A general rule for sensory cue summation:evidence from photographic, musical, phonetic and cross-modal stimuli

To, M. P. S. and Baddeley, R. J. and Troscianko, T. and Tolhurst, D. J. (2011) A general rule for sensory cue summation:evidence from photographic, musical, phonetic and cross-modal stimuli. Proceedings of the Royal Society B: Biological Sciences, 278 (1710). pp. 1365-1372. ISSN 0962-8452

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Abstract

The Euclidean and MAX metrics have been widely used to model cue summation psychophysically and computationally. Both rules happen to be special cases of a more general Minkowski summation rule (Cue(1)(m) + Cue(2)(m))(1/m), where m = 2 and infinity, respectively. In vision research, Minkowski summation with power m = 3-4 has been shown to be a superior model of how subthreshold components sum to give an overall detection threshold. Recently, we have previously reported that Minkowski summation with power m = 2.84 accurately models summation of suprathreshold visual cues in photographs. In four suprathreshold discrimination experiments, we confirm the previous findings with new visual stimuli and extend the applicability of this rule to cue combination in auditory stimuli (musical sequences and phonetic utterances, where m = 2.95 and 2.54, respectively) and cross-modal stimuli (m = 2.56). In all cases, Minkowski summation with power m = 2.5-3 outperforms the Euclidean and MAX operator models. We propose that this reflects the summation of neuronal responses that are not entirely independent but which show some correlation in their magnitudes. Our findings are consistent with electrophysiological research that demonstrates signal correlations (r = 0.1-0.2) between sensory neurons when these are presented with natural stimuli.

Item Type:
Journal Article
Journal or Publication Title:
Proceedings of the Royal Society B: Biological Sciences
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2700
Subjects:
ID Code:
65480
Deposited By:
Deposited On:
09 Jul 2013 08:18
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Jun 2020 02:14