aligning events to continous data (OE format using load_open_ephys_data_faster.m)

[Edgar Bermudez]

Hi all,

Due to my previous failed attempts to align events to continuous data using the kwik format due to some bug (see this thread in you have similar problems), I decided to record and test the OE format. According to the documentation,
when use load_open_ephys_data_faster.m (from the analysis-tools), the time stamps of the events should align to the time stamps of the .continous data. However, when I do:

% load continuous
[data, ts, info] = load_open_ephys_data_faster('109_CH9.continuous');
% load events
[data_e, ts_e, info_e] = load_open_ephys_data_faster('all_channels.events');
% plot
figure(); hold on;
plot(ts, data);
plot(ts_e, data_e, '.');

Things don't match. Any ideas what is wrong? Are ts actually records instead of timestamps like in ts_e?

Many thanks again,
Edgar

[Josh Siegle]

In what way don’t the timestamps match? Does dividing ts by the sample rate solve the problem?

Josh

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[Edgar Bermudez]

Yes, I am sorry for making such a stupid question....

For reference:

[data, ts, info] = load_open_ephys_data_faster('109_CH9.continuous');

ts = ts/info.header.sampleRate;

[Josh Siegle]

It’s not stupid. We should really decide on a standard for loading timestamp values (always in sample number, or always in seconds) so it doesn’t lead to confusion.

To view this discussion on the web visit https://groups.google.com/d/msgid/open-ephys/d8437c17-b41e-4477-a810-41b03ae05f8e%40googlegroups.com.

[Nivaldo Vasconcelos]

Hi,

I've had confuse trying to align the event times with a dat file, read by using the neuroscope, in which the event's times must be informed by the number of milliseconds since the first sample.

How can I convert the timestamps to seconds ? Or are they already in seconds (since the beginning of the recording) ?

Thanks in advance,

Nivaldo