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Biomedical subjects

P Bertelson

Publications and source records attributed to P Bertelson.

At least 37 records · Page 2Linked to original sources
PubMed1983

A Ponzo-like illusion left and right of fixation: a failed prediction.

Ponzo-like figures, with two parallel horizontal test lines superimposed on a pattern of converging background lines suggesting either a floor or a ceiling were presented in a tachistoscope unpredictably left or right of fixation, and the subjects had to compare the test lines as to length. The classical relative overestimation of the line closest to the apex of the background lines was obtained, but it was not stronger in the left visual field, as seemed to be predicted by at least two current generalizations concerning right hemisphere capacities: (a) that the right hemisphere is better at extracting spatial relations; (b) that its processing mode is more "holistic" and less "analytic" than that of the left hemisphere.

Distance Perception↗
PubMed1977

Spatial effects in speech perception in the absence of spatial competition.

Two synthetic speech syllables, differing in pitch, were presented over one loudspeaker situated at one of the following azimuths: 0 degrees (in from of the subject); 45 degrees, 90 degrees, and 135 degrees to the left or to the right; and 180 degrees. The subject's task was to report the high-pitch syllable. The pattern of performance can be described in terms of two component effects: a decreasing anterior-posterior gradient, and right-side advantage. Competition between messages from one direction only appears to be as effective in determining auditory spatial effects as competition between spatially distinct sources.

Adolescent↗
PubMed1976

Spatial constraints on focused attention: beyond the right-side advantage.

The subjects listened to one of two simulataneous synthetic speech syllables delivered independently over two loudspeakers. When the loudspeakers were situated at 90 degrees to the left and to the right, right-side advantage was found. When one loudspeaker was situated in front of the subject in the median plane, and the other at one of several azimuthal positions around him an advantage of the frontal position was observed in all cases. On the other hand, performance on the nonfrontal message was affected significantly by its position. The pattern of performance which is presumably to cerebral dominance, an advantage of sources situated in front of the subject over those at his back, and possibly an advantage of sources near the median plane over more remote ones.

Adolescent↗
PubMed1975

Spatial position versus ear of entry as determinant of the auditory laterality effects: a stereophonic test.

The study concerned discriminating between ear of entry and apparent spatial position as possible determinants of lateral asymmetries in the recall of simultaneous speech messages. Apparent localization to the left or right of the median plane was created either through a time difference (.7 msec), through intensity differences between presentations of the same verbal message at the two ears, or through dichotic presentations. Right-side advantage was observed with the three types of presentation (Experiments 1, 2, and 3). The finding of right-side advantage with stereophony based on a time difference only, in the absence of intensity difference, cannot be accounted for in terms of an ear advantage and shows that apparent spatial separation of the sources can by itself produce a laterality effect. Differences in the degree of lateral asymmetry between the various conditions were also observed. The findings of Experiments 4 and 5 suggest that these differences are better explained in terms of different impressions of localization of the sound sources than in terms of relative intensity at the "privileged" ear.

Adolescent↗