Although Nash could fall under the disorganized subtype of
schizophrenia, he could also be diagnosed with paranoid schizophrenia.
Paranoid schizophrenia, unlike disorganized schizophrenia, rarely
relates to difficulties concentrating and thinking: It is clear that
Nash is still very capable of high levels of focus. His thoughts, if
not always his words, are coherent and he displays rational though
often socially unacceptable behavior, observable in his interaction
with the woman he approaches at the bar. We discover later that Nash
suffers from complex hallucinations, such as the agent who approaches
him, expanding to a soviet scheme and an organization that requires
him to sort through magazines and newspapers for codes that would lead
him to a soviet plot, and the implantation of a tracking device in his
forearm. This hallucination is particularly egocentric in nature, (the
concept of being singled out by an individual or group with a scheme
centered around oneself) and very characteristic of paranoid type