Auditory continuity and amplitude edges.

摘要: The present experiments investigated the illusion of a soft tone sounding continuous when it was actually alternating with burst louder noise. It found that brief changes in amplitude tones, introduced before and after noise burst, reduced continuity; this reduction greater decreased rather than increased results suggest lack 'edge information' is implicated continuity. Perceived auditory continuity has recently been by number researchers. This an which interrupted, softer sound, such as tone, perceived fills missing spaces. approach taken most researchers to try explain effect relatively simple persistence neural activity related assumed be result some facilitation activation associated interrupting sound (Thurlow & Elfher, 1959; 1971; Elfner Caskey, 1965; Houtgast, 1972; vanNoorden, 1975). Indeed, cases where response would likely interact i.e., masking occur, better. Warren, Obusek, Ackroff (1972); however, not interpreted them effect, but suggesting way system compensates for situation really have masked one had latter continuous. due operation same process operating merely mimic true situation. Accepting conclusions Warren et al. does entail rejecting 'neural persistence' hypothesis mentioned earlier. Perhaps mechanism masking. One led, question assumption findings. first if phoneme sentence replaced perceptually restored (Warren Sherman, 1974). Neural inadequate explanation. Of course, may different mechanisms are involved phonemic restoration pure tones. An illusory has, demonstrated tones insufficient effect. If repeatedly continuously gliding up down pitch, parts glide pattern deleted bursts, at least good steady pitch (Dannenbring, 1976). portion glide, rising part, falling or part direction changing, always restored. suggests *This research supported grants from National Research Council Canada, FCAC program Quebec Ministry Education, McGill University Graduate Faculty, awarded author. Reprints obtained author, Psychology Department, University, 1205 McGregor Ave., Montreal, Quebec, H3A 1B1 tNow St Francis Xavier Antigonish, Nova Scotia. Canad. J. Psychol./Rev. Psychol., 1977, 31 (3) 151 model must capable interpolation. In trying analyse perceptual phenomenon, important consider pattern-recognition aspects illusions produces correct description natural-world led impoverished stimulus create incorrect description. Illusions important, therefore, determining information used mechanisms. We considerations reason follows. real world, input our ears structured many co-occurring sources, often momentarily obliterating evidence another's existence. recover various individual sources. To understand we ask what can decomposition input. Speculations premature until clear picture used. source concerning whether continuing behind obvious processes corresponding frequency components continue through sound. referred perseveration' hypothesis. But only evidence; another happens two signals edges they meet. know that, vision, edge critical. Two surfaces differ brightness meet, change smoothly equal brightnesses away edge, will seen brightness, each surface being homogeneous (Cornsweet, 1970, p. 273). reasonable postulate temporal audition, example meets importance, also regions. A B, meet usually assigned region, A, shape specifying B. When happens, B region overlapped A. analogous case sounds, meeting 'edge,' probably property (for ecologically valid reasons), boundary heard overlapping continues particularly again offset There simply no independent 'edge' left over indicate it, too, bounded junction Suppose did provide onset so turning off. Then should less Thus quickly turned loudness 10 dB just loud repeating cycle, resultant gradients, belonging alone, might serve off during predict apparent compared remained constant intensity burst. set alternative prediction simpler According explanation, sets into activity. comes on, activates circuitry tone. Therefore circuit persists its hear theory prior 152 A.S. Bregman G.L. Dannenbring certainly worse upon lowering overall making immediately On other hand boost increase