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. 2020 Jun 29;375(1805):20190439. doi: 10.1098/rstb.2019.0439

Figure 1.

Figure 1.

Some types of behaviour often called ‘rituals’ (horizontal boxes) and possible presence of specific psychological mechanisms (vertical boxes). In our view, only these systems are scientific objects—so that there can be a coherent theory of signalling, coordination, magical beliefs and ritualized behaviour, but no coherent theory of ‘rituals’.