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APK 4115 Exam 2 questions with correct answers.
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APK 4115 Exam 2 questions with correct answers.
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APK 4115 Exam 2 questions with correct answersMU recruitment Correct Answer-number of motor units activated
Discharge rate Correct Answer-rate at which MUs discharge action
potentials
Motor unit synchronization/common drive to the motor neuron pool
Correct Answer-coincidental MU discharge proportional to the common
drive
when you recruit additional MU what happens to the force outcome
Correct Answer-it increases and gets longer
when you increase the frequency of input ( 5Hz to 13 Hz) what happens
to the force outcome Correct Answer-amplitude gets higher
when you synchronize motor units what happens to the force outcome
Correct Answer-it increases the force
how can you prolong force Correct Answer-change the duration of input
how to control force precision Correct Answer-reduce MU discharge
rate variability
what is a hertz a unit for Correct Answer-frequency
,how many bumps do you see in one second when measuring MU
Correct Answer-one bump= one hertz
so if frequency is 5Hz, you see 5 bumps in 1 sec, if frequency is 13 Hz,
you see 13 bumps in 1 sec
No noise neural signal occurs where
how can you tell if it's a noisy neural signal Correct Answer-
Afterhyperpolarization
below the motor neuron excitation threshold that's at -65 mV
a noisy neural signal is a squiggle line in the afterhyperpolarization part
Noisy signals happen with what kind of discharge rate Correct Answer-a
variable discharge rate
the variability in the motor unit discharge may come from what two
things Correct Answer-1. synaptic noise
2. frequency modulation from higher centers
what are neural oscillations Correct Answer-brainwaves; rhythmic
neural activity
, -occur at a different frequency than the firing frequency of individual
neurons or oscillation of small groups of neighboring neurons
3 main levels of neural oscillations Correct Answer--spike trains
-local field potential (sum of electrical current from several neighboring
neurons)
-system oscillations (EEG)
frequency structure of WHITE NOISE Correct Answer-has equal
density at varying amounts of frequency
how to determine how many parabolas in 1 second of a frequency
structure Correct Answer-if the frequency is at 2 Hz, then there will be
two parabolas in one second
if the frequency is at 4 Hz, four parabolas count as one second
what is a frequency structure Correct Answer-the representation of the
signal in the frequency domain is referred to as the power density
spectrum
-it characterizes the relative amplitude (power) of each frequency over
the chosen range of frequencies
-TLDR: it decomposes the signal to tell you different frequencies as to
how the resulting outcome was produced
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