Some people with schizophrenia are easily distracted and have difficulty remaining vigilant. Latent inhibition (LI) is a measure of selective attention in which the non-contingent presentation of a stimulus attenuates its ability to enter into subsequent associations. This latent inhibition occurs because following repeated nonconsequen-tial presentations of a stimulus, one normally learns to ignore the stimulus, making it harder to then pair it with another stimulus. This measure of selective attention is disrupted in patients with schizophrenia (Gray, 1998). In addition to selective attention, immediate and sustained attention skills are also impaired. Thus, patients with schizophrenia also perform poorly on measures of sustained attention, such as the Continuous Performance Test.
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