Performance of Möbius participants on lower-level vision and object processing tests in comparison to controls.

‘Higher IQ’ refers to Möbius participants and aged-matched controls with IQs within the higher range; ‘Older Low-IQ’ refers to the control group matched to MB2 according to age, IQ and gender; and ‘Younger Low-IQ’ refers to the control group matched to MB5 on the same measures. ‘BORB’ refers to the Birmingham Object Recognition Battery [49]; and ‘CCMT’ to the Cambridge Car Memory Test [52].*Represents impaired performance.