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The control of reaching movements by young infants

Identification

Clé publique

doi:10.25911/5d78d7085a063

Auteurs

Mathew, Anne

Année déclarée

1990

Langue déclarée

und · en_AU

Type source

Thesis (PhD)

Première détection

2026-11-09T19:08:14.090415+00:00

Dernière observation des métadonnées

2026-11-09T19:08:14.090415+00:00

Dernière vérification HTTP

Non effectuée

Résumé documentaire — langue originale

Infant reaching movements have tortuous handpaths and multipeaked speed curves. It has been hypothesised that these movements comprise sequences of ballistic motor units whose boundaries are marked by troughs in the speed-time curve. Error correction, if any, is assumed to take place between and not within these movement units. This hypothesis was investigated in this study. Samples of reaches were obtained from groups of infants aged 4.5, 6 and 7.5 months as split-screen video recordings, which were then transcribed as sequences of (X,Y,Z) hand coordinates. There was an improvement in overall efficiency in reaching across the three age groups. Movement paths were examined for evidence of initial aiming and subsequent correction. At all ages, the initial direction of the movement was correlated with target direction, providing evidence that the hand was aimed towards the target. Additionally, changes in movement direction made after the commencement of the movement tended to curve the hand path towards the target, providing evidence of error Correction. Local minima of hand speed evident within segments of continuous movement were associated with tum towards the target. However, the movement path was also curved towards the target within the movement elements bounded by these minima. This finding was seen as being consistent with 'continuous' correction of movement errors and as contrary to the suggestion that infant movements are concatenations of ballistic movement units whose boundaries are marked by troughs in the speed profile.

Identifiants

DOI

10.25911/5d78d7085a063

HANDLE

1885/10259

OAI

oai:openresearch-repository.anu.edu.au:1885/10259

Repères documentaires

Famille documentaire

Thèse

Types déclarés par les sources

Thesis (PhD)

Les mentions d’entités ne constituent pas une preuve de reconnaissance juridique. La juridiction étudiée est distincte du pays d’affiliation des auteurs.

Sources

Repository · Document 1 · Document 2 · Document 3

• DOI · https://doi.org/10.25911/5d78d7085a063
• Handle · https://hdl.handle.net/1885/10259
• Document · https://openresearch-repository.anu.edu.au/bitstreams/8bff288f-7510-4381-aa34-2d49ac97ae6a/download

Statut documentaire

Pertinence à examiner

Bibliothèque

Cette identité n’est pas encore intégrée à la Bibliothèque juridique.