Verbal-manual time sharing in children as a function of task priority

Eighty-three normal, right-handed children performed (a) unimanual finger tapping, (b) recitation of a tongue twister, and (c) both tasks concurrently. Tradeoffs in dual-task performance were measured as the priority assigned to each task was manipulated. Irrespective of task priority, speaking interfered to a greater degree with right-hand tapping than with left-hand tapping, but the effect of tapping upon verbal production and speech errors was not lateralized. The asymmetric effect of speech upon tapping, which was seen in 85.5% of the children, cannot be attributed to the disparity between hands in baseline tapping rate. The findings suggest that time-sharing asymmetry reflects cerebral lateralization of speech, but only some of the results would be predicted on the basis of a functional distance principle of cerebral organization.     

Music draws attention to the left and speech draws attention to the right

Providing free-field music input prompts right-handers to attend to their left side in a loudness-matching task that requires no musical analysis. Conversely, speech prompts rightward attention. The processes inferred are akin to the attentional asymmetry demonstrated in the syndrome of hemispatial neglect.     

Central vision in the newborn

Newborns' fixations on a 4° dot were longer than their fixations on the comparable part of a blank field. This suggests newborns can detect a stimulus with the fovea or with some part of the retina near the fovea.     

INTRODUCTION: TOWARD A METAPHYSIC OF MEANING

We introduce a two‐part collection of articles (Part 2 to appear in the September 2010 issue) exploring a possible new research program in the field of science and religion. At the center of the program lies an attempt to develop a new theology of nature drawing on the philosophy of C. S. Peirce. Our overall idea is that the fundamental structure of the world is exactly that required for the emergence of meaning and truth‐bearing representation. We understand the emergence of a capacity to interpret an environment to be important to the emergence of life, and we see the subsequent history of biological evolution as a story of increasing capacities for meaning making and meaning seeking. Theologically, we understand God to be the ground of all such meaning making and the ultimate goal of the universe's emerging capacity for interpreting signs. Here we explain our reasons for seeking a new metaphysical framework in which science and theology may each find a home. We survey the contributions to the two‐part collection, and we suggest that the interdisciplinary collaboration from which these have arisen may serve as a methodological model for the field of science and religion.     

One version of direct response priming requires automatization of the relevant associations but not awareness of the prime

Priming is the influence of one event on performance during a second event. One type of priming is known as semantic priming because it biases interpretation of the subsequent stimulus. Another type, direct response priming, biases responding directly without semantic mediation. Research reviewed in this article indicates that two versions of the second type, direct response priming, can be distinguished. One version, explicit priming, requires awareness of the prime. The other version, associative response priming, occurs even if the prime is masked and not phenomenally visible. This version, which is attributed to associations relating specific sensory events to movements of particular muscles, is enabled only if the association has previously been automatized by brief practice in which the to-be-primed response is made to the stimulus that subsequently appears as the prime. Associative response priming can be explained by a simple stimulus–response interpretation; other varieties of priming are more theoretically challenging.