Two pairs of enantiomorphic lamellae in the form of random hexagons served as the main experimental stimuli.
Further, the difference in ease of learning to discriminate between enantiomorphic stimuli suggests that the facsimile encodements of the lamellae set at an angle to the fronto-parallel plane are relatively 'weaker' than those of the lamellae in the fronto-parallel plane.
The means for the three categories of response were: facsimile representations = 10.1; enantiomorphic representations = 8.5; control figures = 4.5.
Scores obtained with facsimile response stimuli should be higher than those obtained with enantiomorphic response stimuli.
The difference between the 'facsimile' and 'enantiomorphic' scores obtained in response to three Orientations of the initial stimuli will differ.
Analysis of variance yielded a highly significant difference between responses evoked by facsimile response stimuli and the enantiomorphic stimuli (F(1,23) = 17.2, p [less than] .0004).
The literature available does not enable one to define the perceptual functions of the two postulated enantiomorphic elements of the encodement, the facsimile and its derivative.
It is postulated that the mechanism in question encodes the orientation of the planes containing the lamellae principally by means of a difference in the cogency of their enantiomorphic images, and that these very images hinder the process of shape discrimination.
The experiments endeavoured to investigate the tentative suggestion that a lamella's spatial orientation is fully encoded by two enantiomorphic 'images' of the lamella and their mutual relationship, notably their arrangement about their axis of symmetry.