Examination of relationships among trait-like individual differences, state-like individual differences, and learning performance

Several authors (e.g., J.T. Austin & H.J. Klein, 1996; R. Kanfer, 1990b, 1992) have urged researchers to examine comprehensive models of distal individual differences as predictors of proximal motivational processes and performance. Two field studies in an academic setting tested a model of relationships among trait-like individual differences (cognitive ability, general self-efficacy, and goal orientation), state-like individual differences (state anxiety, task-specific self-efficacy, and goals), and learning performance. Most hypothesized relationships among these constructs received support when tested on 2 samples, when examining different performance episodes, and when using different goal orientation and state-anxiety measures. In general, state-like individual differences were found to mediate the relationships between trait-like individual differences and learning performance. Implications of these results are discussed and suggestions for future research are provided.     

Risky prospects and risk aversion tendencies: does competition in the classroom depend on grading practices and knowledge of peer-status?

When students are faced with the decision of whether to assist a peer, they should be sensitive to the potential risks associated with doing so. Two factors associated with risky helping behaviour in the classroom are: (1) the grading practices that are used, and (2) knowledge of a peer’s relative status. Normative (“curved”) grading creates a situation in which peer-interactions are potentially competitive, but it is only those interactions with peers of a similar status that carry the potential for assistance to be costly to oneself. In two studies, we created hypothetical scenarios in which the grading practices (normative or absolute) and peer-status proximity (proximate, distant, or unknown) were manipulated, and asked participants to report their willingness to cooperate with a peer by sharing their notes from an important lecture. We found that when normative grading was used, individuals were less willing to assist a peer when they knew that the peer’s status was proximate to their own. There was also less cooperation when peer status was unknown, under normative grading, which is consistent with a risk-aversion tendency.     

The Structure of Life History: Implications for the Construct Validity of Background Data Scales

Background data measures have proven to be effective predictors of a variety of criteria. Little attention, however, has been given to the substantive princi- ples underlying their application. In this article, we present a model for un- derstanding the structure of differential life history. This model was used subsequently to generate a substantial framework for applying background data measures. These principles were used then to address various issues bear- ing on construct definition, item generation, and performance prediction. It was concluded that systematic application of construct validation principles may do much to enhance the utility of background data scales.     

Action-centred negative priming: Evidence for reactive inhibition

Experiments are described in which the spatial relationship between a stimulus and respondent is held constant in terms of visual and body-centred coordinates, while the complexity of the response is manipulated. It is demonstrated that the degree of complexity of an action directed to the same spatial location determines the level of negative priming observed. This result supports the notions that (1) inhibitory selection mechanisms act on action-centred representations, and (2) the level of inhibition is reactive to the relative potency of the evoked action. The results are also discussed in terms of alternative explanations of negative priming. It is concluded that the results are inconsistent with theories that do not involve inhibitory selection mechanisms.     

The effect of the Müller-Lyer illusion on the planning and control of manual aiming movements

Two experiments used Müller-Lyer stimuli to test the predictions of the planning-control model (S. Glover, 2002) for aiming movements. In Experiment 1, participants aimed to stimuli that either remained the same or changed upon movement initiation. Experiment 2 was identical except that the duration of visual feedback for online control was manipulated. The authors found that the figures visible during movement planning and online control had additive effects on endpoint bias, even when participants had ample time to use visual feedback to modify their movements (Experiment 2). These findings are problematic not only for the planning-control model but also for A. D. Milner and M. A. Goodale's (1995) two visual system explanation of illusory bias. Although our results are consistent with the idea that a single representation is used for perception, movement planning, and online control (e.g., V. H. Franz, 2001), other work from our laboratory and elsewhere suggests that the manner in which space is coded depends on constraints associated with the specific task, such as the visual cues available to the performer.     

Whose Life Task Is It Anyway? Social Appraisal and Life Task Pursuit

The study uses a social contextual framework to examine how others are represented in individuals' life task appraisals and how such appraisals are related to strategies to pursue those life tasks. The extent to which life tasks nominated by 81 college students (45 females) were appraised as shared with others and pursued collaboratively was examined through a questionnaire. Participants listed five life tasks, indicated if each life task was theirs alone, indirectly shared (others were impacted by their life task pursuit), or directly shared (another person might also nominate the life task as theirs) with others in their lives, described three activities used to pursue their life tasks, and coded how others were involved inthese activities. Results indicated that the majority of college students' life tasks were appraised as involving others, that directly shared appraisals were found more frequently in the relationship domain, and that directly shared appraisals were associated with collaborative life task pursuit strategies. In addition, appraising life tasks as directly shared did not appear to reflect aspects of anxiety or compensation. A content analysis of the strategies coded as involving other individuals revealed diverse ways in which others are involved in life task pursuit ranging from active engagement of others to cognitive strategies where others are implied. The findings have implications for research on life tasks and other goal structures in that the structures may involve the social context in adaptive ways.     

Unequal weighting of monocular inputs in binocular combination: implications for the compression of stereoscopic imagery

For efficient storage and transmission of stereoscopic images over bandwidth-limited channels, compression can be achieved by degrading 1 monocular input of a stereo pair and maintaining the other at the desired quality. The desired quality of the fused stereoscopic image can be achieved, provided that binocular vision assigns greater weight to the nondegraded input. A psychophysical matching procedure was used to determine if such over-weighting occurred when the monocular degradation included blur or blocking artifacts. Over-weighting of the nondegraded input occurred for blur, but under-weighting of the nondegraded input occurred for blockiness. Some participants exhibited ocular dominance, but this did not affect the blur results. The authors conclude that blur, but not blockiness, is an acceptable form of monocular degradation.