Millisecond Forums » Millisecond Forums » Inquisit 3 » Reponse - dead man's switch

Reponse - dead man's switch

mrg4 — Tue, 05 Jan 2016 05:19:24 GMT

Hi,

for an experiment we want to use a different form of response than usual. We want the participant to press a key in order to start a video sequence and that he keeps pressing the key throughout the clip. Whenever a critial situation occurs he should lift his finger. This procedure is quite similar to a "dead man's switch".

I found no solution to this approch, so I hope you can help us.

Thanks,
Dominik

RE: Reponse - dead man's switch

Dave — Tue, 05 Jan 2016 05:19:24 GMT

If you are using Inquisit 3 (which I assume, because you posted in the Inquisit 3 forum), this is not possible: Inquisit 3 does not have the capability to register key releases.

Inquisit 4, on the other hand, does have that capability. To define a key release as response, you prepend a minus-sign to the respective key's scan code.

<trial mytrial>
...
/ validresponse = (-57)
...
</trial>

would consider the release of the space bar a valid response.