  This paper focuses on the emergence of communication to support cooperation
in environments modeled as social deduction games (SDG), that are games where
players communicate freely to deduce each others' hidden intentions. We first
state the problem by giving a general formalization of SDG and a possible
solution framework based on reinforcement learning. Next, we focus on a
specific SDG, known as The Werewolf, and study if and how various forms of
communication influence the outcome of the game. Experimental results show that
introducing a communication signal greatly increases the winning chances of a
class of players. We also study the effect of the signal's length and range on
the overall performance showing a non-linear relationship.
