Effects of phase changes in low-numbered harmonics on the internal representation of complex sounds

A series of experiments investigated the effect of phase changes in lownumbered single harmonics in target sounds that were either synthesized steady-state vowels or periodic signals having only a single formant. A matching procedure was used in which subjects selected a sound along a continuum differing in first formant frequency in order to get the best match with the target sound; perceptual effects of the phase manipulations in the target were detected as a change in the matched first formant frequency. Stimuli had to contain at least three harmonics to produce the effect, but it did not require a particular starting phase of the components. A suppression phenomenon is discussed, in which phase changes alter the phase-locking characteristics of auditory fibres tuned to low-numbered harmonics.     

Book reviews

Bloom, A. H. The Linguistic Shaping of Thought : A Study of the Impact of Language on Thinking in China and the West. Hillsdale, N.J.: Erlbaum. 1981. Pp. 106. £9.95. ISBN 0 89859 089 2.

Fodor, J. A. Representations : Philosophical Essays in the Foundations of Cognitive Science. Brghton: Harvester. 1981. Pp. 343. £22.50. ISBN 0 85527 977 X.

Sanford, A. J. and Garrod, S. C. Understanding Written Language: Explorations in Comprehension Beyond the Sentence. Chichester: John Wiley & Sons. 1981. Pp. xiv + 224. £ 11.30. ISBN 0 471 27842 4.

Springer, S. P. and Deutsch, G. Left Brain, Right Brain. San Francisco: W. H. Freeman & Co. 1981. Pp. 243. £4.95 (paperback). ISBN 0 7167 1270 9.

Crystal, D. Introduction to Language Pathology. London : Edward Arnold. 1980. Pp. 214. ISBN 0 7131 62759. £5.50.

Hulme, C. Reading Retardation and Multi-Sensory Teaching. London : Routledge & Kegan Paul. 1981. £12.50. Pp. 200. ISBN 0 7100 0761 2.

Liben, I,. S., Patterson, A. R. and Newcombe, N. (Eds). Spatial Representation and Behaviour Across the Life Span. New York: Academic Press. 1981. Pp. 404. ISBN 0 12 447980 4. £17.80.

Coltman, D. Jean Piaget: Experiments in Contradiction. Chicago: University of Chicago Press. 1980. Pp. 310. ISBN 0 226 66779 0. £13.20.

Hofer, M. A. The Roots of Human Behavior. San Francisco: Freeman. 1981. Pp. xiii + 331. Paperback £6.70. ISBN 0 7167 1278 4.     

Perceptual grouping of speech components differing in fundamental frequency and onset-time

Are there general auditory grouping principles that allow the sounds of a single speaker to be grouped together before phonetic categorisation? Four experiments are reported on the use made of a common fundamental frequency or a common starting time in grouping formants together to form phonetic categories. The first experiment shows that the perception of a vowel category is unaffected by formants being excited at different fundamentals or starting at 100-ms intervals. The second and third experiments show no effect of a different fundamental on the combination of the timbres of pairs of formants presented either binaurally or dichotically to form diphthongs. Onset-time also has no effect with binaural presentation. The fourth experiment finds both an effect of grouping formants by a common fundaental using formant trajectories that do not overlap in frequency, and also an effect of onset-time. Neither a common fundamental nor common onset-time is either a necessary or a sufficient condition for formants to be grouped into a common speech category, although they can be shown to exert an influence. Both these variables exert a considerable influence on the number of sounds that subjects report hearing, even under conditions where they do not influence the reported speech category, indicating a dissociation between mechanisms concerned with “how many” sound sources there are, and those concerned with “what” a source consists of.     

Book reviews

Hearing Haggerd, M. P. & Evans, E. F. (Eds.). 1987. British Medical Bulletin, 43 (4), 775-1037. ISBN 0-443-02899-6. £22.50.

Perlmutter, M. (Ed.) (1986). Perspectives on intellectual development : The Minnesota Symposium on Child Psychology. Vol. 19. Hillsdale,NJ: Lawrence Erlbaum Associates, Inc. Pp. 261. ISBN 0-89859-784-6. £19.95.

Ellis, H. D., Jeeves, M. A., Newcombe, F., & Young, A. (Eds.) (1986). Aspects of face processing. Bordrecht : Martinus Nijhoff. Pp. 509. ISBN 90-247-3357-X. £80.25.

Gabrielsson, A. (Ed.) (1987). Action and perception in shythm and music. Stockholm: Royal Swedish Academy of Music. Pp. 237. ISBN 91-85428-51-5.

Dowling, John E. (1987). The Retina. Cambridge, MA, and London :Belknap Press. Pp. xiv + 282. ISBN 0-674-76680-6. $29.95.

Foorman, B. R. & Siegel, A. W. (1986). Acquisition of reading skills : Cultural constraints and cognitive universals. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc. Pp. 168. ISBN 0-89859-642-4. £15.00.

Stillings, N., Feinstein, M., Garfield, J., Rissland, E., Rosenbaum, D., Weisler, S., & Baker-Ward, L. (1987). Cognitive science : An introduction. Cambridge, MA: MIT Press. Pp. 533. ISBN 0-262-19257-8. £22.50.

Kapur, N. (1988). Memory disorders in clinical practice. London:Butterworths. Pp. 289. ISBN 0-407-00712-1. £39.50.

Bussis, A. M., Chittenden, E. A. Amarel, M. & Klausner, E. (1985). Inquiry into meaning: An invetigation of learning to read. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc. Pp. 367. ISBN 0-89859-504-5. £32.95.