title: Systematic Influence of Perceived Grasp Shape on Speech Production.
abstract: Previous research has shown that precision and power grip performance is consistently influenced by simultaneous articulation. For example, power grip responses are performed relatively fast with the open-back vowel [a], whereas precision grip responses are performed relatively fast with the close-front vowel [i]. In the present study, the participants were presented with a picture of a hand shaped to the precision or power grip. They were required to pronounce speech sounds according to the front/above perspective of the hand. The results showed that not only the grip performance is affected by simultaneously pronouncing the speech sound but also the production of speech sound can be affected by viewing an image of a grip. The precision grip stimulus triggered relatively rapid production of the front-close vowel [i]. In contrast, the effect related to the power grip stimulus was mostly linked to the vertical dimension of the pronounced vowel since this stimulus triggered relatively rapid production of the back-open vowel [a] and back-mid-open vowel [o] while production of the back-close vowel [u] was not influenced by it. The fact that production of the dorsal consonant [k] or coronal consonant [t] were not influenced by these stimuli suggests that the effect was not associated with a relative front-back tongue shape of the articulation in the absence of changes in any vertical articulatory components. These findings provide evidence for an intimate interaction between certain articulatory gestures and grip types, suggesting that an overlapping visuomotor network operates for planning articulatory gestures and grasp actions.
authors.affiliation: Institute of Behavioural Sciences, Division of Cognitive and Neuropsychology, University of Helsinki, Helsinki, Finland.
authors.forename: Lari
authors.initials: L
authors.lastname: Vainio
authors.affiliation: Institute of Behavioural Sciences, Division of Cognitive and Neuropsychology, University of Helsinki, Helsinki, Finland.
authors.forename: Aleksi
authors.initials: A
authors.lastname: Rantala
authors.affiliation: Institute of Behavioural Sciences, Division of Cognitive and Neuropsychology, University of Helsinki, Helsinki, Finland.
authors.forename: Mikko
authors.initials: M
authors.lastname: Tiainen
authors.affiliation: Institute of Behavioural Sciences, Division of Cognitive and Neuropsychology, University of Helsinki, Helsinki, Finland.
authors.forename: Kaisa
authors.initials: K
authors.lastname: Tiippana
authors.affiliation: Institute of Behavioural Sciences, Division of Cognitive and Neuropsychology, University of Helsinki, Helsinki, Finland.
authors.forename: Naeem
authors.initials: N
authors.lastname: Komeilipoor
authors.affiliation: Institute of Behavioural Sciences, Division of Cognitive and Neuropsychology, University of Helsinki, Helsinki, Finland.|Institute of Behavioural Sciences, Phonetics and Speech Synthesis Research Group, University of Helsinki, Helsinki, Finland.
authors.forename: Martti
authors.initials: M
authors.lastname: Vainio
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D005260:Female; D005868:Gestures; D006225:Hand; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D010700:Phonetics; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D013060:Speech / Q000502:physiology*; D013062:Speech Articulation Tests; D013067:Speech Perception / Q000502:physiology; D013068:Speech Production Measurement; D055815:Young Adult