Hi seniorc, wanted to clarify your requirement here as I'm slightly confused by the wording...
Are you simply trying to increment (i.e. count) the number of times a key is pressed when a given image is displayed for a set amount of time? For example, an image is set to display for 10 seconds and for the duration of that 10 seconds, you want to count the number of times the respondent presses a key and capture that as a value in the survey?
Alternatively, are you wanting (for example) to display an image for 10 seconds and reset that 10 second countdown every time the respondent presses a key?
Or are you trying to achieve something completely different to either of the above scenarios?
Cheers,
Cameron

Hi Cameron
Thanks for your response - both really. So an image would have a count down bar that descends from 10 to 0 secs. After 10 secs it would disappear. If a user pressed a key the count down would be increased by 1 sec or so. Each time a key is pressed the count would be increased by 1 sec. The number of key presses would be collected plus also the total duration time. This would mean that a particular image could be the screen for 40 secs (for example) and have 20 key presses. While a second image could be on the screen for 10 secs and have no key presses.
I hope this is clearer?
Many thanks for your help here
carl