In Experiment #1, you are targeting three different colored circles of the same

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In Experiment #1, you are targeting three different colored circles of the same size and same distance from a white circle. The text on Slide 5 asserts you that the time to target each color of circle should be identical. Were your times identical? If not, why not? (Note that 'identical' means exactly the same value.)

Select one:

a. Yes, my times were identical.

b. No, there must be something wrong with the timing on the webpage.

c. No, the circles must not really have been the same size and/or distance.

d. No, movement times are highly variable, and so the chances that three average times from a small number of trials will be identical is vanishingly small.

e. No, the device (mouse, trackpad, touchscreen, etc...) I used to point must be acting inconsistently.

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According to Fitts's Law:

1) The time to move to a target ________ as the distance to the target gets longer.

2) The time to move to a target ________ as the width of the target gets larger.

Select one:

a. 1) increases, 2) decreases

b. 1) decreases, 2) increases

c. 1) increases, 2) increases

d. 1) decreases, 2) decreases

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According to the simplified version of Fitts's Law on Slide 17, if a participant is reaching for a target whose center is 39 cm away and the target is 5 cm wide along the direction of reach, how long will it take?

Note: Answer with the number only and no units. You can round to 2 decimal places.

Note: Remember your rules of logarithms: loga(b) = logx(b) / logx(a)

Answer:

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According to Fitts's Law, would a person be faster to move their cursor on the computer screen to button X, which is 10 cm away and 2 cm wide, or to button Y, which is 30 cm away and 6 cm wide?

Select one:

a. Button X

b. Same time for both

c. Button Y

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Based solely on Fitts's Law, if you are designing a new keyboard, how should you design the keys that are used most often in order to increase typing speed?

Select one:

a. Make them bigger and/or farther from the resting position of the fingers.

b. Make them bigger and/or closer to the resting position of the fingers.

c. Make them smaller and/or closer to the resting position of the fingers.

d. Make them smaller and/or farther from the resting position of the fingers.

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Consider the results of Experiment #5, and the complete specification of Fitts's Law in Slide 24.

Now imagine we run an experiment where participants point at targets with either their finger or their elbow. Let's say we find that participants are able to initiate movements equally fast with both their finger and elbow, but the actual movements are slower with their elbow than their finger. How would this difference be represented in Fitts's Law?

(Hint: Notice the similarity to the equation for a line, y = a + bx.)

Select one:

a. Constant b would be larger for elbows.

b. Constant a would be larger for elbows.

c. There would be no difference.

d. Constant b would be smaller for elbows.

e. Constant a would be smaller for elbows.

Match each component of the motor system up with the best description of its role in motor control:

Cortical source of movement signals sent to brainstem and spinal cord

Control of eye movements

Coordination, error correction, and learning of fine skilled movements

Production of internally generated sequences of movements

Initiation and inhibition of movements and reward-based learning

Motor planning and awareness of motor intentions

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The premotor cortex is _____________ to the primary motor cortex.

Select one:

a. caudal

b. dorsal

c. rostral

d. medial

e. ventral

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The basal ganglia and the cerebellum are two important subcortical components of the motor system. The cerebellum is ______________ to the basal ganglia.

Select one:

a. posterior and superior

b. posterior and inferior

c. anterior and inferior

d. anterior and superior

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Expanding on the flexion reflex example shown in the animation, if the animal stepped on a sharp tack with the right hindlimb, what signals would be sent to the left hindlimb?

Select one:

a. Excitatory signal to the motor neurons for the extensor and flexor muscles.

b. Excitatory signal to the motor neurons for the extensor muscle, inhibitory signal to the motor neurons for the flexor muscle.

c. Inhibitory signal to the motor neurons for the extensor and flexor muscles.

d. Excitatory signal to the motor neurons for the flexor muscle, inhibitory signal to the motor neurons for the extensor muscle.

Cortical source of movement signals sent to brainstem and spinal cord

Answer 1Choose...Premotor cortexPrimary motor cortexSupplementary motor cortexCerebellumSuperior colliculusBasal ganglia

Control of eye movements

Answer 2Choose...Premotor cortexPrimary motor cortexSupplementary motor cortexCerebellumSuperior colliculusBasal ganglia

Coordination, error correction, and learning of fine skilled movements

Answer 3Choose...Premotor cortexPrimary motor cortexSupplementary motor cortexCerebellumSuperior colliculusBasal ganglia

Production of internally generated sequences of movements

Answer 4Choose...Premotor cortexPrimary motor cortexSupplementary motor cortexCerebellumSuperior colliculusBasal ganglia

Initiation and inhibition of movements and reward-based learning

Answer 5Choose...Premotor cortexPrimary motor cortexSupplementary motor cortexCerebellumSuperior colliculusBasal ganglia

Motor planning and awareness of motor intentions

Answer 6Choose...Premotor cortexPrimary motor cortexSupplementary motor cortexCerebellumSuperior colliculusBasal ganglia

Explanation / Answer

#1 If you are target three different colored circles of the same size and same distance from a white circle, the time to target each color of circle would not be identical. It is highly impossible for the time to target each colour of circle to be the same or even identical. This is because the movement time is highly variable, it cannot be the same. So the chances that three average times from a small number of trials will be identical is vanishingly small.

Thus, the correct answer is option, D.

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