I am trying to write a program that will use white noises that participants will or not be able to stop. In the meantime, I will be recording heart rate and skin conductance. We use AD Instruments in our lab. I'd like to have a mark written on the AD instrument output for every time a noise is started and then when it stops (whether the person stops it or it stops on its own due to timeout).
I've read the help about how to present TTL signals, how to use the control monitor tool, about the port element, subport and items attribute and downloaded the Oddball Auditory Task from the task library and searched through the forum and it is starting to be a bit clearer to me.
I am still very unsure about one thing though.
How do you determine the sequence to write in the item attribute and the subport attribute (between control and data)? For example, in the oddball task, the item attribute is "00000001" for oddball "00000010" for baseline and "00000011" for response.I thought it was just that for each new signal you want, you increased the binary sequence.
But reading through the forum, the items are sometimes defined by more random sequences so I'm quite lost.
I am also quite confused about the difference between control and data for the subport.
Do I need to plug the AD instrument and use the monitor control tool? Or is there a way to determine this without doing that?
Thanks a lot.