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Erschienen in: Experimental Brain Research 2/2005

01.05.2005 | Research Article

The influence of metricality and modality on synchronization with a beat

verfasst von: Aniruddh D. Patel, John R. Iversen, Yanqing Chen, Bruno H. Repp

Erschienen in: Experimental Brain Research | Ausgabe 2/2005

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Abstract

The great majority of the world’s music is metrical, i.e., has periodic structure at multiple time scales. Does the metrical structure of a non-isochronous rhythm improve synchronization with a beat compared to synchronization with an isochronous sequence at the beat period? Beat synchronization is usually associated with auditory stimuli, but are people able to extract a beat from rhythmic visual sequences with metrical structure? We addressed these questions by presenting listeners with rhythmic patterns which were either isochronous or non-isochronous in either the auditory or visual modality, and by asking them to tap to the beat, which was prescribed to occur at 800-ms intervals. For auditory patterns, we found that a strongly metrical structure did not improve overall accuracy of synchronization compared with isochronous patterns of the same beat period, though it did influence the higher-level patterning of taps. Synchronization was impaired in weakly metrical patterns in which some beats were silent. For the visual patterns, we found that participants were generally unable to synchronize to metrical non-isochronous rhythms, or to rapid isochronous rhythms. This suggests that beat perception and synchronization have a special affinity with the auditory system.
Fußnoten
1
Importantly, the human uniqueness of BPS is not due to a lack of accurate timekeeping mechanisms in other animals. For example, studies of rabbits (e.g., Moore et al. 1998) show that other mammals are capable of interval timing. Given this fact, it is curious that despite many decades of research in psychology and neuroscience in which animals have been trained to do complex motor tasks, there is to our knowledge not a single published case in which a non-human animal species has been successfully trained to tap or peck in synchrony with an auditory metronome.
 
2
We are grateful to Edward Large for confirming these predictions with the coupled-oscillator model of Large and Jones (1999) and with a newer version of this model, using our stimuli as input.
 
3
Throughout this paper, the term “synchronization accuracy” refers to the variability of tapping as measured by the variability of tap-to-tone asynchronies or of inter-tap-intervals (ITIs), and not to absolute asynchronies or mean ITIs.
 
4
The actual inter-beat interval was 781 ms because the software used for sequence generation (MAX 3.0 running on a Macintosh Quadra 660AV computer) produced output that was 2.4% faster than specified. Throughout the paper, we report the specified or recorded temporal values. Actual values can be obtained, if necessary, by multiplying by .976.
 
5
Accents perceived due to grouping rather than due to physical differences between events such as intensity differences.
 
6
We did not have the equipment necessary to determine the precise luminance and duration of the flashes. However, we determined informally that a flicker sensation persisted up to rates of about 30 Hz, i.e., a 33-ms IOI.
 
7
It should be noted that Povel and Essens (1985), who provided the patterns we used in our study, were interested in a model of rhythm perception based on different coding strategies for metrical and non-metrical sequences, and were not working in an entrainment / attentional-oscillator based framework. Nevertheless, their sequences are useful for exploring predictions of this framework.
 
8
It is likely that the recurring long interval also aided synchronization with auditory sequences, especially WM sequences. The difference between auditory SM and WM sequences might have been even more striking if that long interval had not been present. We are currently investigating this issue.
 
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Metadaten
Titel
The influence of metricality and modality on synchronization with a beat
verfasst von
Aniruddh D. Patel
John R. Iversen
Yanqing Chen
Bruno H. Repp
Publikationsdatum
01.05.2005
Verlag
Springer-Verlag
Erschienen in
Experimental Brain Research / Ausgabe 2/2005
Print ISSN: 0014-4819
Elektronische ISSN: 1432-1106
DOI
https://doi.org/10.1007/s00221-004-2159-8

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