anxiety, or anger; a disturbed sleep pattern (e.g., daytime sleeping and nighttime activity);
and a lack of interest in eating or food refu sal. Depersonalization, derealization, and so-
matic concerns may occur and sometimes reac h delusional proportions. Anxiety and pho-
bias are common. Cognitive deficits in schi zophrenia are common and are strongly linked
to vocational and functional impairments. Thes e deficits can include decrements in declar-
ative memory, working memory, language function, and other executive functions, as well
as slower processing speed. Ab normalities in sensory processing and inhibitory capacity,
as well as reductions in attention, are also  found. Some individuals with schizophrenia
show social cognition deficits, including deficits in the ability to infer the intentions of
other people (theory of mind), and may attend  to and then interpret irrelevant events or
stimuli as meaningful, perhaps leading to th e generation of explanatory delusions. These
impairments frequently persist during symptomatic remission.
Some individuals with psychosis may lack insi ght or awareness of their disorder (i.e.,
anosognosia). This lack of “insight” includes  unawareness of symptoms of schizophrenia
and may be present throughout the entire cour se of the illness. Unawareness of illness is
typically a symptom of schizophrenia itself rath er than a coping strategy. It is comparable
to the lack of awareness of neurological  deficits following brain damage, termed anoso-
gnosia.  This symptom is the most common predicto r of non-adherence to treatment, and it
predicts higher relapse rates, increased numb er of involuntary trea tments, poorer psycho-
social functioning, aggression, and a poorer course of illness. 
Hostility and aggression can be associated  with schizophrenia, although spontaneous