The effects of curvature on haptic judgments of extent in sighted and blind people

A series of experiments was carried out to examine the effect of curvature on haptic judgments of extent in sighted and blind individuals. Experiment 1 showed that diameters connecting the endpoints of semicircular lines were underestimated with respect to straight lines, but failed to show an effect of visual experience on length judgments. In experiment 2 we tested are lengths. The effects of curvature on perceived path length were weaker, but were still present in this experiment. Visual experience had no effect on path length judgments. Another experiment was performed to examine the effect of repeated tracing (1, 5, 9, or unlimited number of traces) on judgments of the lengths of straight lines and diameters of semicircles. Judgments of extent were more accurate when subjects engaged in larger numbers of traces. There was no effect of number of traces on curve-height judgments, suggesting that subjects were not using height estimates to judge diameters of semicircles. In a further experiment we tested the effect of number of traces on curves that varied in height. Restricting subjects to a single trace magnified the effect of path length on judgments of the distance between the endpoints of curves. Additional experiments showed that curvature effects on diameter judgments were not eliminated when stimuli were in the frontal plane or when the curves were explored with the use of two hands. Arm support had no effect on judged length in experiment 7. A final experiment showed a robust horizontal vertical illusion in haptic perception of convex curves, with overestimation of the heights of the curves compared with their widths. The practical and theoretical implications of the results are discussed.     

Expanding the Psychological Imagination in Pastoral Theology: Using Novels to Better Understand Underrepresented Persons and Groups

This essay argues for the effectiveness of using novels to develop a more sophisticated pastoral imagination by discussing the unique contributions the novel can make to pastoral care and using Toni Morrison’s (1998) novel Paradise to demonstrate the power of the novel to expand the author’s own pastoral imagination. Themes the novel raises include the contextual nature of human experience; the value of cultural theories for deeper and more penetrating analyses of human experience than those provided by psychological theories alone; and the resources available among victims of oppression and abuse for communal healing. The essay concludes with a discussion of the lessons that novels and, in particular, Morrison’s Paradise, have to teach pastoral theologians.     

Meta-analytic Decisions and Reliability: A Serendipitous Case of Three Independent Telecommuting Meta-analyses

Purpose  

Despite the potential for researcher decisions to negatively impact the reliability of meta-analysis, very few methodological studies have examined this possibility. The present study compared three independent and concurrent telecommuting meta-analyses in order to determine how researcher decisions affected the process and findings of these studies.     

The dark side of Absorption: Empirical associations between an experiential response style and hypochondriacal concerns

We examined associations between hypochondriacal concerns and the personality dimensions of Absorption and Negative Emotionality (NE). On the basis of research suggesting that Absorption is associated with both negative and positive affective experiences, we hypothesized that participants with high levels of Absorption and NE would report higher levels of hypochondriacal concerns. A sample of 212 undergraduates completed a set of self-report measures assessing Absorption, NE, and aspects of hypochondriacal concerns. Results provide preliminary but mixed evidence that Absorption relates positively to certain hypochondriacal concerns, in some cases by means of interactions with NE.     

Effect of drugs on response-duration differentiation VII: response-force requirements

Rats were trained to press a lever for at least 1 s but for less than 1.3 s. The force required to press the lever was then increased or decreased by 10, 15, or 20 g. Increases in the force requirements for lever pressing decreased timing accuracy, but decreases in the force requirement had the opposite effect. Accuracy decreases at increasing force requirements were characterized by an increase in the relative frequency of responses that were too short to meet the reinforcement criterion. In contrast, increases in accuracy when the force requirements were decreased were characterized by increases in response durations that met the reinforcement criterion and decreases in the relative frequency of responses that were too short to produce the reinforcer. Phencyclidine (PCP) and methamphetamine produced dose-dependent decreases in accuracy that were associated primarily with increases in the relative frequency of short response durations, although methamphetamine also produced increases in long response durations at some doses. When the effects of PCP were determined with the force requirement increased by 10 g or decreased by 15 g, the cumulative response-duration distribution shifted toward even shorter response durations. When the effects of methamphetamine were determined with the force requirement on the lever increased by 10 g, the cumulative frequency distribution was shifted toward shorter response durations to about the same extent as it had been before force requirements increased; however, when the force required to press the lever was decreased by 15 g, these shifts toward shorter response durations almost completely disappeared. These results show that increases and decreases in the force requirements for lever pressing have different effects on the accuracy of temporal response differentiation.     

