Thread Tools  
melanietakarangi
Junior Member
 
Join Date: Jan 2014
melanietakarangi is on a distinguished road Posts: 6
Present multiple probes during an event, Posted January 30th, 2017 #1
Hi there,

I want to present a blank screen for 5 minutes, during which the participant's response is recorded (no problem here). But then I need 10 different "probes" to pop up DURING this 5 minute event. This will consist of some text, asking a question which the participant needs to answer. Following the probe and the participant's response, I need it to go back to the blank screen. Each of the probes need to appear a certain time after the beginning of the block.

I tried to do this using multiple events, with alternating "blank screen" and "probe" events, but I am having trouble with the timing, as I can only get the event to appear for a certain period of time or following a response from a participant, I cannot seem to get the block timing to interrupt the event at the end of 5 minutes.

Does anyone know if this is possible and how I could go about it?

TIA
Reply With Quote
Arman
Support
 
Join Date: Jun 2016
Arman is on a distinguished road Posts: 171
Posted January 31st, 2017 #2
I have attached an experiment to this post.

Probes are presented through trial rules. The block loops and the Blank event ends immediately; this allows trial rules to be assessed very often which means we can keep track of time very often.
Attached Files
File Type: sl5 probes.sl5 (4.3 KB, 3 views)
Reply With Quote
melanietakarangi
Junior Member
 
Join Date: Jan 2014
melanietakarangi is on a distinguished road Posts: 6
Posted February 19th, 2017 #3
This is great, however is there some way to time the probes from the start of the block instead of the start of experiment? The option is there but it does not seem to work.
Reply With Quote
Arman
Support
 
Join Date: Jun 2016
Arman is on a distinguished road Posts: 171
Posted February 20th, 2017 #4
Yes; see in the attached experiment that I've added a timer parameter which the trial rules now respond to. The timer should be started just before the block is presented, i.e. at the end of the preceding block.
Attached Files
File Type: sl5 probes.sl5 (5.4 KB, 1 views)
Reply With Quote
Tags
blank screen, block timing, event timing, probes
Thread Tools
Posting Rules
Forum Jump:
Copyright Cedrus Corporation, 1991-2014.
All times are GMT -7. The time now is 12:28 AM.