frequency of cursor position recording

[Ashtyster]

Hi Paul,

thank you for your reply.

So if I understand you correctly, I should just calculate temporal
resolution from the output, and adjust the sleep value according to
the temporal resolution I'd like to have?

All best,
A.

On Mar 25, 11:54 pm, Paul Groot <pfc.gr... at gmail.com> wrote:
> Hi Ashtyster,
>
> The sleep instruction simple puts the running script in 'idle'mode for
> the specified number of milliseconds. Windows can use this time to
> allow other processes to consume some CPU time. This construction is
> often used in loops to prevent the system to become stalled. A
> duration of about 20 milliseconds might be sensible on systems that
> are connected to a display at 50Hz. The value could even slightly less
> on systems with a typical refresh rate of 70-80Hz. However, windows
> will probably update the mouse cursor position completely independend
> of the refresh cycle, so the temporal resolution might be very
> different...
>
> Also, the DoEvent function is probably a leftover from the standard
> basic language. It is used to allow other applications to handle the
> message queue. I would normally not include this call in eprime
> experiments.
>
> best,
> Paul
>
> 2011/3/25 Ashtyster <ashtys... at gmail.com>:
>
>
>
>
>
>
>
> > Hi!
>
> > I've gotten a bit confused trying to understand how to set the
> > frequency of cursor position recording in E-Prime.
>
> > I am presenting images and recording mouse cursor positions while
> > subjects view the images. I would like to set the "sampling rate" for
> > the cursor position recording to 50 Hz. The in-line script has the
> > following sampling rate preset:
>
> > 'Give some time back (required) - i.e. sampling rate.
> > Sleep 20
> > DoEvents
>
> > What I am confused about is what does this '20' value mean? Does it
> > mean 20 cycles per second?
>
> > I would appreciate if somebody could answer this question.
>
> > All best,
> > Ashtyster
>
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