nerve_stimulation.mat

Nerve stimulation data file

stim~/stimulus (name)/type-fascicle%d.mat contains the data for response thresholds and spike-time, location pairs to extracellular stimulation for the given axon type (Gaines, Sundt, or MRG; see models.axon_model), as computed by models.nerve_stimulation. This data is used by plots.view_thresholds and plots.preview_spike.

The variables saved in each of these stimulation.mat file are:

Variable	Type	Description
threshold	double, nAxons x 1	axon stimulation thresholds, µA
diameter	double, nAxons x 1	fibre (outer) diameters for each simulated axon
velocity	double, nAxons x 1	axon conduction velocity, m/s
g_ratio	double, nAxons x 1	axon g-ratio (myelinated models only)
results	struct array, nAxons x 1	struct containing responses to stimulation for each simulated axon, more details below.
spike_counts	integer, nAxons x nStimuli	How many spikes were generated in each axon for each level of the stimulus?
spike_fraction	double scalar	what fraction of the total number of axons of this class in this fascicle were simulated?
axon_index	integer, nAxons x 1	Indices into the axon population for the axons corresponding to this class and fascicle
stimulus	struct	stimulus waveform, see plots.preview_stimulus
pop	struct	Data about this axon population, see axons.mat for details about the pop structure. Each population which uses the model Type is grouped together. In addition, some extra data columns are defined:
pop.population_id	integer (nAxons x 1)	To which original population does each axon in this pop structure belong?
pop.source_total	integer (nMerged x nFascicles)	For each population and fascicle, how many axons were in the source population before downsampling?
pop.source_index	integer (nMerged x nFascicles)	What were the population axon indices before downsampling?
units	struct	information about the units for each variable.
notes	cell array of char	information about the execution environment and input files to models.axon_thresholds. Display using cellfun(@disp,notes).

Results structure

Variable	Type	Description
results.dt_dx	double scalar	delay in spike-time from one node to the next. related to reciprocal of conduction velocity.
results.spikes	struct	fibre (outer) diameters for each simulated axon
results.spikes.time	cell {1 x nStimuli} of double	spike arrival times at each node for each stimulus. See plots.preview_spike for a visualisation
results.spikes.node	cell {1 x nStimuli} of integer	spike arrival node indices. See plots.preview_spike for a visualisation
results.spikes.init	cell {1 x nStimuli} of cell of double	spike initiation times (i.e. spikes not preceeded by a nearby spike)
results.summary	double 1 x 3	threshold, internal current. conduction velocity, m/s. Actual simulated axon length, mm.
results.n_nodes	struct	numel(results.length)