Haptic integration of object properties: texture, hardness, and planar contour

Planar objects varying in shape, texture, and hardness were classified under haptic exploration. Classes were defined by values on one dimension, or redundantly, by two or three dimensions. Response times and exploratory procedures (Lederman & Klatzky, 1987) were recorded. Experiment 1 showed that a second dimension speeded responses for all combinations (redundancy gain), but a third dimension produced no further effect. In Experiments 2 and 3, classification trials began with two redundant dimensions, and subsequently one was withdrawn (held constant). When texture and hardness varied redundantly, withdrawal of either increased response time--even when subjects were initially instructed to focus on one dimension. Joint exploration for texture and hardness dominated whenever the two varied redundantly and persisted despite withdrawal. Redundancy gains (Experiment 1), but not substantial withdrawal effects (Experiments 2 and 3), were observed for combinations of texture or hardness with planar contour, indicating less integration than between substance dimensions. Compatibility of exploratory procedures appears to constrain dimensional integration.     

An acceptance-based behavioral intervention for weight loss: a pilot study

On average, participants in behavioral weight-loss interventions lose 8 kilograms (kg) at 6 months, but there is marked variability in outcomes with some participants losing little or no weight. Individuals with difficulties with internal disinhibition (i.e., eating in response to emotions or thoughts) typically lose less weight in such programs and may require an innovative, specialized approach. This pilot study examined the preliminary acceptability and efficacy of a 24-week acceptance-based behavioral intervention for weight loss among overweight and obese adults reporting difficulty with eating in response to emotions and thoughts. Participants were 21 overweight or obese men and women (mean age=52.2±7.6 years; baseline mean body mass index=32.8±3.4). Eighty-six percent completed the 6-month program and a 3-month follow-up assessment. Ratings of program satisfaction averaged 4.9 on a five-point scale. Multilevel modeling analyses indicated participants lost an average of 12.0 kg (SE=1.4) after 6 months of treatment and 12.1 kg (SE=1.9) at 3-month follow-up, thus exceeding the weight losses typically seen in behavioral treatment programs. Decreases in internal disinhibition and weight-related experiential avoidance were found at 6- and 3-months follow-up. Greater decreases in weight-related experiential avoidance were associated with greater weight loss at the end of the program (r=.64, p=.002), suggesting a potential mechanism of action. Although there have been a few preliminary studies using acceptance-based approaches for obesity, this is the first study to specifically target emotional overeaters, a subgroup that might be particularly responsive to this new approach. Our findings provide initial support for the feasibility, efficacy, and acceptability of this approach for this subgroup of participants. Further study with longer follow-up, a more diverse sample, and comparison to a standard behavioral program is clearly warranted.     

Revaluation manipulations produce emergence of underselected stimuli following simultaneous discrimination in humans

Stimulus overselectivity occurs when only one of potentially many aspects of the environment controls behaviour. In four experiments, human participants were trained and tested on a trial-and-error simultaneous discrimination task involving two two-element compound stimuli. Overselectivity emerged in all experiments (i.e., one element from the reinforced compound controlled behaviour at the expense of the other). Following revaluation (extinction) of the previously overselected stimulus, behavioural control by the underselected stimulus element emerged without any direct training of that stimulus element. However, while a series of extinction manipulations targeting the revaluation of the overselected stimulus produced differential extinction of that stimulus, they did not result in differential emergence of the previously underselected stimuli. The results are discussed with respect to the theoretical implications for attention-based accounts of overselectivity.     

Relative contributions of face and body configurations: perceiving emotional state and motion intention

This study addressed the relative reliance on face and body configurations for different types of emotion-related judgements: emotional state and motion intention. Participants viewed images of people with either emotionally congruent (both angry or fearful) or incongruent (angry/fearful; fearful/angry) faces and bodies. Congruent conditions provided baseline responses. Incongruent conditions revealed relative reliance on face and body information for different judgements. Body configurations influenced motion-intention judgements more than facial configurations: incongruent pairs with angry bodies were more frequently perceived as moving forward than those with fearful bodies; pairs with fearful bodies were more frequently perceived as moving away. In contrast, faces influenced emotional-state judgements more, but bodies moderated ratings of face emotion. Thus, both face and body configurations influence emotion perception, but the type of evaluation required influences their relative contributions. These findings highlight the importance of considering both the face and body as important sources of emotion information.     

Retest learning in the absence of item-specific effects: Does it show in the oldest-old?

This study examined whether the nonitem-specific retest learning effects, previously shown with young-old adults primarily in their 60s and 70s, could be extended to oldest-old adults aged 80 and onward. Twenty-one oldest-olds participated in an 8-session retest training program with three ability domains: perceptual speed, inductive reasoning, and visual attention. Their data were compared with the data of 30 young-olds collected in a previous work (Yang, Reed, Russo, & Wilkinson, 2009). The two age groups showed largely equivalent retest learning effects. In addition, only young-olds were able to benefit from item-specific retest learning, specifically in reasoning and perceptual speed tests. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

‘Murder by Milligrams’: Enhancement Technologies and Therapeutic Zeal in Timothy Findley’s Headhunter”

In his 1993 novel Headhunter, Canadian author Timothy Findley describes the tendency of some medical practitioners to put scientific interests above the therapeutic needs of the individual. As the book's title and name of the main character Dr. Kurtz attest, Findley reflects the colonialist teleology found in Heart of Darkness as an analogue for the therapeutic zeal shown by many of the physicians in Headhunter. In the novel, such zeal is especially problematic when it is combined with so-called enhancement technologies, since enhancement, like colonialism, can be based in the prejudices of the practitioner and/or the dominant society, rather than in the needs of the patient. To counter therapeutic zeal, Findley, like Conrad, proposes an ethics of restraint in which the practitioner's empathy outweighs his or her desire for scientific discovery.