival in the host country are PTSD, depression and various anxiety disorders. The results identify the relevant elements of the best interests of the child assessment, including implications for procedural safeguards, which should promote a child rights-based decision in the asylum procedure.     

The Effects of a PETTLEP Imagery Intervention on Learners' Coincident Anticipation Timing Performance

Little research has examined how imagery effects learners' acquisition of motor tasks requiring coincident anticipation timing (CAT). CAT is a fundamental component of hitting, passing, and receiving required in several sports. The purpose of the current study was to examine the effects of a PETTLEP imagery intervention on learners' CAT performance using a Bassin Anticipation Timer. Fifty-six participants (M = 20.61 years, SD = 2.48) were randomly assigned into one of four training groups: physical practice (PP), imagery practice (IP), imagery practice + physical practice (IP +PP), or a control (CON) group. The study consisted of three phases: pretest, intervention, and a posttest. Results revealed that the PP and IP+PP groups had significantly lower absolute timing error compared to the CON group on the posttest. The IP+PP group was the only group to have lower variable error compared to the CON group on the posttest. Results extend prior research by demonstrating that imagery combined with physical practice can benefit the learning of a CAT task and that imagery alone may not assist learners in acquiring tasks requiring CAT. Results are congruent with prior research demonstrating that imagery is most effective when combined with physical practice.     

Prompting a consumer behavior for pollution control

A field application of behavior modification studied the relative effectiveness of different prompting procedures for increasing the probability that customers entering a grocery store would select their soft drinks in returnable rather than nonreturnable containers. Six different 2-hr experimental conditions during which bottle purchases were recorded were (1) No Prompt (i.e., control), (2) one student gave incoming customers a handbill urging the purchase of soft drinks in returnable bottles, (3) distribution of the handbill by one student and public charting of each customer's bottle purchases by another student, (4) handbill distribution and charting by a five-member group, (5) handbills distributed and purchases charted by three females. The variant prompting techniques were equally effective, and in general increased the percentage of returnable-bottle customers by an average of 25%.     

Psychophysiological reactions to understimulation and overstimulation

Catecholamine output, heart rate, and performance efficiency were examined in 28 Ss during two contrasting stimulus conditions, one of understimulation, and one of overstimulation. During understimulation the subject spent 3 hr performing a vigilance task, and during overstimulation he was exposed for the same time period to a complex sensorimotor test. Both understimulation and overstimulation produced a significant increase of adrenaline and noradrenaline release as compared with a control condition involving a medium amount of stimulation. Subjects who excreted relatively more adrenaline performed significantly better during understimulation, whereas subjects with relatively lower excretion rates of adrenaline tended to perform better under overstimulation. When performance efficiency was related to heart rate it was shown that high-heart rate subjects performed better during understimulation, while low-heart rate subjects performed better during overstimulation.     

OBJECTIVE AND SUBJECTIVE PERFORMANCE AS INFLUENCED BY DRUG-INDUCED VARIATIONS IN ACTIVATION LEVEL

Performance was measured by seven sensorimotor and perceptual tests given to 30 students in six successive trials, spread over five hours, before and after the intake of either 15 mg dexamphetamine, zoo mg Pentobarbitone, or a placebo. Subjective performance, level of aspiration, wakefulness, and mood were measured by a scaling method. A close agreement was found between the amount of objective and subjective improvement following dexamphetamine, whereas the objective impairment induced by Pentobarbitone was not reflected in the subjective measures. These results were examined in relation to the other indices of activation.