Abstract
Selective attention was investigated using a reaction time technique by presenting the subject with two signals separated by a variable time interval. One of the signals, the ‘data’ signal could take one of two values along each of two dimensions, colour and number. The other signal, the ‘cue’ signal indicated which of these dimensions was relevant for the subjects response. Two different conditions were examined. In the first the cue signal preceded the data signal by a variable interval; in the second the cue signal followed the data signal at a variable interval. By recording reaction times for a correct classification on a set of keys, it was shown that results for the first condition were consistent with sequential processing of the cue signal followed by the data signal. In the second condition a further source of intermittency appeared and this seemed to be due to the central systems becoming blocked by irrelevant information from the data signal.
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