Uninformed Consent? The Effect of Participant Characteristics and Delivery Format on Informed Consent

Although many people choose to sign consent forms and participate in research, how many thoroughly read a consent form before signing it? Across 3 experiments using 348 undergraduate student participants, we examined whether personality characteristics as well as consent form content, format, and delivery method were related to thorough reading. Students repeatedly failed to read the consent forms, although small effects were found favoring electronic delivery methods and traditional format forms. Potential explanations are discussed and include participant apathy, participants trying to save time by not reading the consent form, and participant assumptions about consent forms.     

THE REDUCTION OF SELF INJURY IN TWO ADOLESCENTS WITH PROFOUND RETARDATION BY THE ESTABLISHMENT OF A SUPPORTED ROUTINE

Two experiments applied a conceptualization of competence to the treatment of self injury in two adolescents with profound retardation. In Experiment 1, a multiple baseline design across two activity periods was used to assess the effects of reinforcing completion of a five-step packaging routine on repetitious facial hitting in one participant. The rate of facial hits decreased when teachers reduced the latency between a pause by the participant and a prompt from the teacher to continue, pauses having been observed to be followed often by sequence errors, and sequence errors by facial hitting. In Experiment 2, a reversal design was used to compare the effects on head hitting and hand biting by substituting a premeal and dining routine in a second participant. The new routine replaced a largely instructional routine that required discriminations, receptive language, and motor performances not likely to emerge in the participant's repertoire. Discontinuation of the instructional routine reduced self injury; institution of the new routine permitted the development of a highly independent series of performances without reoccurrence of self injury. The combined results of the two experiments point to the potentially evocative nature of common teaching approaches and techniques, and the habilitative effects of designing performance expectations with greater prognosis for acquisition.     

Variable preferences for sexual dimorphism in stature (SDS): Further evidence for an adjustment in relation to own height

In contemporary Western populations, some physical characteristics are sexually dimorphic, and it is known that these traits also affect human mate preferences. Height is one such characteristic, and evidence suggests that females prefer taller over shorter males, indeed, taller males have been found to have greater reproductive success. However, relative height is also important with ‘Sexual Dimorphism in Stature’ (SDS) calculated as male height/female height. Pawlowski (2003) showed that people adjust their preferences for SDS in relation to their own height in order to increase their potential pool of partners. The aim of the present study was to replicate Pawlowski’s study on a larger sample of participants, and to investigate the universality of the reported preference adjustment within European societies. We present data of 1102 men and women from three countries (Germany, Austria, and the UK) that confirm Pawlowski’s original data on a Polish sample. Moreover, the mechanism of an adjustment of SDS preferences in relation to own height was found in all three countries, suggesting that height dependent partner preference is a genuine feature in Western societies.     

Navigating two-dimensional mazes: chimpanzees (Pan troglodytes) and capuchins (Cebus apella sp.) profit from experience differently

We examined whether navigation is impacted by experience in two species of nonhuman primates. Five chimpanzees (Pan troglodytes) and seven capuchin monkeys (Cebus apella) navigated a cursor, using a joystick, through two-dimensional mazes presented on a computer monitor. Subjects completed 192 mazes, each one time. Each maze contained one to five choices, and in up to three of these choices, the correct path required moving the cursor away from the Euclidean direction toward the goal. Some subjects completed these mazes in a random order (Random group); others in a fixed order by ascending number of choices and ascending number of turns away from goal (Ordered group). Chimpanzees in both groups performed equivalently, demonstrated fewer errors and a higher rate of self-correcting errors with increasing experience at solving the mazes, and made significantly fewer errors than capuchin monkeys. Capuchins were more sensitive to the mode of presentation than chimpanzees; monkeys in the Ordered group made fewer errors than monkeys in the Random group. However, capuchins’ performance across testing changed little, and they remained particularly susceptible to making errors when the correct path required moving away from the goal. Thus, these two species responded differently to the same spatial challenges and same learning contexts. The findings indicate that chimpanzees have a strong advantage in this task compared to capuchins, no matter how the task is presented. We suggest that differences between the species in the dynamic organization of attention and motor processes contribute to their differences in performance on this task, and predict similar differences in other tasks requiring, as this one does, sustained attention to a dynamic visual display and self-produced movements variably towards and away from a goal.     

