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Related Concept Videos

Muscle Stimulation Frequency01:22

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
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Related Experiment Video

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Irrelevant Stimuli and Action Control: Analyzing the Influence of Ignored Stimuli via the Distractor-Response Binding Paradigm
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Incongruency in the Response Priming Paradigm Influences Speech Muscle Activity.

Zoe Kriegel1, Adam M Fullenkamp2, Jason A Whitfield2

  • 1Division of Communication Disorders, University of Wyoming, Laramie.

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Summary

Cognitive-linguistic conflict increased facial muscle activity before speech. However, lip and jaw movements remained consistent, suggesting peripheral speech motor control can be influenced by cognitive factors.

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Area of Science:

  • Speech motor control
  • Cognitive-linguistics
  • Biomechanics

Background:

  • Understanding the interplay between cognitive processes and speech production is crucial.
  • Investigating peripheral speech mechanisms provides insights into motor control.

Purpose of the Study:

  • To examine how a verbal response priming paradigm affects lip-jaw kinematics and facial muscle activity.
  • To compare these effects during verbal responses under different conditions.

Main Methods:

  • Thirty young adults performed choice response and response priming tasks with color words.
  • Acoustic, optical kinematic, and perioral electromyographic data were collected.
  • Congruent and incongruent prime-target trials were used in the response priming task.

Main Results:

  • Facial muscle activity was higher before speech in incongruent response priming trials.
  • Verbal response times were longer for incongruent prime-target pairs.
  • Lip and jaw kinematic range and variability were consistent across conditions.

Conclusions:

  • Cognitive-linguistic conflict can modify peripheral speech motor control.
  • Individual variability in responses may indicate a range for healthy populations.
  • Further research should explore these effects in individuals with motor speech disorders.