X.Liu PSYC 5130 Monkey Joystick Performance Quiz
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Questions and Answers

Why were the M1 cells considered to have pretty coarse directional tuning?

  • Their firing rate was low during movement
  • They were not active during movement
  • They fired vigorously in only one direction
  • They discharged during movements in a wide range of directions (correct)
  • What was the primary observation about monkeys' movements despite the coarse directional tuning of M1 cells?

  • Monkeys used a different brain region for movement
  • Monkeys were very fast in their movements
  • Monkeys showed very precise and accurate movements (correct)
  • Monkeys showed erratic movements
  • What does summing the direction vectors of many M1 neurons during movement help predict?

  • The muscle groups involved
  • The distance traveled
  • The speed of movement
  • The movement direction (correct)
  • How did the population vector approach predict movement direction?

    <p>By summing the direction vectors of M1 neurons</p> Signup and view all the answers

    What was a notable feature of M1 cells' firing pattern during monkey joystick performance?

    <p>Firing most vigorously in one preferred direction</p> Signup and view all the answers

    In monkey joystick performance experiments, what was an unexpected finding regarding brain activity and behavior?

    <p>The brain was more accurate than behavior in predicting movements</p> Signup and view all the answers

    What determines the direction of movement in M1?

    <p>A tally and averaging of votes from each neuron</p> Signup and view all the answers

    What is the consequence of having a larger population of neurons in terms of motor control?

    <p>Finer motor control</p> Signup and view all the answers

    Which area is especially important for controlling movement?

    <p>Premotor Cortex (PMA)</p> Signup and view all the answers

    What experimental method was used to monitor changes in cortical activation during voluntary movements in humans?

    <p>PET</p> Signup and view all the answers

    Which area remained active when subjects rehearsed finger movements mentally without actually moving their fingers?

    <p>Supplementary Motor Area (SMA)</p> Signup and view all the answers

    What evidence suggests that the Supplementary Motor Area (SMA) and Premotor Cortex (PMA) are involved in initiating movements?

    <p>Identification of cortical activation patterns through PET scans</p> Signup and view all the answers

    What is the primary focus of the new view on how movement is coded in the primary motor cortex (M1)?

    <p>Population of neurons encoding force and direction</p> Signup and view all the answers

    What effect does weak electrical stimulation of the Primary Motor Cortex (M1) have on muscles?

    <p>Produces contralateral muscle twitching</p> Signup and view all the answers

    What is required for goal-directed, voluntary movement?

    <p>Memory retention of the movement plan</p> Signup and view all the answers

    What did Wilder Penfield contribute to the field of neurosurgery?

    <p>Pioneered epilepsy treatment</p> Signup and view all the answers

    In the context of monkey joystick performance, what do monkeys learn to move toward?

    <p>Randomly positioned lights</p> Signup and view all the answers

    What was the traditional belief regarding movement coding in M1 focusing on?

    <p>Detailed mapping of muscle groups</p> Signup and view all the answers

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