The truth of flat earth is accepted by ones that have an experience of a fixed plane.
A desire for reason dictates a single "boss," cognitively, for non-schizophrenics. If an incongruity arises there are a few ways to cope.
Sense data from the perceptual field shows a fixed plane of earth. Because that defies expectation people will either:
Refer to Gregory Bateson's work on schizophrenia and Jerome Bruner and Leo Postman's work on incongruity. And refer to "The Earth is flat when personally significant experiences with the sphericity of the Earth are absent" by Claus-Christian Carbon, Cognition 116 (1):130-135 (2010).