Abstract
Conducting a large orchestra is an impressive feat that simultaneously requires the intake of the whole musical gestalt and the analytical decomposition of the orchestral sound into its components1. How, for example, does a conductor identify a specific musician within a multiplayer section? Here we provide evidence from brain-potential recordings that experienced professional conductors develop enhanced auditory localization mechanisms in peripheral space.
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Seven classical-music conductors (mean age, 45 yr; mean conducting experience, 19 yr; minimum, 6 yr), seven pianists (mean age, 43 yr; mean professional playing experience, 16 yr; minimum, 7 yr) and seven non-musicians (mean age, 43 yr) were tested in a paradigm used originally to demonstrate superior sound localization in congenitally blind subjects2 (Fig. 1a). Specifically, the subjects listened to brief pink-noise bursts delivered by central and peripheral arrays of three loudspeakers each (C1–3 and P1–3 in Fig. 1a); these speakers were arranged along a semicircle extending from the midline to 90 degrees right of centre.
While frequent stimuli (84%; frequency of 500–5,000 Hz, 75 decibels, and 80 ms duration) and infrequent 'deviant' stimuli of increased bandwidth (16%; 500–15,000 Hz) were delivered in random order from all speakers (interstimulus interval, 90–270 ms), the subject's task was selectively to attend –– in different runs — to the centremost (C1) or rightmost speaker (P1) and to press a button to indicate the 'deviant' stimuli occurring at the designated location (called targets). We recorded multichannel event-related brain potentials (ERPs) using standard methodology2 and these showed a typically enhanced negativity (termed 'Nd attention' effect) for the relevant speakers (Fig. 1a). In the conductors, ERPs invoked in response to stimuli from adjacent locations showed a similar attention effect of smaller amplitude, indicating that auditory spatial attention is distributed in a gradient fashion3 for both central and peripheral auditory space.
Attentional effects are also revealed by computing the difference between ERPs to attended-direction and unattended-direction stimuli (Fig. 1b, c). Although a spatial gradient was evident in all three groups for central auditory space, only the conductors displayed a gradient for the periphery. This improved spatial tuning in conductors also has behavioural consequences, as attested by a significantly reduced false-alarm rate for adjacent locations (P2, P3) in the periphery.
The very similar scalp topography of the attention effect (Fig. 1d) for the different groups indicates that conductors probably do not engage different neural populations to perform the task. From magnetoencephalographic recordings4, the attention effect is known to arise in the secondary auditory cortex, an area also implicated from functional imaging5. Improved learning-induced use of spectral cues generated by the head and outer ears, and analysed by the auditory cortex6, might underlie the localization advantage experienced by conductors. Although conductors probably employ other mechanisms such as perceptual grouping7,8 to identify single musicians, our findings provide another example of how extensive training can shape cognitive processes and their neural underpinnings.
References
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Münte, T., Kohlmetz, C., Nager, W. et al. Superior auditory spatial tuning in conductors. Nature 409, 580 (2001). https://doi.org/10.1038/35054668
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DOI: https://doi.org/10.1038/35054668
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