Lecture 9 - Neuronal diversity + dendritic processing Flashcards
in the equation for voltage attenuation in different cables (dendrites) what does x stand for? what does lambda stand for?
x = distance
lambda = space constant
which 2 things determine the space constant in the equation for voltage attenuation?
resistance, diamater
if a neuron has a higher resistance (i.e has more myelin), the charge is kept in the structure better. therefore, what happens to the exponential curve?
shortens
explain what is meant by voltage attenuation in regards to dendrites? what shape does the curve make on the graph? what about open ended cables?
you begin with a large voltage, some leaks out giving an exponential curve - open ended cables collapse quicker as charge will just seep/flow out at the end
the electrotronic distance is the same as the rise time of an …..
EPSP
low impedence structures have ….. decrease in voltage as they go from being ….. to …..
small, large, smaller
high impedence structures have ….. decreases in voltage as they go from being …. to …..
large, smaller, large
if you have a low impedence next to a high impedence structure, what is it called?
impedence mismatch
two excitatory inputs onto different dendrites is called what?
local shunting - sublinear
inhibitory and excitatory synapses on different dendrites is called what?
additional shunting
dendritic …… affects the flow of charge
shape
active conductances can give rise to ……. summation, where the timing of events is critical
supralinear