A problem with collecting data in experimental procedure.

[Maciek]

        This experimental procedure is designed to measure reaction
time (RT) of naming pictures.
To the experiment we use Dell Inspirion 6400 laptops with 2.00 Ghz
Core Duo processor and 2.00 GB RAM. E-Prime 1.2 (1.2.1.844), E-Studio
(1.2.1.89). SRBox connected to a laptop by the DB9-USB connector.
        In the whole experiment there are 525 trials. There are 5
blocks. Each block consists of 104 trials. Additionally, before the
task starts, subject does training consisting of 5 trials to
familiarize with the task. After each block there is a pause.
In each trial on the screen subject can see: a cross, an empty screen
and a stimulus which is a picture. Subject should name this picture. A
Picture disappears after 3 seconds but there is an additional second
to collect the response in case the subject starts naming a picture
just before its disappearance. The RT is collected by a microphone
voice key in SRBox.
	We have a problem with logging RT. Sometimes procedure collects
response in trials in which there was no subject's response. The
picture disappears from the screen immediately and RT is logged
without any sound. The microphone isn't stimulated by the breath-out
of subject because it is placed on the desk. The same happens even if
we turn off the microphone. This phenomenon happens mostly in about
28th or 30th trial.
	I would be grateful if you could help me with solving this problem.
	I am looking forward to any response.

        Maciek Taraday
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