5 Attachment(s)
Probe Task Samples and Documentation (case 1590)
The following samples demonstrate how to execute a secondary task or probe task while a subject completes another task in MediaLab. Visual, auditory and TTL signal probes can be launched at any time from your questionnaire. You can create a schedule of probes at either random or fixed intervals and get subjects' response times to the probes. The probes can span multiple items as the probe function runs independently of the experiment once launched. Response times are assessed using DirectX so their accuracy is very good.
"last probe still running" error message
I was able to get this close to functional pretty quickly but it is not recording every response to the probe items. Instead, I get a data file with the responses for about half of the items and a "read me" text file saying things like "Can't run probe set 4 because last probe set is still running". It doesn't seem connected to the number of trials I have in between probe sets. Some of the probe sets work fine on back to back trials while others, with several trials in between, give me that error message.
Any ideas?
Probes Function Data Problems
We're running an experiment in which people are reading stories and responding to a auditory probe. The probes are working just fine but all of our data in the resulting probes.sav file shows up as -1 for the var_t, var_k, and var_r variables. We've tried different probe parameters with no success. Any advice is appreciated.
voice response to STRT probes?
Hello, I want to know if I can combine MediaLab's voice response feature with STRT reaction input? In the keycodes document there are only keyboard inputs, but I would like to have the participants give vocal responses to the audio probes during video watching and record their RTs. Has anyone done anything like this before? If the current Medialab version doesn't support it, what would you suggest as the next best option for me to do? Thank you very much!