People are generally biased toward hearing and producing rhythms composed of simple integer ratios. However, the preference for specific rhythm structure is also significantly modulated by experience and differs across cultures (Jacoby and McDermott 2017). The role played by distinct musical experiences in developing the specific rhythmical categories remains unclear.
To address this issue we conducted a study on haptic rhythm reproduction on congenitally deaf people, that is, a population which has never have been exposed to auditory music. 20 congenitally deaf subjects (aged 18-40) participated in an experiment based on a haptic version of the iterating learning rhythm procedure(Jacoby and McDermott 2017) The rhythmical sequences were presented on the participants’ torso using a haptic strap, and subjects were asked to reproduce rhythmical sequences by tapping synchronously along with the stimuli. Each participant’s reproduction of a rhythm provided the seed for the next rhythm iteration, so that perceptual priors could be estimated.
Surprisingly, we found that the deaf individuals have rhythmic categories that are similar to those revealed in previous studies on auditory rhythm in the general population. Like hearing populations, deaf subjects exhibit a tendency toward integer ratio rhythms. Comparing to hearing US subjects, they also tended to have significantly more of the simple categories (such as 1:1:1 ratio), and significantly less complex rhythms categories (i.e.1:2:3 ratio).
Our results show that perceptual priors for specific rhythms can be developed independently of auditory and musical exposure.

Rhythm categories without auditory experience? Perceptual priors reveal by haptic rhythm reproduction in the congenitally deaf subjects.

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PS: Aesthetic arts, cognition, and cultural transmission

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### Welcome to the fourth Cultural Evolution Society Conference, CES2022! 

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Cultural Evolution Society 2022

The field of cultural evolution is growing in size and scope; its theories, methods and applications - both academic and applied - are getting ever more robust. Do join us in what promises to be an exciting exchange of ideas and a celebration of our field.

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Rhythm categories without auditory experience? Perceptual priors reveal by haptic rhythm reproduction in the congenitally deaf subjects.

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