کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
928262 1474222 2015 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Testing the co-existence of two timing strategies for motor control in a unique task: The synchronisation spatial-tapping task
ترجمه فارسی عنوان
تست همبستگی دو استراتژی زمانی برای کنترل موتور در یک کار منحصر به فرد: کار همگام سازی فضایی
کلمات کلیدی
کنترل زمان، ریتمیکیشن، کنترل فضایی، نقطه لنگر، همزیستی، مسیر
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب شناختی
چکیده انگلیسی


• A unique task can be used to assess the coexistence of two strategies for motor timing.
• Time is the controlled parameter at slow tempi during event-based timing.
• Space is the controlled parameter at fast tempi during emergent timing.
• Motor timing strategies switch from time coding to trajectory coding under rhythmic pressure.

The control of rhythmic action sequences may involve two distinct timing strategies, i.e., event-based and emergent timing, which are usually revealed through finger-tapping and circle-drawing tasks, respectively. There is a lively debate concerning the possibility of coexistence of the two modes of timing for the execution of a single task. If one considers emergent timing as simply an absence of explicit representation of a time interval, then by definition, the two modes of timing cannot coexist. However, if one considers that emergent timing engages control of another motor parameter, e.g., a control of movement through space rather than time, then the possibility of coexistence needs to be reassessed. In the present study, we designed a hybrid of finger-tapping and circle-drawing tasks for which the demands for space and time control were present at the same time in order to reassess the coexistence hypothesis. Seventy-eight participants performed a spatial-tapping task in which finger taps were to be produced in synchrony with a regular metronome to 6 visual targets presented around a virtual circle. The metronome set ten distinct tempi (1100–300 ms). Using autocorrelation analyses on timing variables, we show that motor timing was event-based at slow tempi and emergent at faster tempi. Through an analysis of the trajectory, we confirm that an increase in the spatial control of movement took place congruently with a switch from event-based to emergent timing modes. At these fast tempi, timing and spatial errors were correlated but only at the specific target location for which a dynamical anchor point was revealed. Hence, we conclude that the coding of emergent timing has a spatial nature from which emerge timing regularities. This spatio-temporal strategy insures the performance of sequential motor actions when cognitive effort is too high for the use of pure event-based timing strategies.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Human Movement Science - Volume 43, October 2015, Pages 45–60
نویسندگان
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