Another theoretical account which might fall under the broad heading of integration and complexity is the interest-based theory, monotropism (Murray et al., 2005). This theory, developed by autistic academics, posits that the defining feature of autism is atypical allocation of attention. The difference between autistic and non-autistic people is characterised as follows: “It is the difference between having few interests highly aroused, the monotropic tendency, and having many interests less highly aroused, the polytropic tendency” (ibid., p. 140). Consequently, this model places causal primacy on the intense focus apparent in the diagnostic domain of RRBIs, with other diagnostic features following from this underlying difference. To the extent that social interaction requires diffuse and distributed attention, autistic people are not well suited to that activity. Monotropic theory, which awaits empirical testing, provides a vivid description of the autistic experience of novelty and change, giving a valuable insight into the autistic experience of a crisis, or “meltdown”:
To a person in an attention tunnel every unanticipated change is abrupt and is truly, if briefly, catastrophic: a complete disconnection from a previous safe state, a plunge into a meaningless blizzard of sensations, a frightening experience which may occur many times in a single day. (Ibid., p. 147)
Monotropic attention would lead to the development of specialised skills but also difficultly dealing with change.
The only theory I’m aware of that seems to make a decent stab at explaining the many seemingly disparate features of autistic psychology – from inertia to communication problems to hyperfocus and spiky profiles – is monotropism. However, this theory (formulated by autistics who aren’t professional psychologists) has received relatively little attention from psychologists and awaits direct empirical verification.