Size constancy is preserved but afterimages are prolonged in typical individuals with higher degrees of self-reported autistic traits

Deficits in perceptual constancies from early infancy have been proposed to contribute to autism and exacerbate its symptoms (Hellendoorn et al., Frontiers in Psychology 6:1–16, 2015). Here, we examined size constancy in adults from the general population (N = 106) with different levels of self-reported autistic traits using an approach based on negative afterimages. The afterimage strength, as indexed by duration and vividness, was also quantified. In opposition to the Hellendoorn and colleagues’ model, we were unable to demonstrate any kind of relationship between abilities in size constancy and autistic traits. However, our results demonstrated that individuals with higher degrees of autistic traits experienced more persistent afterimages. We discuss possible retinal and post-retinal explanations for prolonged afterimages in people with higher levels of autistic traits

SEMICONDUCTORS OF THE TYPE MeIIMeIVS3

Les composés du type MeIIMeIVS3 (MeII = Sn, Pb ; MeIV = Ge, Sn) se présentent dans deux groupes de symétrie isotypique : MeIISnIVS3 orthorhombique et MeIIGeIVS3 monoclinique. Nous avons préparé des monocristaux suffisamment grands, afin de pouvoir déterminer les propriétés physiques fondamentales de ces composés : conduction électrique, absorption optique auprès du gap électronique fondamental. Les résultats ont été discutés en vue des structures cristallines différentes.Ternary compounds of the type MeIIMeIVS3 with the elements MeII = Sn, Pb and MeIV = Ge, Sn form two isotypic groups, with orthorhombic (MeIISnIVS3) and monoclinic (MeIIGeIVS3) symmetry respectively. Single crystals of sufficiently large size have been prepared to examine some basic physical properties. Results on electrical conductivity, and optical absorption measurements at the fundamental electronic gap are reported. They will be discussed with respect to the crystal structures