[Eeglablist] event import

[Guillaume Lio]

Biosemi systems code the triggers on 2 groups of 8 bits.
Some devices use only the first group of 8 bits :

So if your trigger baseline is :

0           =                     0000 000

Your baseline will be in reality  :

65280  = 1111 1111 0000 0000

because inputs that will be not used will deliver a signal = 1 in 
biosemi systems.


Consequently :

65402 =  1111 1111 0111 1010
->                                 0111 1010
-> = 122

65403 =  1111 1111 0111 1011
->                                 0111 1011
-> = 123

and not 124 and 125

124      =                       111  1100
->             1111 1111 0111 1100
-> = 65404

125      =                       111  1101
->             1111 1111 0111 1101
-> = 65405

But I don't know the meaning of the 122 and 123 triggers in your protocol.

I hope this whill help,

Guillaume.



Le 27/06/2012 22:09, Clemens Brunner a écrit :
> OK, here's what I found so far.
>
> Importing the .bdf file can be done either with the BDF plugin or the
> BIOSIG plugin. I tried both, and they both yield event types 65402 and
> 65403. In addition, there are also 65280 events. The BDF plugin produces
> lots of these 65280 events, whereas the BIOSIG plugin produces only one
> at the beginning.
>
> Can you please check which import plugin works correctly for your data?
> If the number and latencies of the events match with your original
> events, then I think you can ignore the type change and just work with
> 65402 and 65403 events.
>
> Concerning the .cnt file, which import plugin did you use? I tried the
> BIOSIG plugin, and it seemed to work. All events are at different
> latencies (there are 360 events). However, I had to create
> read_eep_cnt.mex from source (http://sourceforge.net/projects/libeep/).
>
> Clemens
>
>
>
>
> On 06/27/2012 11:55 AM, Inga GB wrote:
>> Hi Clemens,
>> I have sent you invintation to the dropbo folder with the sample
>> data-please let me know if it works.
>> Many thanks,
>>
>> Inga
>>
>> On 27 June 2012 21:23, Clemens Brunner <clbrunner at ucsd.edu> wrote:
>>> Hi Inga,
>>>
>>> could you send me example .bdf and .cnt files please?
>>>
>>> Thanks,
>>> Clemens
>>>
>>>
>>>
>>>
>>> On 06/27/2012 03:30 AM, Inga GB wrote:
>>>> Dear all, I am a relatively new to EEGLAB.
>>>> And Ihave two concerns about event-featuring in EEGLAB v 11.0.0.0b.
>>>> I have two file-formats:
>>>>
>>>> .bdf files in biosemi-events can be export, however, the names of
>>>> events are changed. fe I have 2 event types called 124 and 125, and
>>>> after importing data these are changed to 65402 and 65403...what can
>>>> be the problem?
>>>>
>>>> .cnt from ANT and importing event info from .trg file-this is a total
>>>> mess, as ALL the events (marking stimuli, reaction times, response
>>>> correctnes and so on) are stucked into a single time-point...simply
>>>> speaking, all the events are marked on the first second of my
>>>> 30minutes recordig.
>>>> Is that mine bug...or?...Could you please help me to solve these
>>>> questions?
>>>>
>>>> Many thanks!
>>>>
>>>> Inga
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