Some effects of work loading in a repetitive motor task.

1954 ◽  
Vol 48 (6) ◽  
pp. 455-467 ◽  
Author(s):  
Ina McD. Bilodeau ◽  
Edward A. Bilodeau
Keyword(s):  
Motor Task ◽  
Repetitive Motor

scholarly journals An Agent-Specific Stochastic Model of Generalized Reaching Task Difficulty

2021 ◽  
Vol 11 (10) ◽  
pp. 4330
Author(s):  
Andrea Lucchese ◽  
Salvatore Digiesi ◽  
Kübra Akbaş ◽  
Carlotta Mummolo
Keyword(s):  
Stochastic Model ◽  
Task Difficulty ◽  
Motor Task ◽  
Younger Adults ◽  
Reaching Task ◽  
Index Of Difficulty ◽  
Young Subjects ◽  
Aged Subjects ◽  
Spatial Trajectories ◽  
Repetitive Motor

The ability of an agent to accomplish a trajectory during a certain motor task depends on the fit between external (environment) and internal (agent) constraints, also known as affordance. A model of difficulty for a generalized reaching motor task is proposed as an affordance-related measure, as perceived by a specific agent for a given environment and task. By extending the information-based Index of Difficulty of a trajectory, a stochastic model of difficulty is formulated based on the observed variability of spatial trajectories executed by a given agent during a repetitive motor task. The model is tested on an experimental walking dataset available in the literature, where the repetitive stride movement of differently aged subjects (14 “old” subjects aged 50–73; 20 “young” subjects aged 21–37) at multiple speed conditions (comfortable, ~30% faster, ~30% slower) is analyzed. Reduced trajectory variability in older as compared to younger adults results in a higher Index of Difficulty (slower: +24%, p < 0.0125; faster: +38%, p < 0.002) which is interpreted in this context as reduced affordance. The model overcomes the limits of existing difficulty measures by capturing the stochastic dependency of task difficulty on a subject’s age and average speed. This model provides a benchmarking tool for motor performance in biomechanics and ergonomics applications.

Some effects of work loading in a repetitive motor task.

1955 ◽  
Author(s):  
Ina Mcd. Bilodeau ◽  
Edward A. Bilodeau
Keyword(s):  
Motor Task ◽  
Repetitive Motor

scholarly journals Sound representation in higher language areas during language generation

2015 ◽  
Vol 112 (6) ◽  
pp. 1868-1873 ◽  
Author(s):  
Lorenzo Magrassi ◽  
Giuseppe Aromataris ◽  
Alessandro Cabrini ◽  
Valerio Annovazzi-Lodi ◽  
Andrea Moro
Keyword(s):  
Neural Activity ◽  
Motor Task ◽  
Read Aloud ◽  
Dominant Hand ◽  
Broca’S Area ◽  
Broca's Area ◽  
Language Generation ◽  
Electrophysiological Activity ◽  
Language Areas ◽  
Repetitive Motor

How language is encoded by neural activity in the higher-level language areas of humans is still largely unknown. We investigated whether the electrophysiological activity of Broca’s area correlates with the sound of the utterances produced. During speech perception, the electric cortical activity of the auditory areas correlates with the sound envelope of the utterances. In our experiment, we compared the electrocorticogram recorded during awake neurosurgical operations in Broca’s area and in the dominant temporal lobe with the sound envelope of single words versus sentences read aloud or mentally by the patients. Our results indicate that the electrocorticogram correlates with the sound envelope of the utterances, starting before any sound is produced and even in the absence of speech, when the patient is reading mentally. No correlations were found when the electrocorticogram was recorded in the superior parietal gyrus, an area not directly involved in language generation, or in Broca’s area when the participants were executing a repetitive motor task, which did not include any linguistic content, with their dominant hand. The distribution of suprathreshold correlations across frequencies of cortical activities varied whether the sound envelope derived from words or sentences. Our results suggest the activity of language areas is organized by sound when language is generated before any utterance is produced or heard.

The effect of an amount-set on a repetitive motor task.

1951 ◽  
Vol 42 (1) ◽  
pp. 39-43
Author(s):  
Sherman Ross ◽  
P. D. Bricker
Keyword(s):  
Motor Task ◽  
Repetitive Motor

scholarly journals EEG oscillations: how are they modulated during different phases of repetitive movements?

2017 ◽  
Vol 118 (1) ◽  
pp. 4-6
Author(s):  
Antonella Macerollo ◽  
Matt J. N. Brown
Keyword(s):  
Source Localization ◽  
Amplitude Modulation ◽  
Motor Task ◽  
Motor Program ◽  
Voluntary Movements ◽  
Relative Timing ◽  
Cortical Oscillations ◽  
Repetitive Movements ◽  
Neuronal Groups ◽  
Repetitive Motor

Voluntary movements are planned through the relative timing between submovements of movement sequences as part of the motor program. Different movement phases are characterized by specific amplitude modulation of cortical oscillations. The latter represent neurophysiological correlates of specific synchronization or desynchronization of different neuronal groups. In this Neuro Forum, we review recent evidence regarding the temporal relation between neurophysiological correlates of different phases of a repetitive motor task using electroencephalography and source localization using individualized MRI.

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