rt timing

[jarvis24]

Try rt:any>-n (when n is the number of the next trial, e.g., rt:any>-23 to immediately jump to trial 23) after each image rather than rt:-1. Or you could use a specific keycode if there is one you want to use. e.g., rt:57 to use the spacebar to cancel out.

[scienceisbeauty]

Exactly, so in my experiment what I want is:

Hitting spacebar is correct, hitting nothing is incorrect, but for the spacebar to be correct - it has to be hit within 500 ms of stimulus presentation (pretty much at the time the stimulus is presented).
Similiar to duindain - the next stimulus in the trial only comes up if the participant hits the spacebar key. Doing nothing doesn't advanced the stimulus to the next one within the same trial.

Can someone help? Can you show me exactly what I should type in to the 'time' box? Right now, I have rt: 57,-1 but I don't know how to set 57 for 500 ms.

[duindain]

the first post by jarvis explains how to have the event display for the correct time just set the max setting for minmax to 500 in the style
i think you need
0-500!
in the minmax colomn on the far right when u open the style

thankyou jarvis the >- jumping did what i needed

[scienceisbeauty]

Doing an n-back task.

For where there is no, n-back:If the participant does nothing that is correct, if the participant hits spacebar, that is incorrect.

For where there is an n-back: If the participant hits spacebar that is correct, if the participant hits nothing, that is incorrect.

For both of these, there is a limit of 500 ms to make a decision.
People keep talking about the max min thing. I don't understand. This is all new to me.

Ok, so I need help like this -
Stim ; Loc ;Time ; Stim ;Loc ;Time
~4 0,0,1 rt:57,-1 ~4 0,0,1 rt:57,-1

The above only goes to the next number (within the same trial) when the spacebar is hit. But I'm trying to give it two options, to go to the next number when the spacebar is hit or when nothing is hit for 500 ms.

Similarily if I put rt:-1,57 in the time colum, then it goes immediately to the next number. I'm so so confused.

I know Jarvis24 is such a helpful person. I'm just blah at this. Whenever I have rt:57,-1 it doesn't go on to the next thing unless I press spacebar. I want it to go on even if I don't press it provided I don't press it within 500 ms. However when I do rt:57,-1 it doesn't do anything unless I press spacebar. Isn't ',' supposed to represent OR?

[jarvis24]

Take a look in the samples folder--C:\DirectRT\samples\6 v2006\gnat. That sample might help you with what you are looking for--that is, creating a fixed window with a spacebar/no spacebar situation. You maybe just need to use a min-max value of 0-500 in your situation. The gnat sample is also documented in the user's guide and online here:

http://www.empirisoft.com/directrt/h...e_as_valid.htm

Let me know if that still doesn't help.

[scienceisbeauty]

Take a look in the samples folder--C:\DirectRT\samples\6 v2006\gnat. That sample might help you with what you are looking for--that is, creating a fixed window with a spacebar/no spacebar situation. You maybe just need to use a min-max value of 0-500 in your situation. The gnat sample is also documented in the user's guide and online here:

http://www.empirisoft.com/directrt/h...e_as_valid.htm

Let me know if that still doesn't help.

This helps. I'm not sure I'm doing it correctly tho....hmmmm

[scienceisbeauty]

I'm asking a question using a text file #nameoftextfilethathasquestion, then there are 5 response options. I want the person to choose 1 of those so they should answer with 1,2,3,4, or 5.

Is writing rt:1,2,3,4,5 in the 'time column' the correct way to give them those options, because it doesn't seem to work. Only pressing 1 advances to the next screen.

Yes, that should work, unless you are using the number pad keys which require different codes, I believe.

they are responding to a question that asks what percent did you get on the test.
what do I write after rt: so that participants can respond btwn 0 - 100 ?

as in, they could enter 40, 50, 99 or whatever number they want between 0 - 100 . How do I put this option in?

You can use rt:text for responses that require more than a single character. See open ended responses in the users guide for more detail.