The composition of imaginal transformations

Three experiments examine the performance of composite imaginal spatial transformations using tasks in which people perform pairs of distinct imaginal transformations either in close succession or simultaneously. The principal aim of the investigation is to determine, for both modes of composition, whether imaginal transformations combine interactively or noninteractively to determine the temporal course of imaging performance. Specifically, does the time to imagine a given composite transformation reflect the independent contributions of its component transformations, or do component transformations have different effects within different composites? Results obtained under a number of distinct task conditions are most consistent with the proposal of noninteractive composition. However, the temporal effects of particular imaginal transformations are neither consistent nor readily predictable across different task conditions. Implications of these results for analogue-spatial models, task demand, and procedural accounts of imaging are discussed.     

Recency discrimination predicted from absolute lag judgments

An experiment is described which tests the plausibility of the assumption that two-alternative forced-choice (2AFC) recency discrimination is based on an independent lag estimate of each item. 39 Ss made absolute recency judgments for items (common nouns) at varying lag intervals while an independent group of 74 Ss made 2AFC judgments for pairs of items at comparable lag combinations. It was found that the absolute judgment data generated accurate predictions of 2AFC performance.     

A comparison of four approaches to account for method effects in latent state-trait analyses

Latent state-trait (LST) analysis is frequently applied in psychological research to determine the degree to which observed scores reflect stable person-specific effects, effects of situations and/or person-situation interactions, and random measurement error. Most LST applications use multiple repeatedly measured observed variables as indicators of latent trait and latent state residual factors. In practice, such indicators often show shared indicator-specific (or method) variance over time. In this article, the authors compare 4 approaches to account for such method effects in LST models and discuss the strengths and weaknesses of each approach based on theoretical considerations, simulations, and applications to actual data sets. The simulation study revealed that the LST model with indicator-specific traits (Eid, 1996) and the LST model with M - 1 correlated method factors (Eid, Schneider, & Schwenkmezger, 1999) performed well, whereas the model with M orthogonal method factors used in the early work of Steyer, Ferring, and Schmitt (1992) and the correlated uniqueness approach (Kenny, 1976) showed limitations under conditions of either low or high method-specificity. Recommendations for the choice of an appropriate model are provided.     

Moral Luck and the Possibility of Agential Disjunctivism

Most presentations of the problem of moral luck invoke the notion of control, but little has been said about what control amounts to. We propose a necessary condition on an agent's having been in control of performing an action: that the agent's effort to perform the action ensured that the agent performed the action. The difficulty of satisfying this condition (or one like it) leads many on both sides of the moral luck debate to conclude that much of what we do is not within our control, and, at the limit, underpins agential skepticism, the view that no one has ever been in control of having performed an action in the external world. We propose a response to the agential skeptic modeled on the epistemological disjunctivist's response to the skeptic about perceptual experience. According to agential disjunctivism, the necessary condition on control can be met, thus undermining agential skepticism and one motivation for the problem of moral luck. Our view can be understood as resisting moral luck not by shrinking the domain of robust moral evaluation but by refusing to contract the realm of robust control.     

Rogers' 'Necessary and Sufficient Conditions' Revisited

Rogers' concept of the 'necessary and sufficient' conditions of therapeutic personality change is introduced and the research evidence concerning the efficacy of the core conditions is reviewed. The use of Truax-and-Carkhuff-type rating scales for measuring the conditions is criticised on the grounds of inadequate validity and sampling procedure. It is suggested that relationship inventories such as those produced by Barnett-Lennard (1962) appear to be better suited to test Rogers' position, although it is conceded that Rogers' hypotheses are in need of some revision.     

Conceptual transfer insimple insight problems

Three experiments explored the conditions under which information presented in the first part of an experiment facilitates the subsequent solving of simple insight problems. We argue that previous unsuccessful attempts to obtain such facilitation are attributable to the experimenters’ failure to present this information in a form that induces the conceptual operations needed to solve the problem. Substantial facilitation is obtained if the information is presented in a form that induces a few seconds of puzzlement and then a clue is presented that leads to an appropriate reconception; if identical information is presented without such a period of puzzlement and reconception, no facilitation is observed. The results demonstrate that conceptual processing operations, not merely informational content, must be relevant if conceptual transfer is to occur. One possible mechanism involved in such transfer is the indexing of concepts such that they contain pointers to conceptually anomalous episodes     

A daytime nap enhances visual working memory performance and alters event-related delay activity

Working memory (WM) is impaired following sleep loss and may be improved after a nap. The goal of the current study was to better understand sleep-related WM enhancement by: (1) employing a WM task that assesses the ability to hold and report visual representations as well as the fidelity of the reports on a fine scale, (2) investigating neurophysiological properties of sleep and WM capacity as potential predictors or moderators of sleep-related enhancement, and (3) exploring frontal and occipital event-related delay activity to index the neural processing of stimuli in WM. In a within-subjects design, 36 young adults (M_age = 20, 20 men, 16 women) completed a 300-trial, continuous-report task of visual WM following a 90-min nap opportunity and an equivalent period of wakefulness. Mixed-effect models were used to estimate the odds of successful WM reports and the fidelity of those reports. The odds of a successful report were approximately equal between nap and wake conditions for the start of the task, but by the end, the odds of success were 1.26 times greater in the nap condition. Successful WM reports were more accurate after a nap, independent of the time on task. Neither WM capacity nor any of the sleep variables measured were found to significantly moderate the nap effect on WM. Lastly, napping resulted in amplitude changes for frontal and occipital delay activity relative to the wake condition. The findings are discussed in relation to contemporary models of visual WM and the role of sleep in sustained attention.     

Spontaneous skepticism: the interplay of motivation and expectation in responses to favorable and unfavorable medical diagnoses

The quantity of processing view of motivated reasoning predicts that individuals are more likely to spontaneously question the validity of unfavorable than favorable feedback even when the objective likelihood of the feedback is equivalent. Participants were videotaped self-administering a bogus medical test revealing either a favorable or an unfavorable result. In Studies 1 and 2, unfavorable result participants required more time to accept the validity of the test result and were more likely to spontaneously recheck its validity than were favorable result participants. However, unfavorable results also were perceived as less expected than were favorable results, even though the information supplied about their objective likelihood was identical. Study 3 showed that participants evaluating another student's results perceived favorable and unfavorable outcomes as equally likely, suggesting that the subjective likelihood of positive and negative feedback is also subject to motivational influence.