There’s more to the working memory capacity—fluid intelligence relationship than just secondary memory

The present study examined the claim that secondary memory processes account for the correlation between working memory capacity and fluid intelligence via a latent variable analysis. In the present study, participants performed multiple measures of secondary memory, working memory capacity, and fluid intelligence. Structural equation modeling suggested that both secondary memory and working memory capacity account for unique variance in fluid intelligence. These results are inconsistent with recent claims that working memory capacity does not account for variance in fluid intelligence over and above what is accounted for by secondary memory. Rather, the results are consistent with models of working memory capacity that suggest that both maintenance and retrieval processes are needed to account for the substantial relation between working memory capacity and fluid intelligence.     

The influence of motives and goal orientation on feedback seeking

This study examined the relationships between feedback seeking, goal orientation, performance and four motives which, though generally considered to underlie the feedback seeking process, have not previously been measured comprehensively. Both the likelihood and the number of instances of feedback seeking were measured in two samples (employees and students) in association with perceived or selfassessed above- and below-average performance. Self-assessed performance was a major predictor of feedback seeking; also influential were goal orientation and the goal orientation-performance interaction. Increased feedback seeking was associated with the desire for useful information motive, and reduced feedback seeking with the ego defence and defensive impression management motives. The desire for useful information motive mediated the influence of performance-prove goal orientation for employees, and that of a learning goal orientation for students.     

Memory conformity for confidently recognized items: The power of social influence on memory reports

Memory conformity occurs when one person's memory report influences another's. Memory conformity is more likely to occur when the information comes from a credible source, and when internal evidence is weak. Here, we investigate whether there are situational variations in how heavily participants weigh internal cues to accuracy when confronted with conflicting information from a partner. The results show that even confidently held memories are subject to influence from external sources, and that social influence is exaggerated when the source is seen to be highly credible.     

A tutorial on the use of excel 2010 and excel for mac 2011 for conducting delay-discounting analyses

In recent years, researchers and practitioners in the behavioral sciences have profited from a growing literature on delay discounting. The purpose of this article is to provide readers with a brief tutorial on how to use Microsoft Office Excel 2010 and Excel for Mac 2011 to analyze discounting data to yield parameters for both the hyperbolic discounting model and area under the curve. This tutorial is intended to encourage the quantitative analysis of behavior in both research and applied settings by readers with relatively little formal training in nonlinear regression.     

Delay discounting in Lewis and Fischer 344 rats: steady-state and rapid-determination adjusting-amount procedures

Lewis rats have been shown to make more impulsive choices than Fischer 344 rats in discrete-trial choice procedures that arrange fixed (i.e., nontitrating) reinforcement parameters. However, nontitrating procedures yield only gross estimates of preference, as choice measures in animal subjects are rarely graded at the level of the individual subject. The present study was designed to examine potential strain differences in delay discounting using an adjusting-amount procedure, in which distributed (rather than exclusive) choice is observed due to dynamic titration of reinforcer magnitude across trials. Using a steady-state version of the adjusting-amount procedure in which delay was manipulated between experimental conditions, steeper delay discounting was observed in Lewis rats compared to Fischer 344 rats; further, delay discounting in both strains was well described by the traditional hyperbolic discounting model. However, upon partial completion of the present study, a study published elsewhere (Wilhelm & Mitchell, 2009) demonstrated no difference in delay discounting between these strains with the use of a more rapid version of the adjusting-amount procedure (i.e., in which delay is manipulated daily). Thus, following completion of the steady-state assessment in the present study, all surviving Lewis and Fischer 344 rats completed an approximation of this rapid-determination procedure in which no strain difference in delay discounting was observed.