Abstract
ObjectivesThe analysis of categorization of everyday sounds is a crucial aspect of the perception of our surrounding world. However, it constitutes a poorly explored domain in developmental studies. The aim of our study was to understand the nature and the logic of the construction of auditory cognitive categories for natural sounds during development. We have developed an original approach based on a free sorting task (FST). Indeed, categorization is fundamental for structuring the world and cognitive skills related to, without having any need of the use of language. Our project explored the ability of children to structure their acoustic world, and to investigate how such structuration matures during normal development. We hypothesized that age affects the listening strategy and the category decision, as well as the number and the content of individual categories.DesignEighty-two French children (6–9 years), 20 teenagers (12–13 years), and 24 young adults participated in the study. Perception and categorization of everyday sounds was assessed based on a FST composed of 18 different sounds belonging to three a priori categories: non-linguistic human vocalizations, environmental sounds, and musical instruments.ResultsChildren listened to the sounds more times than older participants, built significantly more classes than adults, and used a different strategy of classification. We can thus conclude that there is an age effect on how the participants accomplished the task. Analysis of the auditory categorization performed by 6-year-old children showed that this age constitutes a pivotal stage, in agreement with the progressive change from a non-logical reasoning based mainly on perceptive representations to the logical reasoning used by older children. In conclusion, our results suggest that the processing of auditory object categorization develops through different stages, while the intrinsic basis of the classification of sounds is already present in childhood.
Highlights
One of the most crucial aspects of childhood development is the ability to acquire language and communication [1,2]
Due in part to early ontogenesis, most auditory functions are functional at birth, but some aspects of auditory processing mature relatively early during development, while other features of acoustic processing require a longer experience of hearing sounds
We examined the different classification strategies used at different development stages from 6 years to adulthood to infer the development of the cognitive organization of everyday sounds
Summary
One of the most crucial aspects of childhood development is the ability to acquire language and communication [1,2]. A large body of studies has focused on spoken language and has shown the existence of different stages of speech comprehension during development, ranging from phonemic discrimination to more complex processing, including lexical or syntactic knowledge [3,4,5,6,7,8]. Due in part to early ontogenesis, most auditory functions are functional at birth, but some aspects of auditory processing mature relatively early during development, while other features of acoustic processing (e.g., sound localization, hearing in the presence of background noise, and attention) require a longer experience of hearing sounds. Complex auditory processing, such as music perception development, has been widely studied [11,12,13,14], to our knowledge no study has evaluated how the perception of environmental sounds matures during normal development
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