Frith distinguishes between conscious and preconscious processing.
Conscious processing is where the highest level of cognitive functioning takes place, we are aware of this level. This has a limited capacity so we can only carry out one task at a time.
The preconscious processing takes place without our awareness, this an automatic process and we can carry out many tasks at any one time
Usually only important information arrives into conscious awareness, in schizophrenics, Frith proposes that the attentional filter breaks down and the unimportant information also gets in the conscious so it is seen as something important which needs to be acted upon.
Frith believes that it is how delusions happen
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