Abstract
In two experiments, we examined the extent to which audiovisual temporal order judgments (TOJs) were affected by spatial factors and by the dimension along which TOJs were made. Pairs of auditory and visual stimuli were presented from either the left and/or right of fixation at varying stimulus onset asynchronies (SOAs), and participants made unspeeded TOJs regarding either "Which modality was presented first?" (experiment 1), or "Which side was presented first?" (experiment 2). Modality TOJs were more accurate (i.e. just-noticeable differences, JNDs, were smaller) when the auditory and visual stimuli were presented from different spatial positions rather than from the same position, highlighting an important potential confound inherent in previous research. By contrast, spatial TOJs were unaffected by whether or not the two stimuli were presented in different modalities. A between-experiments comparison revealed more accurate performance (i.e. smaller JNDs) when people reported which modality came first than when they reported which side came first for identical bimodal stimulus pairs. These results demonstrate that multisensory TOJs are critically dependent on both the relative spatial position from which stimuli are presented and on the particular dimension being judged.
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Notes
In the Introduction to their paper, Hirsh and Sherrick (1961) point out that performance on simultaneous/successive judgment tasks will be affected by the dimension along which stimuli vary, despite the fact that they do not consider this point for the TOJ studies they report. However, this apparent inconsistency may simply reflect another of Hirsh and Sherrick's underlying assumptions, namely, that TOJs and simultaneous/successive judgment tasks rely on very different neural mechanisms.
The +200 ms points were excluded from this computation, because most participants performed nearly perfectly at this interval, so no additional variance was accounted for by these points. The inclusion of these points would actually have resulted in an artefactual reduction in slope.
This hemispheric redundancy account can be considered as a specific example of a more general "spatial channel" account (see Regan 1982 for a review). That is, stimuli presented from the same spatial location may activate a common limited capacity spatial channel, whereas stimuli presented to different spatial positions may activate different spatial channels. However, we prefer the hemispheric redundancy account over the spatial channel account given the problems that are associated with the appropriate definition of a channel (see Regan 1982; Spence et al. 2001b).
Because light travels through air far more rapidly than sound, these differences in transduction latencies can be offset, or even reversed, for pairs of audiovisual stimuli that occur very far from us (see Pöppel et al. 1990). For example, we often see distant lightening before hearing the associated thunder (Spence and Squire 2003). However, such differences are unlikely to have had any significant effect in the present studies since the auditory and visual stimuli were presented relatively close to the participants (distance=62 cm; see also Sugita and Suzuki 2003).
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Acknowledgements
Charles Spence and David I. Shore were funded by a Network Grant from the McDonnell-Pew Centre for Cognitive Neuroscience, University of Oxford. David I. Shore was also funded by an operating grant from the Natural Science and Engineering Research Council of Canada.
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Zampini, M., Shore, D.I. & Spence, C. Audiovisual temporal order judgments. Exp Brain Res 152, 198–210 (2003). https://doi.org/10.1007/s00221-003-1536-z
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DOI: https://doi.org/10.1007/s00221-003-1536-z