-Participants interviewed individually & asked to describe what happened during the murder that led to them being committed. Interviews all followed the 'Step-Wise' approach.
-Interviews were typed up as transcripts -> everything prisoners said was typed up (even dysfluencies such as 'um' and 'ah' and ungrammatical uses of language).
Transcripts went through two forms of computer-based analytics :
1. Wmatrix -> program that analysed the whole 'corpus' of all 14 psychopaths transcripts and compared them against the whole 'corpus' of the 38 non-psychopath transcripts .
Analysed the words used, tenses etc.
2. DAL (Dictionary of Affect in Language) -> Applied to each transcript individually -> assesses the pleasantness and intensity of emotional language used.