Multi-taper event triggered time-frequency spectrum - binned point process
Usage:
[S,f,R,Serr]=mtspectrumtrigpb(data,E,win,params,fscorr)
Input:
data (single channel data) -- required
E (event times) - required
win (in the form [winl winr] i.e window around each event
required
Note that units here have
to be consistent with
units of Fs
params: structure with fields tapers, pad, Fs, fpass, err, trialave
- optional
tapers : precalculated tapers from dpss or in the one of the following
forms:
(1) A numeric vector [TW K] where TW is the
time-bandwidth product and K is the number of
tapers to be used (less than or equal to
2TW-1).
(2) A numeric vector [W T p] where W is the
bandwidth, T is the duration of the data and p
is an integer such that 2TW-p tapers are used. In
this form there is no default i.e. to specify
the bandwidth, you have to specify T and p as
well. Note that the units of W and T have to be
consistent: if W is in Hz, T must be in seconds
and vice versa. Note that these units must also
be consistent with the units of params.Fs: W can
be in Hz if and only if params.Fs is in Hz.
The default is to use form 1 with TW=3 and K=5
pad (padding factor for the FFT) - optional (can take values -1,0,1,2...).
-1 corresponds to no padding, 0 corresponds to padding
to the next highest power of 2 etc.
e.g. For N = 500, if PAD = -1, we do not pad; if PAD = 0, we pad the FFT
to 512 points, if pad=1, we pad to 1024 points etc.
Defaults to 0.
Fs (sampling frequency) - optional. Default 1.
fpass (frequency band to be used in the calculation in the form
[fmin fmax])- optional.
Default all frequencies between 0 and Fs/2
err (error calculation [1 p] - Theoretical error bars; [2 p] - Jackknife error bars
[0 p] or 0 - no error bars) - optional. Default 0.
trialave (average over events when 1, don't average when 0) -
optional. Default 0
fscorr (finite size corrections, 0 (don't use finite size corrections) or
1 (use finite size corrections) - optional
(available only for spikes). Defaults 0.
Output:
S (triggered spectrum in form frequency x events for trialave=0,
or as a function of frequency for trialave=1)
f (frequencies)
R (spike rate)
Serr (error bars) - only for err(1)>=10001 function [S,f,R,Serr]=mtspectrumtrigpb(data,E,win,params,fscorr) 0002 % Multi-taper event triggered time-frequency spectrum - binned point process 0003 % 0004 % Usage: 0005 % 0006 % [S,f,R,Serr]=mtspectrumtrigpb(data,E,win,params,fscorr) 0007 % Input: 0008 % data (single channel data) -- required 0009 % E (event times) - required 0010 % win (in the form [winl winr] i.e window around each event 0011 % required 0012 % Note that units here have 0013 % to be consistent with 0014 % units of Fs 0015 % params: structure with fields tapers, pad, Fs, fpass, err, trialave 0016 % - optional 0017 % tapers : precalculated tapers from dpss or in the one of the following 0018 % forms: 0019 % (1) A numeric vector [TW K] where TW is the 0020 % time-bandwidth product and K is the number of 0021 % tapers to be used (less than or equal to 0022 % 2TW-1). 0023 % (2) A numeric vector [W T p] where W is the 0024 % bandwidth, T is the duration of the data and p 0025 % is an integer such that 2TW-p tapers are used. In 0026 % this form there is no default i.e. to specify 0027 % the bandwidth, you have to specify T and p as 0028 % well. Note that the units of W and T have to be 0029 % consistent: if W is in Hz, T must be in seconds 0030 % and vice versa. Note that these units must also 0031 % be consistent with the units of params.Fs: W can 0032 % be in Hz if and only if params.Fs is in Hz. 0033 % The default is to use form 1 with TW=3 and K=5 0034 % 0035 % pad (padding factor for the FFT) - optional (can take values -1,0,1,2...). 0036 % -1 corresponds to no padding, 0 corresponds to padding 0037 % to the next highest power of 2 etc. 0038 % e.g. For N = 500, if PAD = -1, we do not pad; if PAD = 0, we pad the FFT 0039 % to 512 points, if pad=1, we pad to 1024 points etc. 0040 % Defaults to 0. 0041 % Fs (sampling frequency) - optional. Default 1. 0042 % fpass (frequency band to be used in the calculation in the form 0043 % [fmin fmax])- optional. 0044 % Default all frequencies between 0 and Fs/2 0045 % err (error calculation [1 p] - Theoretical error bars; [2 p] - Jackknife error bars 0046 % [0 p] or 0 - no error bars) - optional. Default 0. 0047 % trialave (average over events when 1, don't average when 0) - 0048 % optional. Default 0 0049 % fscorr (finite size corrections, 0 (don't use finite size corrections) or 0050 % 1 (use finite size corrections) - optional 0051 % (available only for spikes). Defaults 0. 0052 % Output: 0053 % S (triggered spectrum in form frequency x events for trialave=0, 0054 % or as a function of frequency for trialave=1) 0055 % f (frequencies) 0056 % R (spike rate) 0057 % Serr (error bars) - only for err(1)>=1 0058 0059 if nargin < 3; error('Need data, events and window parameters'); end; 0060 if nargin < 2; params=[]; end; 0061 [tapers,pad,Fs,fpass,err,trialave,params]=getparams(params); 0062 clear tapers pad fpass trialave 0063 if nargin < 5 || isempty(fscorr); fscorr=0; end; 0064 if nargout > 3 && err(1)==0; 0065 % Cannot compute errors if err(1)=0. Need to change params and run again. 0066 error('When Serr is desired, err(1) has to be non-zero.'); 0067 end; 0068 data=change_row_to_column(data); 0069 data=createdatamatpb(data,E,Fs,win); 0070 if nargout==4; [S,f,R,Serr]=mtspectrumpb(data,params,fscorr); 0071 else [S,f,R]=mtspectrumpb(data,params,fscorr);end