Cognitive load of navigating without vision when guided by virtual sound versus spatial language

A vibrotactile N-back task was used to generate cognitive load while participants were guided along virtual paths without vision. As participants stepped in place, they moved along a virtual path of linear segments. Information was provided en route about the direction of the next turning point, by spatial language ("left," "right," or "straight") or virtual sound (i.e., the perceived azimuth of the sound indicated the target direction). The authors hypothesized that virtual sound, being processed at direct perceptual levels, would have lower load than even simple language commands, which require cognitive mediation. As predicted, whereas the guidance modes did not differ significantly in the no-load condition, participants showed shorter distance traveled and less time to complete a path when performing the N-back task while navigating with virtual sound as guidance. Virtual sound also produced better N-back performance than spatial language. By indicating the superiority of virtual sound for guidance when cognitive load is present, as is characteristic of everyday navigation, these results have implications for guidance systems for the visually impaired and others.     

How great apes perform on a modified trap-tube task

To date, neither primates nor birds have shown clear evidence of causal knowledge when attempting to solve the trap tube task. One factor that may have contributed to mask the knowledge that subjects may have about the task is that subjects were only allowed to push the reward away from them, which is a particularly difficult action for primates in certain problem solving situations. We presented five orangutans (Pongo pygmaeus), two chimpanzees (Pan troglodytes), two bonobos (Pan paniscus), and one gorilla (Gorilla gorilla) with a modified trap tube that allowed subjects to push or rake the reward with the tool. In two additional follow-up tests, we inverted the tube 180° rendering the trap nonfunctional and also presented subjects with the original task in which they were required to push the reward out of the tube. Results showed that all but one of the subjects preferred to rake the reward. Two orangutans and one chimpanzee (all of whom preferred to rake the reward), consistently avoided the trap only when it was functional but failed the original task. These findings suggest that some great apes may have some causal knowledge about the trap-tube task. Their success, however, depended on whether they were allowed to choose certain tool-using actions. Electronic Supplementary Material Supplementary material is available for this article at     

The acceptability and preference for the psychological treatment of PTSD

The acceptability and preference of psychological treatments is important in understanding patient treatment seeking, choice, engagement and attrition and possibly treatment response in health care. The acceptability of, and preference for, 14 different types of psychological treatment for posttraumatic stress disorder (PTSD) were investigated in a student population through invitation to participate in a web-based survey. Respondents were asked to rate each treatment on 10 scales and to rank the treatments in order of preference. Respondents were also asked whether they would seek treatment themselves, recommend treatment to friends and family, feel stigmatised by suffering from PTSD, had any prior knowledge of the treatments and if this had been positive or negative and whether they had a history of psychological problems or treatment. A total of 330 respondents completed the survey. A past or current history of psychological problems and treatment was surprisingly high. Almost all respondents indicated that they would seek or recommend treatment in spite of high levels of stigmatisation. Factor analysis of the 10 scales indicated two factors: Endorsement and Discomfort. Rank ordering on preference and Endorsement scores was highly consistent. The highly preferred and endorsed treatments involved cognitive therapy, exposure or psycho-education in spite of high levels of discomfort anticipated with exposure. Treatments involving new technologies, EMDR and psychodynamic psychotherapy received the lowest Endorsement and preference. There was a modest influence of prior knowledge of a treatment.     

Group treatment for trichotillomania: behavior therapy versus supportive therapy

In this randomized controlled trial, group behavior therapy (BT; n = 12) was compared to group supportive therapy (ST; n = 12) in the treatment of trichotillomania (TTM). Both treatments were also compared to a naturally occurring waiting period, the time period that participants waited for groups to form. Participants completing group BT experienced significantly greater decreases in self-reported hair-pulling symptoms and clinician-rated hair loss severity than did those in group ST. Decreases were significantly greater after treatment than after the naturalistic waiting period. In addition, a significantly higher percentage of those in the BT than ST condition were rated as much improved or very much improved on the Clinical Global Impression scale at posttreatment. However, despite substantial symptom improvement, TTM severity remained problematic at posttreatment. Specifically, few participants in either treatment met criteria for clinically significant change at posttreatment. In addition, relapse of symptoms occurred over the 6-month follow-up period. Results provided partial support for the short-term efficacy of group BT. However, the group format may not maximize the efficacy of BT for TTM. Thus, it is recommended that future BT research test either individual therapy or a combination of group and individual formats for TTM.     

Processing mode influences the relationship between trait rumination and emotional vulnerability

Watkins (2004) found that the mode of processing adopted during expressive writing following a failure influenced emotional recovery from the failure as a function of level of trait rumination. At higher levels of trait rumination, negative mood 12 hours after the failure was greater, but only in an abstract, evaluative writing condition and not in a concrete, process-focused condition. The current study examined whether this interaction of trait rumination with processing mode would generalize to emotional vulnerability to a subsequent negative stressor. Participants repeatedly focused on both positive and negative scenarios in either a concrete, process-focused or an abstract, evaluative mode, before a failure experience. As predicted, after the failure experience, higher levels of trait rumination were associated with lower levels of positive affect, but only for participants in the abstract, evaluative condition and not for participants in the concrete, process-focused condition. This finding is consistent with processing mode influencing the relationship between trait rumination and emotional vulnerability.     

Kinematic assessment of treadmill running using different body-weight support harnesses

10 male collegiate runners (M age = 21.4, SD = 1.5 yr.) ran on a treadmill with no body-weight support (BWS), 20% BWS, and 40% BWS conditions. In addition, they wore three different commercially available harnesses at the 20% and 40% BWS conditions. The aim was to run on the treadmill at a fast speed while maintaining an adequate step length. The purpose was to investigate how each harness changed running gait, and the differences in running gait between the harnesses with various body-weight support. Analysis of variance indicated significant restriction of upper body torso rotation between the harnesses at the 40% BWS conditions. Body-weight support resulted in a longer stride, decreased cadence, less vertical displacement of the center of mass, and diminished hip and ankle joint excursions. These changes indicated that increased body-weight support results in longer steps with the foot contacting the belt for a shorter period of time with less leg angular changes throughout the running cycling.     

Goal pursuit, goal self-concordance, and the accessibility of autobiographical knowledge

Recent theory suggests that personal goals influence the accessibility of autobiographical knowledge. We suggest that this effect is moderated by goal self-concordance: the extent to which a goal is pursued for autonomous rather than controlling reasons. Cueing paradigms were used to measure the accessibility of autobiographical knowledge relating to (i) goals that participants were and were not pursuing, and (ii) currently pursued goals that were high and low in self-concordance. As predicted, autobiographical knowledge relating to currently pursued goals was more accessible than autobiographical knowledge relating to non-pursued goals. General event knowledge relating to self-concordant goals was more accessible than general event knowledge relating to non-self-concordant goals, but a corresponding relationship did not emerge for event-specific knowledge.