Question 1

A baseball pitcher is preparing to throw a ball. Which brain region is primarily responsible for the strategy phase of this movement, such as deciding to pitch a fastball?

Accepted Answer

Neocortex

Question 2

Which descending spinal tract is most important for voluntary fine movements of the fingers and arms, such as gripping a baseball?

Accepted Answer

Corticospinal tract

Question 3

Damage to the right motor cortex or corticospinal tract due to a stroke will most likely result in which of the following symptoms?

Accepted Answer

Paralysis on the left side of the body

Question 4

Which pathway is primarily responsible for maintaining posture and balance during the wind-up phase of a baseball pitch?

Accepted Answer

Ventromedial pathway

Question 5

The pontine reticulospinal tract enhances antigravity reflexes by exciting extensor muscles. Which equation best describes the relationship between muscle tone ($$T) $$and extensor muscle activity ($$E) in $$this context?

Accepted Answer

$$T = k \cdot E$$

Question 6

Which brain region is most involved in the planning of complex movements, such as the sequence of actions required to throw a baseball?

Accepted Answer

Area 6 (SMA/PMA)

Question 7

Mirror neurons in the PMA fire when a monkey performs an action and when it observes another performing the same action. What is the significance of this for human behavior?

Accepted Answer

They may contribute to understanding actions and intentions of others

Question 8

A patient with Parkinson’s disease is experiencing bradykinesia and rigidity. Which neurotransmitter is most depleted in the affected brain region?

Accepted Answer

Dopamine

Question 9

L-Dopa is used to treat Parkinson’s disease because it can cross the blood-brain barrier and increase dopamine levels. Which equation best represents the conversion of L-Dopa ($$L) to $$dopamine ($$D) in $$the brain?

Accepted Answer

$$D = k \cdot L$$

Question 10

Which of the following is a symptom of Huntington’s disease, but NOT Parkinson’s disease?

Accepted Answer

Chorea (uncontrollable movements)

Question 11

During the execution phase of throwing a baseball, which pathway is primarily responsible for activating motor neurons controlling the fingers?

Accepted Answer

Lateral pathway

Question 12

Which brain structure is most involved in the proper execution of planned, voluntary, multi-joint movements, such as throwing a ball?

Accepted Answer

Cerebellum

Question 13

A lesion in the cerebellum can cause ataxia. Which of the following best describes ataxia?

Accepted Answer

Uncoordinated and inaccurate movements

Question 14

Which equation best represents the population coding of movement direction in M1, where $$V is $$the population vector and $$v_i is $$the direction vector of neuron $$i$$?

Accepted Answer

$$V = \sum_{i=1}^{n} v_i$$

Question 15

Which tract originates in the superior colliculus and mediates reflex postural movements of the head in response to visual and auditory stimuli?

Accepted Answer

Tectospinal tract

Question 16

Which of the following best describes the function of the basal ganglia in movement control?

Accepted Answer

Controls selection and initiation of voluntary movements

Question 17

Which pathway is most likely to be engaged when a pitcher walks to the mound, maintaining upright posture and balance?

Accepted Answer

Ventromedial pathway

Question 18

Which of the following is a direct effect of electrical stimulation of area 4 (M1) in the motor cortex?

Accepted Answer

Twitch of muscles in a particular body region

Question 19

Which brain region receives major input from the basal ganglia and projects to area 6, helping coordinate and plan movement?

Accepted Answer

Ventral lateral (VL) nucleus of the thalamus

Question 20

Which of the following best describes the effect of a medullary (lateral) reticulospinal tract lesion?

Accepted Answer

Inhibition of extensor muscles and liberation from reflex control

Brain Control of Movement: Hierarchical and Neural Pathways in Motor Function

Guida di studio - Domande di pratica

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