Could someone help me with these questions please:
1. Why action potentials recorded with 2 extracellular electrodes from
a single nerve fibre or whole nerve are usually biphasic? I was
thinking that is a recording artifact due to the 2 elctrodes,is it
right?
2. What are the advantages in using square-waves electrical stimuli
ocer other types of stimuli(eg. sinusoidal) for excitation of nerves
or muscle?
3. Why the threshold for nerve or muscle excitation witha square wave
electrical stimulus depends both on the amplitude and duration of
the stimulus?
Thanks
Jenny