Questions tagged [electrophysiology]
For questions about the study and measurement of the electrical activity of neurons
65
questions
1
vote
1
answer
28
views
Methods for comparing extracellular neural response structure to auditory stimulus structure
I have two arrays, one representing an auditory stimulus and the other representing neural activity from auditory cortex. The auditory stimulus has known temporal and spectral structure. The neural ...
- 55
1
vote
0
answers
14
views
Literature reviews on nerve conduction velocity?
The Wikipedia article for nerve conduction velocity is frustrating because it lacks citations. What is a good survey or overview of the research on nerve conduction velocity?
I'm particularly ...
- 111
1
vote
1
answer
57
views
What is the difference between "electrode" and "pad" on extracellular probes?
Some authors seem to use these terms interchangeably, others distinctly.
What is a pad? How is it different from an electrode? Is a pad where stimulation can happen? Can recording also happen at a pad?...
- 55
0
votes
0
answers
23
views
Can disease, drugs, or other physiological conditions violate the all-or-none rule for action potential?
We are taught that the amplitude of a neuron's spike is always the same (within a negligibly small range)--all or none. But it seems that anomalous physiological conditions like certain diseases or ...
- 11
4
votes
2
answers
120
views
Why does EOG (eye EEG) spike and fall back down when you look to one direction?
Why does EOG (eye EEG) first spike and then immediately fall back down when you look to one direction instead of staying spiked and only falling back down when your eyes go back to neutral?
From what ...
0
votes
0
answers
78
views
What is the "reverse-averaging" technique used in Electroencephalography (EEG)?
Im reading about the Bereitschaftspotential or Readiness-potential "discovery" and I see it was done by "reverse-averaging" the ressults of using EEG to measure certain voltage ...
- 1
1
vote
1
answer
42
views
Measuring spike activity with an electrode: using the principles present in galvanic cells, can one explain how current flows in the electrode system?
Thank you for reading this.
In a galvanic cell setup and around each electrode in that setup, we have species that either undergo oxidation or reduction—resulting in the literal flow of electrons ...
- 11
3
votes
1
answer
54
views
Are brainwaves from an EEG meaningful measurements?
I realized that research describing the different stages of sleep all rely on the assumption that we can accurately determine the stage of sleep using an EEG. I wondered if brainwaves are anything ...
- 33
2
votes
1
answer
510
views
How to calculate Fano Factor for spike train data?
I've heard this used many times but never had to do it myself. How does one calculate Fano Factor (FF) for spike train data?
Let's say that you have for some neuron the spike count in a certain time ...
- 21
1
vote
1
answer
2k
views
What are the differences between bipolar channels and monopolar channels for EEG?
In EEG, each electrode records a biopotential which must be compared to a reference biopotential in order to obtain a channel of measurement. Two types of channels are the so-called bipolar channels ...
- 532
1
vote
1
answer
55
views
Electric communication between single neurons
It is believed that neurons communicate through neurotransmitters, released from multiple synapses and flow to the axon of the next neuron. But has it been shown if a single neuron communicate with a ...
- 11
3
votes
1
answer
56
views
where is the second electrode in case of electrostimulation
With electrostimulation or functional electrostimulation, a response from the neuron is generated by electrical impulses.
But I always read, for example, that a stimulating electrode is above position ...
- 31
2
votes
1
answer
76
views
What are the advantages of biphasic nerve stimulation?
One can stimulate nerves or muscle cells in different ways - with single-phase or multiphase pulses, cathodic or anodic, and via surface electrodes or implanted ones.
What exactly is the advantage of ...
- 21
3
votes
1
answer
97
views
Why are flat line EEG recordings not perfectly zero microvolt?
I just look at several flat line EEG brain waves and all of them are not exactly at zero microvolt, in the sense there seems to be always a small signal or irregularities to be seen, as well as ...
- 131
5
votes
2
answers
985
views
Why is it only positive charge that gets injected into a neuron when we inject a current into it?
Learning about the basics of theoretical neuroscience from the youtube lectures from Michale Fee's introduction to neural computation course.
We're considering a very simplified model of a neuron, ...
- 161