Parental Anxiety Disorders, Child Anxiety Disorders, and the Perceived Parent–Child Relationship in an Australian High-Risk Sample

This study was designed to explore the role of perceived parenting behavior in the relationship between parent and offspring anxiety disorders in a high-risk sample of adolescents. We examined the relationship between parental and child anxiety disorders and tested whether perceived parenting behavior acted as a mediator between these variables. Analyses were performed on a high-risk sample of 816 fifteen-year-olds drawn from a birth cohort in Queensland, Australia. Parental depression and income were covaried. Maternal anxiety disorder significantly predicted the presence of anxiety disorders in children; the association between paternal anxiety disorder and child anxiety disorder was not significant. There was no evidence that perceived parenting played a mediating role in the association between mother and child anxiety disorders. These results replicate earlier studies' findings of elevated rates of anxiety disorders among the offspring of anxious parents, but only when the child's mother is the anxious parent.     

Are goals or preconditions better explanations? It depends on the question

Recent research on causal inference suggests that common actions tend to be attributed to goals, whereas difficult actions, if obstructed, are attributed primarily to preconditions. The present studies examine the way that the framing of causal questions influences ratings of goals and preconditions for common actions. The studies test the view that ‘why’ questions favour goal explanations, by presenting causal questions framed as ‘why’ questions or ‘explain’ questions. Structured and free-response measures were used. They show that when the question is expressed as asking why an action occurs, goals are rated better than preconditions, regardless of the presence of obstacles, whereas if the question is framed as requesting an explanation of the action, preconditions are deemed better explanations than goals for obstructed actions. Goals remain better explanations when the action is unobstructed. These findings confirm the importance of the framing of causal questions for research on causal explanation, and suggest that the phrasing of causal questions influences the focus of explanations. Copyright © 1998 John Wiley & Sons, Ltd.     

How information about building design influences causal attributions for earthquake damage

Causal attributions for events are shaped by information about causal mechanisms that contribute to the events. In the case of damage from earthquakes, these mechanisms include the design of buildings. Three studies presented scenarios drawn from actual reports of recent earthquakes (Kobe, Japan and Northridge, California, USA), including statements by engineers about the quality of the design of damaged and undamaged buildings. Studies examined whether this design information affected attributions for earthquake damage. Participants attributed damage to building design more strongly and rated damage more preventable when scenarios referred to the poor building design of damaged buildings than when scenarios gave no design information. Information about the excellent design of undamaged buildings had less consistent effects. This effect was most consistent with scenarios about the design of damaged buildings. These findings show that mechanism (design) information does influence judgments about damage in earthquakes and, by implication, other hazards.     

The Wick in the Candle of Learning: Epistemic Curiosity Activates Reward Circuitry and Enhances Memory

ABSTRACT— Curiosity has been described as a desire for learning and knowledge, but its underlying mechanisms are not well understood. We scanned subjects with functional magnetic resonance imaging while they read trivia questions. The level of curiosity when reading questions was correlated with activity in caudate regions previously suggested to be involved in anticipated reward. This finding led to a behavioral study, which showed that subjects spent more scarce resources (either limited tokens or waiting time) to find out answers when they were more curious. The functional imaging also showed that curiosity increased activity in memory areas when subjects guessed incorrectly, which suggests that curiosity may enhance memory for surprising new information. This prediction about memory enhancement was confirmed in a behavioral study: Higher curiosity in an initial session was correlated with better recall of surprising answers 1 to 2 weeks later.