[FieldTrip] Sample script for spike+LFP analysis?
jhegde at gru.edu
Tue Jan 21 10:20:18 CET 2014
Thank you very much. But I'm afraid this doesn't solve my problem. My
problem is not that I don't understand the nature of the trl matrix
(which is easy enough to surmise by looking at ft_definetrial.m).
Rather, it is understanding how the whole script is supposed to work --
which is why I was looking for a working script. (I haven't been able to
find one in http://fieldtrip.fcdonders.nl/example.) So in this case, one
script would be worth a thousand words for me.
Which is why I'd like to respectfully ask again: does anyone have a
working script (plus a datafile, if the script does something other than
spike-LFP analysis) that they can share?
On 1/21/2014 3:30 AM, Eelke Spaak wrote:
> Hi Jay,
> A "trl" matrix is an Nx3 matrix that gives, for each of N trials, the
> begin and end sample, and the 'offset' (shift in time axis to
> determine t=0; offset=0 means begin sample will be t=0).
> In typical cognitive experiments, such a matrix is generated by a call
> to ft_definetrial, which in turn calls either a user-specified
> "trialfun" to find events of interest in the data (recorded in a
> trigger channel), or ft_trialfun_general. ft_trialfun_general is a
> simple trialfun that looks for specified event values in a specified
> trigger channel, and creates trials spanning from X seconds before the
> event to Y seconds after the event. For using ft_definetrial, see this
> tutorial: http://fieldtrip.fcdonders.nl/tutorial/preprocessing
> If for any reason (e.g. you don't have triggers) you don't want to use
> ft_definetrial, you can simply create a trl matrix yourself by
> specifying the sample indices and offset.
> On 21 January 2014 02:30, Jay Hegdé <jhegde at gru.edu> wrote:
>> Hi Everyone,
>> I'd like to use FieldTrip for the joint analysis of spike and local field
>> potential (LFP) data. I'm proficient in Matlab, but very new to FieldTrip.
>> I'm trying to write a script by precisely following the relevant tutorial
>> (http://fieldtrip.fcdonders.nl/tutorial/spikefield). Everything goes OK for
>> the first couple of steps, but I'm getting stuck when it comes to
>> constructing "a cfg.trl matrix to preprocess the LFP data" described in the
>> So can anyone share an example script that actually runs and does this
>> analysis, so I can see what the tutorial is talking about?
>> Thank you very much in advance,
>> Jay Hegdé
>> Medical College of Georgia
>> Georgia Regents University
>> Augusta, GA, USA
>> fieldtrip mailing list
>> fieldtrip at donders.ru.nl
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
More information about the fieldtrip