Language rhythms in baby hand movements.
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Deafness↗
Biomedical subjects
D Ostry
Publications and source records attributed to D Ostry.
Specific involvement of human parietal systems and the amygdala in the perception of biological motion.
To explore the extent to which functional systems within the human posterior parietal cortex and the superior temporal sulcus are involved in the perception of action, we measured cerebral metabolic activity in human subjects by positron emission tomography during the perception of simulations of biological motion with point-light displays. The experimental design involved comparisons of activity during the perception of goal-directed hand action, whole body motion, object motion, and random motion. The results demonstrated that the perception of scripts of goal-directed hand action implicates the cortex in the intraparietal sulcus and the caudal part of the superior temporal sulcus, both in the left hemisphere. By contrast, the rostrocaudal part of the right superior temporal sulcus and adjacent temporal cortex, and limbic structures such as the amygdala, are involved in the perception of signs conveyed by expressive body movements.
Adult↗
A sonographic technique to reduce beam distortion by curved interfaces.
Ultrasonic beams are distorted during propagation between two media with different velocities if the traversed interface is curved within the ultrasonic beamwidth. The distorting effects of various interfaces on a beam generated by a multi-element transducer are analyzed and a technique to reduce these by controlling the time delays to the individual elements is presented.
Equipment Design↗
Attention, practice, and semantic targets.
Observers detected letters in streams of digits under conditions of divided or selective attention for a period of 10 hr. There were marked practice effects both on the detectability of targets and on the response criteria used by observers. The detectability of targets and the response criteria were both strongly dependent on events in the contralateral channel. The same effects were observed in a second experiment in which the task was to detect animal names in streams of nouns. The data are similar to those obtained in recent experiments using pure tones, so that a unified theory of attention should be possible, valid alike for semantic and nonsemantic messages. Such a theory is outline.
Attention↗