X.Liu PSYC 5130 Monkey Joystick Performance Quiz

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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?

By summing the direction vectors of M1 neurons Signup and view all the answers

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

Firing most vigorously in one preferred direction Signup and view all the answers

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

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

What determines the direction of movement in M1?

A tally and averaging of votes from each neuron Signup and view all the answers

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

Finer motor control Signup and view all the answers

Which area is especially important for controlling movement?

Premotor Cortex (PMA) Signup and view all the answers

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

PET Signup and view all the answers

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

Supplementary Motor Area (SMA) Signup and view all the answers

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

Identification of cortical activation patterns through PET scans 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)?

Population of neurons encoding force and direction Signup and view all the answers

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

Produces contralateral muscle twitching Signup and view all the answers

What is required for goal-directed, voluntary movement?

Memory retention of the movement plan Signup and view all the answers

What did Wilder Penfield contribute to the field of neurosurgery?

Pioneered epilepsy treatment Signup and view all the answers

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

Randomly positioned lights Signup and view all the answers

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

Detailed mapping of muscle groups Signup and view all the answers