Table 1 Summary of all pre-registered (https://osf.io/caqfk) hypotheses

1

Japanese non-autistic individuals will show difficulties in interpreting animations created by Japanese autistic participants to an extent comparable to the performance of British non-autistic participants when interpreting animations made by British autistic participants

Edey et al. [26]

2

Replicating a previous study [26], British non-autistic participants will show poorer performance when interpreting animations created by British autistic participants

Edey et al. [26]

3

There will be no differences in performance between the two autistic groups when rating animations created by autistic participants of their own, relative to the respective other culture

Chevallier et al. [68],

Izuma et al. [69],

Large et al. [70]

4

UK autistic participants will show no 'own group bias' when rating animations of other UK autistic people, as was found in Edey et al. [26], and will thus show comparable performance when rating animations created by UK autistic and non-autistic individuals

Edey et al. [26]

5

The more similar a British observer's own movement kinematics are to the movement kinematics of a given animation, the better they will be at accurately labelling it, regardless of whether they have an ASD diagnosis or not

De Marco et al. [32], Schuster et al. [33], Schuster et al. [34]

6

Animations created by autistic participants of both cultures will exhibit higher mean jerk than animations created by Japanese or British non-autistic participants

Edey et al. [26],

Cook et al. [36],

Yang et al. [35]

7

Movement kinematics will play a lesser role in the communication of mental states among Japanese people, and therefore the effect of movement differences on mental state attribution accuracy will be less strong in this culture compared to British participants

Lillard [52],

Heyes and Frith [53],

Matsumoto et al. [54]