The dynamic nature of early coordination: Evidence from bilateral leg movements in young infants.

Thelen, Esther; Skala, Karl D.; Kelso, J. Scott

doi:10.1037/0012-1649.23.2.179

Cited by 104 publications

(62 citation statements)

References 54 publications

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“…The PV corresponds to the changeover from the acceleration to the deceleration phase. 34,35 The more corrections of trajectory there are during movement performance, the longer the deceleration phase and the more MUs.…”

Section: Movement Kinematicsmentioning

confidence: 99%

Effects of Task Goal and Personal Preference on Seated Reaching Kinematics After Stroke

Wong

Lin

et al. 2001

Stroke

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Background and Purpose-Current theories of motor control in rehabilitation focus on how the nervous system responds to many types of external and internal constraints to execute motor behavior to accomplish a task. However, the dynamic interplay between these 2 constraints remains unclear. This study examined the impact of some aspects of internal and external constraints on motor performance in persons with stroke. Methods-Twenty-seven persons with stroke used the uninvolved arms to perform an upper-extremity reaching task under 4 experimental conditions, formed by the crossing of functional goals and personal preferences. For the higher level of a functional goal, subjects took a drink from a can of beverage. For the lower level of a functional goal, subjects brought the can to the mouth without drinking. The level of personal preferences was determined, by interview, by the degree of predilection for particular beverages. Results-Significant and large effects of functional goals and personal preference were found in the variables of movement time and reaction time. However, the data trend of the 4 testing conditions varied according to presence of visuospatial neglect and side of lesion. Conclusions-Offering choices for the treatment activities and incorporating functional goals to therapeutic tasks might enhance response rate or movement efficiency, depending on the side of the lesion and presence of visuospatial neglect. The findings suggest that the consideration of the neglect phenomenon is a necessity when rehabilitative treatment planning incorporates constraint factors.

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Section: Movement Kinematicsmentioning

confidence: 99%

Effects of Task Goal and Personal Preference on Seated Reaching Kinematics After Stroke

Wong

Lin

et al. 2001

Stroke

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“…Thelen, Skala, and Kelso (1987) used this technique to probe the nature of interlimb coordination during spontaneous kicking in 6-week-old human infants. Small weights were added to the left or right leg.…”

mentioning

confidence: 99%

Spontaneous kicking behavior in infants: Age-related effects of unilateral weighting

Vaal¹,

Soest²,

Hopkins³

2000

Dev. Psychobiol.

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“…The first draws on mechanisms of pattern generation, which have been directly observed in animals (see Grillner, 1981), as well as dynamical systems theory (e.g., Fentress, 1976;Kent & Hodge, 1990;Thelen & Cooke, 1987;Thelen & Fisher, 1983;Thelen, Skala, & Kelso, 1987; Thelen & Urich, 1991). A dynamic pattern perspective might suggest that speech movements emerge gradually through an interaction of context (i.e., external conditions) with intrinsically generated patterns stemming from the rhythmic movements of sucking, chewing, reduplicated babbling, and variegated babbling.…”

Section: Introductionmentioning

confidence: 99%

Does Speech Emerge From Earlier Appearing Oral Motor Behaviors?

Moore

Ruark

1996

J Speech Lang Hear Res

105

114

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This investigation was designed to quantify the coordinative organization of mandibular muscles in toddlers during speech and nonspeech behaviors. Seven 15-month-olds were observed during spontaneous production of chewing, sucking, babbling, and speech. Comparison of mandibular coordination across these behaviors revealed that, even for children in the earliest stages of true word production, coordination was quite different from that observed for other behaviors. Production of true words was predominantly characterized by relatively stronger coupling among all mandibular muscles compared with earlier-emerging chewing and sucking. Variegated babbling exhibited stronger coupling than reduplicated babbling, as well as chewing and sucking. The finding of coupled activation among mandibular antagonists during speech paralleled earlier comparisons of adult speech and nonspeech behaviors (Moore, Smith, & Ringel, 1988) and did not support the suggestion that speech coordination emerges from earlier appearing oral motor behaviors. Keywordsspeech; development; motor control; mandible; human A persistent question in our understanding of the coordinative framework of speech production is the relationship of speech to other oral motor behaviors (Moore, Smith, & Ringel, 1988;Ostry, Feltham, & Munhall, 1984;Ostry & Munhall, 1994). Although recent investigations have provided strong support for the existence of separate and distinct mechanisms for speech and nonspeech coordination in adults (Moore et al., 1988), empirical physiologic studies of speech development are lacking. This lack of evidence leaves in doubt the essential foundations of speech motor control.Two lines of reasoning can be taken to address the coordinative framework of speech during the early stages of development. The first draws on mechanisms of pattern generation, which have been directly observed in animals (see Grillner, 1981), as well as dynamical systems theory (e.g., Fentress, 1976;Kent & Hodge, 1990;Thelen & Cooke, 1987;Thelen & Fisher, 1983;Thelen, Skala, & Kelso, 1987; Thelen & Urich, 1991). A dynamic pattern perspective might suggest that speech movements emerge gradually through an interaction of context (i.e., external conditions) with intrinsically generated patterns stemming from the rhythmic movements of sucking, chewing, reduplicated babbling, and variegated babbling. NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author ManuscriptAn alternative approach holds that speech develops independent of extant behaviors, emerging as a new and unique motor skill. Support for this position is drawn directly from observations of babbling rhythmicity (see summary by Kent, Mitchell, & Sancier, 1991) and further relies on findings that the coordinative organization of mature speech is distinct from that of any of the postulated precursors (Moore et al., 1988;Ostry & Munhall, 1994). The established orofacial coordination available to children from these behaviors does not appear to be well suited to speech. For example, kinematic and po...

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The dynamic nature of early coordination: Evidence from bilateral leg movements in young infants.

Cited by 104 publications

References 54 publications

Effects of Task Goal and Personal Preference on Seated Reaching Kinematics After Stroke

Effects of Task Goal and Personal Preference on Seated Reaching Kinematics After Stroke

Spontaneous kicking behavior in infants: Age-related effects of unilateral weighting

Does Speech Emerge From Earlier Appearing Oral Motor Behaviors?

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