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Neuronerd.


20h
comment Refractory period in action potential
@SatwikPasani I'd say that's a great answer, would you like to add it as one?
Jul
20
comment How does the frequency of a visual stimulus affect the steady-state visually evoked potential?
I corrected your title since the SSVEP is the pattern in the EEG activity and is not the stimulus for it.
Jul
16
comment To measure Na/K channel activation in membrane level?
This is probably not possible in vivo, but there are various methods (voltage clamping, channel blockers) that you can use in vitro with individual cells and perhaps correlate the results with the aggregate activity of a larger piece of heart muscle.
Jul
2
comment Kinesin-5 / cytoplasmic dynein spatial density distribution in neurons
I have next to no knowledge of this area, but I do know that Peter Baas has done extensive studies of Kinesin-5 in neuronal growth cones during development. I mention that in the off chance that some of his imaging techniques might be helpful to you.
Jun
24
comment Can human change its morphology or anatomy due to ecological changes?
I went ahead and changed it, as other people are going to come in trying to correct it as well.
Jun
22
comment Is it possible to get infected with HIV from old blood?
It's important to define how old is "old", here, I think. I rephrased the question a bit so that it focuses more on the science than an individual diagnosis.
Jun
19
comment How is information sent from limbs to the brain exactly?
If this is something that you are interested in, the rat whisker system is the model used for decoding some of these pathways. The earlier connections are different (it's a nerve that goes directly to the brainstem), but the cortical layout is similar.
Jun
19
comment How is information sent from limbs to the brain exactly?
(for example, the roots for the arms enter between the vertebrae of the cervical region -- en.wikipedia.org/wiki/Dermatome_%28anatomy%29, legs in the lumbar, etc.)
Jun
19
comment How is information sent from limbs to the brain exactly?
@user2721465 It's not necessarily a 1-1 relationship between skin receptive field and column in the cortex (there are higher level "abstractions" in the cortex such as orientation of the stimulus, etc.). Since the information is being "filtered", there are complex relationships between the thalamic cells, and there's some degree of consolidation that goes on. The bundles of axons are converging on the cord at different levels (see a map of the dermatomes for the mapping), but the tracts are quite thick anatomically, so there's many thousands of axons in one nerve bundle.
Jun
19
comment How is information sent from limbs to the brain exactly?
This is a bit of a work in progress, but it should give you some terms to google, etc.
Jun
19
comment How is information sent from limbs to the brain exactly?
@user2721465 I will try to address some of these questions in my answer.
Jun
19
comment How is information sent from limbs to the brain exactly?
For a quick primer, see en.wikipedia.org/wiki/Receptive_field#Somatosensory_system, but hopefully I (or someone else) can come along and fill in the gaps in a bit.
Jun
4
comment Religion and Genetics
See this related CogSci question, but the answer cites the same references as below.
May
20
comment What is atrial fibrillation?
@Chris I would not mind at all if you (or anyone else) wanted to take that opportunity.
May
18
comment What is atrial fibrillation?
@Chris My point was more that this was answered quite well by the first hit on googling "atrial fibrillation ekg". Wikipedia's chart is actually better, but I don't want to just copy large quantities of information from there.
May
18
comment What is atrial fibrillation?
en.ecgpedia.org/wiki/Atrial_Fibrillation pretty much has exactly what you are after.
Apr
22
comment Why is it that drinking caffeinated tea does not help one to stay awake?
I have given it a try, you can always modify it again if necessary.
Apr
13
comment Which reflex arcs work in Heart with extrasystoles?
Not to be fussy about it, but it will help someone searching for your question.
Apr
7
comment What is this abbreviation CT in female reproductive system
I found this as well, and it is a fact about the ovaries.
Mar
16
comment spinal cord lesion and result in somatic sensation
For the sensation aspect, dermatomes are a big hint. They will give you a rough idea of some of the motor neuron projections. I'd recommend trying to fill in all that you can and ask specific questions about the portions you don't understand (in the form of "Okay, I know that X ascending tract has been likely damaged, so there's likely to not be any information about Y propagating above a certain level...so, will this mean...") rather than just dropping off the assignment. This is a very useful exercise :)