Adding a countdown timer to the screen

[osgoodp...@gmail.com]

Hi everyone,

I have a couple of questions regarding elements I would like to add to my experiment. Any advice would be great,y appreciated, thank you in advance!

1. How can I add a countdown timer to my experiment? I want participants to answer as many questions as they can in a limited amount of time and for the remaining time to be displayed in a countdown timer in on the screen.

2. How can I force my experiment to stop when the time limit described above has expired?

Thank you!

Best,
Jeff

[Josh de Leeuw]

Hi,

I just happened to have recently created an experiment that does something very similar. Here's a link to the experiment code:

https://github.com/vassar-cogscilab/eeg-sequence-pilot/blob/master/index.html

Or, the live version, here:

http://jdeleeuw.vassarcis.net/sl_size/

The key technical points:

1) We use the option to specify a display_element in jsPsych.init to embed the jsPsych content in a div element and then create the timer element outside of jsPsych's domain.

2) We use a call-function plugin trial to display the timer when appropriate.

3) We use a timeline with a loop function to continue the trials until the timer expires. This requires using functions as parameters for the parts of the trial that change, so that we can have a single trial that repeats while the timer is running.

Hope that helps. Feel free to follow up with any questions.

Josh

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