In What Ways does prison solitary confinement influence aggression among inmates?

This research proposal is about, Prison Solitary Confinement and it’s Emotional Effects. Specifically, the research question should be, In What Ways does prison solitary confinement influence aggression among inmates? The research hypothesis is,There is a positive correlation between prison solitary confinement and aggression among inmates. The research proposal should include the background, what information is known about this topic in literature? MORE importantly what are the gaps ? What is UNKNOWN ABOUT THIS TOPIC? Also, how do the gaps relate to current study? This paper should also include the methods, set design validity, specifically the threats to internal validity and external validity.