[Eeglablist] Trigger manipulation

[Makoto Miyakoshi]

Dear Connor,

Try something like this

allEvents      = {EEG.events.type}'; % Obtain all event types
testIdx          = find(strcmp(allEvents, 'test')): % Obtain their indices
in event structure
testLatency = cell2mat({EEG.event(testIdx).latency}); % Obtain their latency

Based on the latency obtained, you add some value and put it back to
EEG.event structure using either deal() or loop function.

Makoto


On Fri, Aug 12, 2016 at 6:07 AM, Haggarty, Connor <
C.J.Haggarty at 2014.ljmu.ac.uk> wrote:

> Hi,
>
>
>
> I have a question about changing trigger codes for epochs.
>
> I am completing a study with somatosensory stimuli.
>
> One trigger is sent by E-Prime which codes the speed of stroking touch
> (delivered by the experimenter), sometime after this a trigger is sent from
> a laser showing the exact point at which the experimenter first touches the
> participant.
>
> The laser is the precise onset of touch however, this code is the same
> each time. In order to epoch and bin these data properly I need a way to
> code the laser trigger so that it is an addition (or some calculation) of
> the previous (stimulus type) trigger and the precise stimulus laser onset
> trigger.
>
> Is there some function in EEGLab or some coding that will allow me to do
> this?
>
>
>
> Thank you
>
>
>
> Connor
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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