8-2

Question 1

3 areas of the motor cortex

Answer 1

Primary motor cortex (M1)
Premotor cortex
Supplementary motor area

Question 2

Premotor cortex

Answer 2

Involved in the selection of
appropriate motor plans for
voluntary movements
Preparing complex tasks
Stimulation at high level of current
produces complex movement
Projects/relays info to M1

neuron signals preparation for movement

Question 3

Supplementary motor area

Answer 3

Programming complex sequences of movements and
coordinating bi-lateral movements
Based on remembered/previous sequences of movements
(Premotor based on sensory)
Responds to sequences of movements and to mental
rehearsal of sequences of movements

Question 4

Primary motor cortex (M1)

Answer 4

Motor Homunculus
DOES NOT represent activity of
individual muscles
Elicits movements of individual
body parts involving multiple
muscles

Relays motor commands to the alpha
motor neurons via corticospinal motor
neurons
Commence discharging/firing 5-100 ms
prior to movement
Corticospinal motor neurons

Question 5

what does the primary motor cortex encode for

Answer 5

Encodes the force of movement
Encodes the direction of movement
Encodes the speed of movement

Question 6

Electroencephalography (EEG)

Answer 6

Record the electrical activity underneath scalp
Excellent temporal resolution
Poor spatial resolution

Question 7

Electroencephalography (EEG)

Answer 7

Record the electrical activity underneath scalp
Excellent temporal resolution
Poor spatial resolution

Question 8

Functional magnetic resonance imaging (fMRI)

Answer 8

Premise: Activity involves metabolic demand
Measure blood flow within cortex - Comparison of
deoxygenated blood versus oxygenated blood
Poor temporal resolution
Excellent spatial resolution

Question 9

Transcranial Magnetic Stimulation (TMS)

Answer 9

Magnetic field to cause a depolarization
of cortical neurons
Selectively determine what region of
cortex to investigate