Lab 03 Neurophysiology

Which channel was the event marker plugged into

Channel 3

Name the channels and their units that appear on the Lab scribe data collection window when the correct experiment has been selected.

Reaction time: Volts

How do the subjects mean reaction time to visual signals compare to his or her mean reaction time to auditory signals

auditory signal time > visual signal time

What are muscle spindles

sensory receptors responsible for providing information about the length, or the rate of change of length of a muscle

Myotatic Reflex

involuntary muscle contraction that occurs when a muscle is sudddenly stretched

Which channel was the reflex hammer plugged into

channel z

name the channel and their units

A1: EMG QUAD (V)
A2: TENDON TAP BNC (V)

Is the patellar reflex inhibited or enhanced by voluntary muscle activity in the quadriceps

It is inhibited because the muscle is partially flexed, reducing the ability to stretch it further with the reflex hammer tap.

Jendrassik's Maneuver

voluntary muscle activity in another part of the body

Is the patellar reflex inhibited or facilitated during the Jendrassik's Maneuver (voluntary muscle activity in another part of the body)? Speculate on why.

It is facilitated. The voluntary muscle contraction sends signals to the spinal cord that can override some of the inhibitory signals that would normally dampen the reflex response.