2,076 reputation
622
bio website github.com/yamad
location Boston, MA
age 29
visits member for 3 years
seen Dec 11 at 3:02

PhD candidate in neurobiology/neuroscience. Current research focused on membrane electrophysiology.


Jan
29
revised Do adjacent axons in a nerve influence each other?
added 562 characters in body
Jan
29
answered Do adjacent axons in a nerve influence each other?
Jan
25
comment Why have humans evolved conciousness?
-1. The substantive part of this answer assumes the common misconception that only humans are intelligent and conscious, and that we somehow know this for a fact.
Jan
25
comment Why have humans evolved conciousness?
-1. Your question and comments are philosophical, not biological, and therefore not appropriate for this site. You seem to believe that evolution can't possibly explain it, and therefore there is really no science to be discussed. Read up on the philosopher David Chalmers, who agrees with you. Then read up on his main rival, Daniel Dennett. Note that when you get into these sorts of questions, your intuition about whether you "know" that you are "self-aware" and how to "prove" it are destined to fail.
Dec
14
awarded  Yearling
Nov
29
awarded  Revival
Nov
28
comment Action Potential Distribution On Synapses
@Armatus, the ions that flow in through ion channels during the action potential are almost certainly not the same ions that carry current axially to depolarize adjacent sites. The charge travels (that's what current is) but the ion fluxes are local.
Nov
28
comment Action Potential Distribution On Synapses
Threshold is not fixed, even within a single neuron over short periods of time. Fundamentally, threshold is reached when enough voltage-gated sodium channels open so that a rapid depolarization occurs--that is, when inward current is much greater than outward current. When this occurs is a complicated function of membrane resistance, leak currents, the recent history of the membrane, other inward currents present, the kinetics and voltage-dependence of outward currents, etc., etc.
Nov
28
answered Action Potential Distribution On Synapses
Nov
28
comment How do neurons form new connections in brain plasticity?
Like @nico says, there is a lot of literature on dendritic "reshaping" (see, for instance, biology.stackexchange.com/q/8/72). I'd say that dendritic reshaping is discussed with about as much frequency as axonal reshaping.
Nov
28
revised Does the speed of electrical impulses through neurones decrease with age?
added 250 characters in body
Nov
28
answered Does the speed of electrical impulses through neurones decrease with age?
Nov
28
comment Action Potential Distribution On Synapses
Can you revise your question? I am not sure what you mean when you say the "whole 40 mV is distributed" versus "a total 40 mV" which is "not there."
Nov
28
comment How and where, in the human brain, are memories stored?
For a little more on ways in which the nervous system is plastic, see my answer here biology.stackexchange.com/a/1359/72
Nov
28
answered Is nicotine toxic to humans?
Nov
22
awarded  Nice Answer
Aug
25
awarded  Good Answer
Jun
19
awarded  Enlightened
Jun
7
comment Understanding Membrane / Resting Potential from the perspective of ions?
The resting potential is only validly called an equilibrium potential in a system containing only one ion species. Of course, cell environments are composed of several ions so the resting potential is not described by any equilibrium potential, because (as you say) the system is at steady-state rather than equilibrium. A more general term is "reversal potential" which describes the potential at which net current switches sign (e.g., inward to outward). The concept of reversal potential simplifies to a Nernst/equilibrium potential in single ion cases, but also covers multiple ion cases.
Jun
6
revised How and where, in the human brain, are memories stored?
added some references