The present study investigates configural processing by contrasting the perception of known and unknown faces in upright and inverted orientation in congenitally prosopagnosic and control participants.
Their analysis favors the inverted orientation as the likely great ape and human ancestral state (23).
Based on physiologic and observational studies, most surgeons use 3 parallel cancellous screws in a triangular (typically inverted) orientation [ 12, 20].
In some of these studies, fibre-FISH images have shown structures with as many as 12 AMY1 repeats in both tandem and inverted orientation (2, 11).
In contrast, comparative primate analyses suggest that the H2 (or inverted) orientation represents the ancestral state for the 8p23 and 17q21.31 loci.
We are not aware of an inverted orientation of the periodic table being used previously as a teaching aid.
This enabled us to test whether the traditional upright or inverted orientation (1) was more liked, (2) appeared more symmetrical and (3) influenced where people tended to look.
Overall, we found that participants had a modest preference for the traditional orientation over the inverted orientation (4.2 points on a 0 100 scale, p = 0.030).
People also like abstract symmetry9 but this cannot explain the modest preference for the conventional orientation, because the same participants rated the inverted orientation as slightly more symmetrical.
However, their eyes were drawn upwards by the traditional orientation, whereas in the inverted orientation, their eyes were drawn downwards, albeit to a lesser extent (Fig. 2).
We show that HSDs are non-randomly organized, associate preferentially with ancestral ape duplications termed 'core duplicons' and evolved primarily in an interspersed inverted orientation.
