One hypothesis for the occurrence of the Reaver thread is the observed phenomenon of space madness. It appears that, with prolonged exposure to the expansive void of space, the human mind tends to undergo significant strain that eventually leads to antisocial and delusional behavior. Reports of space madness are mostly anecdotal due to the roaming nature of humanity’s survivors. These reports range from changes in demeanor, through the gamut to transformation into a reaver. Unfortunately, due to the massively destructive nature of the reavers, records from pre-reaver scientists has been all but completely wiped out.
Human beings believed to be experiencing the early symptoms of space madness are often referred to as Spooks, and are sometimes subject to hostile discrimination due to the presumed link between space madness and the reaver threat.