Nougier V, Rossi B, Bard C, Fluery M, Teasdale N, Cole J, Lamarre Y
UFRAPS, E.A. D.R.E.D. 597, Université Joseph Fourier, Grenoble, France.
Neuropsychologia. 1994 Sep;32(9):1079-88. doi: 10.1016/0028-3932(94)90154-6.
Visual attentional processes were compared in two deafferented patients and 11 normal subjects. Two consecutive stimuli were presented in rapid succession in one of two locations. A peripheral cue first oriented attention to one location where a response was requested. After 100 msec, a second response was required at either the same or opposite location (valid vs invalid cue). Four probabilities of valid cue occurrence were presented: 100, 80, 50 and 20%. Results showed (1) faster reaction times for the second response on cued than on uncued signals; (2) greater attentional effects with increased cue probability; (3) smaller attentional effects in patients. These findings suggest that the patients adopted a cost-minimizing strategy.
