Positive
Symptoms -
reflect an excess
or distortion of
normal
functions
Delusions
Bizarre
beliefs that
seem real,
but aren't.
Can be
paranoid (i.e.
fearful of
persecution)
in nature
May also
involve
inflated
beliefs about
the person's
power and
importance
Of reference involve
the belief that the
behaviour or
comments of others
(even on TV) are
meant for them alone
Experiences of control
Belief that they
are under the
control of, for
example, an alien
force that has
invaded their mind
and/or body.
Hallucinations
Bizarre, unreal
perceptions of the
environment that are
usually auditory
(hearing voices) but
may also be visual
(seeing lights, objects
or faces), olfactory or
tactile
Disordered thinking
The feeling that
thoughts have been
inserted/withdrawn
from the mind
In some cases the
person may
believe their own
thoughts are
being broadcast
so that others can
hear them.
Tangential,
incoherent or loosely
associated speech is
used as an indicator of
thought disorder.
Negative Symptoms
Reflect a
diminution or loss
of normal
functions, which
often persist
during periods of
low (or absent)
positive
symptoms.
Affective flattening
Reduction in the range and intensity of emotion expression,
including facial expression, voice tone, eye contact, and
body language.
Alogia
Poverty of
speech
(lessening of
speech fluency
and
productivity)
Reflect slowing or blocked thoughts
Avolition
Reduction of/inability to
initiate and persist in
goal-directed behaviour.
Often mistaken for
apparent disinterest.
Under
DSM-IV-TR,
diagnosis
requires at least a
1 month duration
of 2 or more
positive
symptoms.
The Nature of Schizophrenia
Is not 'split
personality' nor
'multiple
personality'
Sufferers aren't
perpetually
incoherent nor do
they constantly
display psychotic
behaviour
Is characterised by a
profound disruption of
cognition and emotion
affects language, thought, perception, affect, and even
sense of self
Violence
association with violent behaviour
largely due to media representations
e.g. in 2007 newspapers
carried the sad story of
psychology graduate
Ashleigh Ewing who was
brutally murdered by
Ronald Dixon, a
schizophrenic 'with a
history of violence'.
Content analysis of US TV by Deifenbach (1997)
found that mentally ill people were 10x as likely
to be represented as violent compared to the
general population of TV characters
In any one year, approx. 8% of schizophrenic patients will commit a serious act of violence,
more than the population who don't have a mental disorder, but less than those with other
mental disorders (i.e. depression and personality disorders).