adjusting time of stimulus presentation by key presses

[Ashtyster]

Hello,

I would like to develop a task in which the default viewing time of
each stimulus could be adjusted by the participants according to their
‘work-effort’, i.e. the frequency of key-pressing of either the ‘up’
or the ‘down’ keys. I would like to have a visual analogue scale
presented together with each stimulus which would provide participants
with a real time indication of the viewing time duration, with a bar
moving downwards over time (the speed of movement could either be
slowed or increased by the key presses).

First of all, is it possible to create such a task with E-Prime. If
yes, could anyone please advise on which objects/functions to tamper
with?

All kinds of input will be very much appreciated!

Cheers,
A.

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