Weber (Slope) Analyses of Timing Variability in Tapping and Drawing Tasks

Timing variability in continuous drawing tasks has not been found to be correlated with timing variability in repetitive finger tapping in recent studies (S. D. Robertson et al., 1999; H. N. Zelaznik, R. M. C. Spencer, & R. B. Ivry, 2002). Furthermore, the central component of timing variability, as measured by the slope of the timing variance versus the square of the timed interval, differed for tapping and drawing tasks. On the basis of those results, the authors posited that timing in tapping is explicit and as such uses a central representation of the interval to be timed, whereas timing in drawing tasks is implicit, that is, the temporal component is an emergent property of the trajectory produced. The authors examined that hypothesis in the present study by determining the linear relationship between timing variance and squared duration for tapping, circle-drawing, and line-drawing tasks. Participants (N = 501 performed 1 of 5 tasks: finger tapping, line drawing in the x dimension, line drawing in the y dimension, continuous circle drawing timed in the x dimension, or continuous circle drawing timed in the y dimension. The slopes differed significantly between finger tapping, line drawing, and circle drawing, suggesting separable sources of timing variability. The slopes of the 2 circle-drawing tasks did not differ from one another, nor did the slopes of the 2 line-drawing tasks differ significantly, suggesting a shared timing process within those tasks. Those results are evidence of a high degree of specificity in timing processes.     

A Formal Reconstruction of Buridan's Modal Syllogism

In this paper, we provide a historical exposition of John Buridan's theory of divided modal propositions. We then develop a semantic interpretation of Buridan's theory which pays particular attention to Buridan's ampliation of modal terms. We show that these semantics correctly capture his syllogistic reasoning.     

Filling the Gap on Developmental Change: Tests of a Dynamic Field Theory of Spatial Cognition

In early childhood, there is a developmental transition in spatial memory biases. Before the transition, children's memory responses are biased toward the midline of a space, while after the transition responses are biased away from midline. The Dynamic Field Theory (DFT) posits that changes in neural interaction and changes in how children perceive frames of reference underlie the transition. Here, we tested a prediction of the DFT that children younger than the transitional age would show the more advanced developmental pattern when tested with a perceptually salient midline axis. Four age groups (3 years, 6 months; 3 years, 8 months; 4 years; and 5 years) were tested at targets near midline. As predicted, children's responses were biased away from midline.     

Observed Attachment and Self-Report Affect Within Romantic Relationships

Adult attachment provides unique insights that help researchers and clinicians understand the complexities of individuals and relationships. In romantic relationships, individual attachment can explain partners' abilities for closeness and autonomy as well as how they experience affect within the relationship. These affective experiences during couple interactions have been shown to influence both proximal and distal relationship outcomes. Thus, the authors explore the impact of partners' observed attachment behaviors—coded using the AABQ—on continuous reports of their affective experiences during both difficult and positive marital conversations. Variables examining couple affective negativity and flexibility were developed using state space grids, and data were analyzed using GridWare. Results showed that observed female attachment behaviors significantly impacted a couple's affective experiences of negativity and flexibility during conversations, while there were no significant associations between male observed attachment behaviors and the couple affective experience. Clinical implications and suggestions for future research are discussed.     

The influence of environmental context in interpersonal observation–execution

Cyclical upper-limb movements involuntarily deviate from a primary movement direction when the actor concurrently observes incongruent biological motion. We examined whether environmental context influences such motor interference during interpersonal observation–execution. Participants executed continuous horizontal arm movements while observing congruent horizontal or incongruent curvilinear biological movements with or without the presence of an object positioned as an obstacle or distractor. When participants were observing a curvilinear movement, an object located within the movement space became an obstacle, and, thus, the curvilinear trajectory was essential to reach into horizontal space. When acting as a distractor, or with no object, the curvilinear trajectory was no longer essential. For observing horizontal movements, objects were located at the same relative locations as in the curvilinear movement condition. We found greater involuntary movement deviation when observing curvilinear than horizontal movements. Also, there was an influence of context only when observing horizontal movements, with greater deviation exhibited in the presence of a large obstacle. These findings suggest that the influence of environmental context is underpinned by the (mis-)matching of observed and executed actions as incongruent biological motion is primarily coded via bottom-up sensorimotor processes, whilst the congruent condition incorporates surrounding environmental features to modulate the bottom-up sensorimotor processes.     

Spontaneous gestures influence strategy choices in problem solving

Do gestures merely reflect problem-solving processes, or do they play a functional role in problem solving? We hypothesized that gestures highlight and structure perceptual-motor information, and thereby make such information more likely to be used in problem solving. Participants in two experiments solved problems requiring the prediction of gear movement, either with gesture allowed or with gesture prohibited. Such problems can be correctly solved using either a perceptual-motor strategy (simulation of gear movements) or an abstract strategy (the parity strategy). Participants in the gesture-allowed condition were more likely to use perceptual-motor strategies than were participants in the gesture-prohibited condition. Gesture promoted use of perceptual-motor strategies both for participants who talked aloud while solving the problems (Experiment 1) and for participants who solved the problems silently (Experiment 2). Thus, spontaneous gestures influence strategy choices in problem solving.     

Predicting children's word‐reading accuracy for common English words: The effect of word transparency and complexity

The effects of printed word frequency and transparency measures on single word reading accuracy were examined in 105 six‐year‐old children. The results indicated that it may be necessary to re‐appraise notions of orthography‐to‐phonology correspondences for children of this age. The influence of orthographic neighbourhood size appeared to derive from word frequency and graphemic complexity. The results also indicated that sonograph frequency was more predictive of reading accuracy than the GPC rules and weighted correspondences currently embodied in dual route and connectionist models of skilled reading.