Mapping between sound, brain and behaviour: four-level framework for understanding rhythm processing in humans and non-human primates.

Lenc, Tomas;Merchant, Hugo;Keller, Peter E;Honing, Henkjan;Nozaradan, Sylvie;et.al.
(2021) Philosophical transactions of the Royal Society of London. Series B, Biological Sciences — Vol. 376, n° 1835, p. 20200325 (2021)

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Abstract
Humans perceive and spontaneously move to one or several levels of periodic pulses (a meter, for short) when listening to musical rhythm, even when the sensory input does not provide prominent periodic cues to their temporal location. Here, we review a multi-levelled framework to understanding how external rhythmic inputs are mapped onto internally represented metric pulses. This mapping is studied using an approach to quantify and directly compare representations of metric pulses in signals corresponding to sensory inputs, neural activity and behaviour (typically body movement). Based on this approach, recent empirical evidence can be drawn together into a conceptual framework that unpacks the phenomenon of meter into four levels. Each level highlights specific functional processes that critically enable and shape the mapping from sensory input to internal meter. We discuss the nature, constraints and neural substrates of these processes, starting with fundamental mechanisms investigated in macaque monkeys that enable basic forms of mapping between simple rhythmic stimuli and internally represented metric pulse. We propose that human evolution has gradually built a robust and flexible system upon these fundamental processes, allowing more complex levels of mapping to emerge in musical behaviours. This approach opens promising avenues to understand the many facets of rhythmic behaviours across individuals and species. This article is part of the theme issue 'Synchrony and rhythm interaction: from the brain to behavioural ecology'.
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Lenc, T., Merchant, H., Keller, P. E., Honing, H., Varlet, M., & Nozaradan, S. (2021). Mapping between sound, brain and behaviour: four-level framework for understanding rhythm processing in humans and non-human primates. Philosophical transactions of the Royal Society of London. Series B, Biological Sciences, 376(1835), 20200325. https://doi.org/10.1098/rstb.2020.0325 (Original work published 2021)