Investigating the Constrained Action Hypothesis: A Movement Coordination and Coordination Variability Approach

The purpose of this study was to examine the effects of focus of attention cues on movement coordination and coordination variability in the lower extremity. Twenty participants performed the standing long jump under both internal and external focus of attention conditions. A modified vector coding technique was used to evaluate the influence of attentional focus cues on lower extremity coordination patterns and coordination variability during the jumps. Participants jumped significantly further under an external focus of attention condition compared with an internal focus of attention condition (p = .035, effect size = .29). Focus of attention also influenced coordination between the ankle and knee, F(6, 19) = 2.87, p = .012, effect size = .388, with participants primarily using their knees under the internal focus of attention, and using both their ankles and knees under the external focus of attention. Attentional focus cues did not influence ankle-knee, F(1, 19) = 0.02, p = .98, effect size = .02, or hip-knee, F(1, 19) = 5.00, p = .49, effect size = .16, coordination variability. Results suggest that while attentional focus may not directly influence movement coordination condition, there is still a change in movement strategy resulting in greater jump distances following an external focus of attention.     

Solitude without Souls: Why Peter Unger hasn’t Established Substance Dualism

Unger has recently argued that if you are the only thinking and experiencing subject in your chair, then you are not a material object. This leads Unger to endorse a version of Substance Dualism according to which we are immaterial souls. This paper argues that this is an overreaction. We argue that the specifically Dualist elements of Unger’s view play no role in his response to the problem; only the view’s structure is required, and that is available to Unger’s opponents. We outline one such non-Dualist view, suggest how to resolve the dispute, respond to some objections, and argue that ours is but one of many views that survive Unger’s challenge. All these views are incompatible with microphysicalism. So Unger’s discussion does contain an insight: if you are the only conscious subject in your chair, then microphsyicalism is false. Unger’s mistake was to infer Substance Dualism from this; for microphysicalism is not the only alternative to Dualism.     

Microcomputerized clinical and research laboratories in psychiatric inpatient,settings

Microcomputers have become increasingly useful in clinical settings, performing functions ranging from test administration to composition of narrative reports. They may in the near future be involved in therapeutic procedures. Clinicians and researchers have begun to wonder whether a microcomputer can take over a wide range of functions in clinical psychiatric settings, becoming a versatile and cost-effective tool. This paper describes the development of a comprehensive system for research and clinical data management on a psychiatric inpatient unit. The core of the system is an Apple II-Plus microcomputer equipped with PASCAL, standard peripherals, and an inexpensive custom interface. The system has met the current data management needs of the unit, and its expandability allows planning of assessment-and treatment-related research.     

Potential Symptoms of ADHD for Emerging Adults

To identify potential diagnostic criteria for Attention-Deficit/Hyperactivity Disorder (ADHD) in emerging adults using a combination of DSM-IV and Barkley, Murphy, and Fischer’s (2007) executive functioning (EF) items. Participants in ADHD and control groups self-report on: (1) the 18 DSM-IV criteria, (2) 87 Barkley et al. (2007) EF items, and (3) 10 impairment items. Factor analyses, expert ratings, and logistic regression analyses reveal two factors named Cognitive Inflexibility (CI) and Disinhibition (DI) that have potential diagnostic utility. Confirmatory factor analyses and further regression analyses reveal that specific DSM-IV items and items from CI and DI factors account for unique variance in self-reported impairment. Therefore, a 17-item set consisting of CI and DI items is proposed for further study. Reflecting the developmental nature of ADHD, a novel set of 17 items is shown to have potential diagnostic utility for emerging adults.     

Contextual interference and augmented feedback: is there an additive effect for motor learning?

Learning to perform a skilled behavior is affected by the context of the practice session and the frequency of augmented feedback. We studied the combined effect of these variables in the acquisition of a ballistic, bi-directional lever movement pattern involving four different target locations as measured by performance in practice, retention, and transfer tests. Augmented feedback was presented in either an every-trial or a faded schedule during random and blocked practice. Consistent with the contextual interference effect, the blocked practice group produced lower errors in acquisition, but the random practice group outperformed the blocked practice group in both retention and transfer. In contrast, faded feedback did not have a beneficial effect on learning and degraded learning when provided during blocked practice. While the results were consistent with previous findings of random and blocked practice, they were not consistent with previous findings of reduced feedback frequencies.