1d78c129_attle_Lab___The_Torture_Report__Effects__Purposes__
[General Method] 2. Monopolization of Perception [Variants] Physical Isolation Darkness or Bright Light Barren Environment Restricted Movement Monotonous Food [Effects (Purposes?)] 
Fixes Attention upon Immediate Predicament; Fosters Introspection Eliminates Stimuli Competing with those Controlled by Captor Frustrates all Actions not Consistent with Compliance
Chapter 5, Part 2 - The Battle Lab | The Torture Report
Effects (Purposes?)