The purpose of this investigation was to examine the illusion of auditory apparent motion (AM), and compare it to the visual AM function. Visual explanations of this phenomenon rely on a two-process theory, with the spatial separation between the two stimuli determining which process is involved. A pilot experiment examined the role of spatial separation on auditory AM. Subjects were required to listen to a pair of 50 msec. uncorrelated white noise sources, led through two speakers, and separated in time by interstimulus onset intervals (ISOI's) ranging from 0 to 500 msec. The speakers were positioned at one of eleven different locations which varied both in their separation (0-160° azimuth) and distance from the listener (17-34 inches). The subjects classified their experience of the stimulus presentation into one of five response categories. In addition, they were required to report the direction (left or right) of the first-occurring stimulus. Neither the angular separation between the sound sources nor the distance of the sources from the subject had any effect on the range or midpoint of the ISOI's which produce the illusion of motion. In addition, the percentage of correct direction judgements were not affected by the location of the sound sources. The main experiment examined the possibility of perceiving auditory AM in the absence of binaural cues. Six listeners were employed in this experiment, and only three separation (10, 40 and 160°). Each subject was tested at all speaker positions, both with one ear occluded and with both ears open. The results of this experiment indicated that AM can be perceived under monaural listening conditions. Spatial separation did effect the illusion in this condition. As the separation between the sound sources increased, the percentage of motion reports decreased. The detection of direction of the motion was more difficult as the separation decreased in the monaural condition. These results conflict with previous explanations of motion perception in the auditory modality, which rely exclusively on the presence of binaural spatial information. A two process theory of AM is also indicated, but the spatial separation does not determine which mechanism is being employed.

Thesis (Ph. D.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.

Thesis (Ph. D.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.

Doktorsavhandling--Historia--Uppsala Universitet, 1998. / Bibliogr. p. 248-260.

Reproduction de : Thèse de doctorat : Psychologie : Lyon 2 : 2002. / Titre provenant de l'écran-titre. Bibliogr. Index.

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No description available.

The primary purpose of the present study was to examine various aspects of local and global perception in groups of children and young adults with average ages of 6, 8, 10, 12, and 22 years. The aspects examined included developmental differences in RT for local and global visual information, the influence of filtering on global and local perception, and role of distracter congruency and compatibility on processing local and global stimuli. At a general level, the findings revealed that participants processed global faster than local stimuli. With the presence of distracters, 6 and 8-year-old participants demonstrated slower RTs for global targets relative to local targets. Distracter congruency or compatibility did not differentially affect global and local processing. However, congruency did appear to be related to differential performance for 6-year old males versus females. These results indicate that the underlying processes involved in global and local perception may be separate, with global perception relying on attentional mechanisms to a greater extent than local perception.

No description available.

No description available.