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