Does variability in human performance outweigh imprecision in response devices such as computer keyboards?

In chronometric research, it is well-known that many response devices used with personal computers, especially computer keyboards, suffer from measurement inaccuracies due to infrequent polling. In this article, it is investigated whether it is worth being concerned by this added error, given that human performance inherently exhibits a considerable degree of variability. By comparing inaccuracy due to response device imprecision with the level of variability already present in human performance, it is shown that the former is very unlikely to have a negative impact on statistical outcomes. In other words, millisecond resolution of response devices, although desirable, is not a general requirement.     

How do world-class cricket batsmen anticipate a bowler's intention?

Four experiments are reported that examine the ability of cricket batsmen of different skill levels to pick up advance information to anticipate the type and length of balls bowled by swing and spin bowlers. The information available upon which to make the predictive judgements was manipulated through a combination of temporal occlusion of the display and selective occlusion or presentation of putative anticipatory cues. In addition to a capability to pick up advance information from the same cues used by intermediate and low-skilled players, highly skilled players demonstrated the additional, unique capability to pick up advance information from some specific early cues (especially bowling hand and arm cues) to which the less skilled players were not attuned. The acquisition of expert perceptual-motor skill appears to involve not only refinement of information extraction but also progression to the use of earlier, kinematically relevant sources of information.     

The expert advantage in dynamic pattern recall persists across both attended and unattended display elements

We examined how differences in attention influence how expert and novice basketball players encode into memory the specific structural information contained within patterns of play from their sport. Our participants were primed during a typical recall task to focus attention on either attacking or defending player formations before being asked to recall the attended or unattended portion of the pattern. Adherence to the instructional set was confirmed through an analysis of gaze distributions. Recall performance was superior for the experts relative to the novices across both the attended and unattended attacking and defensive pattern structures. Expert recall of attacker positions was unchanged with and without attention, whereas recall accuracy for the positions of defenders diminished without attention, as did the novices’ recall of both attack and defense formations. The findings suggest that experienced performers are better than novices at encoding the elements from a complex and dynamic pattern in the absence of focused attention, with this advantage being especially evident in relation to the recall of attacking structure. Some revision of long-term memory theories of expertise will be necessary to accommodate these findings.     

Relational processing following stroke

The research examined relational processing following stroke. Stroke patients (14 with frontal, 30 with non-frontal lesions) and 41 matched controls completed four relational processing tasks: sentence comprehension, Latin square matrix completion, modified Dimensional Change Card Sorting, and n-back. Each task included items at two or three levels of relational complexity. Relational processing was impaired in the stroke groups. This was due mainly to items at the intermediate ternary-relational level of complexity. Less complex binary-relational items and more complex quaternary-relational items (the latter are difficult for adults generally) were less sensitive to stroke status. Impairment was greater in frontal than non-frontal stroke patients. Positive inter-correlations among measures supported the domain-general nature of relational processing. Implications for assessment and intervention are discussed.     

Islam and Christianity: On “Religions of Law”

The pursuit of mutual understanding has not infrequently led Muslims and Christians to define their religious traditions in stark doctrinal opposition one to the other. In this regard, the “religion of law” (Islam)/“religion of grace” (Christianity) dichotomy has a particularly venerable history. This article sets out to re-examine and deconstruct a couplet that would strike many as a platitude, first by giving an account of the Sunni tradition of law-generation, situated in the broad context of the many options represented by different Islamic sects, and then by revisiting the paradigmatic understanding of law in the Christian dispensation worked out by Aquinas. This exposition leads to the conclusion that any simple opposition is to be avoided at all costs, obfuscating, as it does, much more than it elucidates. Furthermore, Christianity emerges from our chosen perspective as, in some sense, more essentially a “religion of law” than Islam ever could be.     

Interacting Constraints and the Emergence of Postural Behavior in ACL-Deficient Subjects

In this study, the authors examined how task, informational, and sensorimotor system constraints influence postural control. Postural behavior of subjects with (n = 15) and without (n = 15) a key sensorimotor system constraint, anterior cruciate ligaments (ACLs) in 1 knee, was examined during 1 - and 2-legged stance with and without vision. Postural control was assessed on a commonly used postural sway meter and on a dynamic stabilometer. Data on postural sway characteristics were obtained for 30 s under 6 different conditions: standing, with eyes open and closed, on both legs, on the injured leg, and on the noninjured leg. The interaction of task, informational, and sensorimotor constraints was observed only on the dynamic stabilometer and not the postural sway meter. Vision was the most important informational constraint on postural control for subjects on the dynamic stabilometer, particularly for the ACL-deficient group standing on the injured leg. Under more static task constraints, ACL deficiency did not prove a significant disadvantage, because vision was confirmed as a significant source of exproprioceptive information. The results support the functionality of using dynamic tasks such as a stabilometer in assessing postural behavior of subjects with sensorimotor system constraints.     

A process-dissociation examination of the cognitive processes underlying unconscious thought

Conscious and unconscious thought have been previously found to differentially impact decision-making quality. However, little research has directly measured the processes underlying these modes of thinking. We propose that both thinking modes are characterized by rule-based and intuitive processing. In two experiments, we used the Process Dissociation Procedure to independently measure these cognitive processes. We tested three competing hypotheses: (a) conscious thinking evokes both increased rule-based and decreased intuitive processing compared to unconscious thinking; (b) conscious and unconscious thinking evoke similar levels of intuitive processing but conscious thinking enhances rule-based processing; and (c) conscious and unconscious thinking evoke similar levels of rule-based processing but unconscious thinking enhances intuitive processing. Experiment 1 used base-rate and law-of-large-numbers decision-making problems, whereas Experiment 2 used decision-making problems similar to the “apartment” problem that is often used in unconscious thought studies. In both experiments we found support for hypothesis (b).     

Impact of phonology on the generation of handwritten responses: Evidence from picture-word interference tasks

State Key Laboratory of Brain and Cognitive Sciences, Chinese Academy of Sciences, Beijing, China The degree to which phonological codes constrain handwriting is at present controversial. Two experiments used a picture-word interference paradigm in which participants wrote down the names of pictures while attempting to ignore visual distractor words presented at various time intervals (SOAs). Distractors could be orthographically and phonologically related, orthographically related only, or unrelated. We found an exclusive effect of phonology at an early SOA, and orthographic priming at a later SOA. In a second experiment, we showed that the effect of phonology was diminished when writers engaged in concurrent articulatory suppression. The results suggest a role of phonology in the generation of handwritten words that is to some extent dependent on situational circumstances.