>From desperc@dibit.hsr.it Thu Feb 29 02:46:06 1996
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Date: Thu, 29 Feb 96 00:41:11 -0800
From: de sperati claudio <desperc@dibit.hsr.it>
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Subject: response time
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Dear Sir,
could you kindly post this query on CVNET?
Thank you
Claudio de'Sperati and Natale Stucchi
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We are starting a reaction time experiment. Since it is a two-choiches task, we sought to use two keyboard keys on the computer (rig=
ht and left arrows) together with the on-board computer clock. We know that this kind of measure does not provide a very precise est=
imate of RT, because of the preence of a buffer in the keyboard circuitry which could take about 10-20ms. We have also been told, ho=
wever, that this should not apply to the first keypress, but only to a second keypress when two keys are pressed in sequence. Anyone=
knows wheter this is true? And, in general, what is the accuracy of RT measures using keypresses? Second, apart from the possible p=
oor accuracy in the RT estimates, is there any other serious problem in using the keyboard keys rather than an external two-swithces=
device sampled at high frequency? Provided that it is more elegant using an external device, why people do not employ the keyboard =
keys, which appears to be much simpler? Thank you in advance. Natale Stucchi and Claudio de'Sperati
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