Symmetrical patterns present a variety of perceptual problems (Wagemans, 1995), several of which indicate that the two enantiomorphs forming such figures are interdependent.
H2: That boys, more often than girls, will identify facsimiles rather than enantiomorphs as representing lamellae.
Projections created by reflecting the facsimile projections in a vertical plane normal to the fronto-parallel plane are called enantiomorphs. These relationships are illustrated in Figure 1.
This superiority of boys was not, however, found on the measure involving discrimination between facsimile and enantiomorphic responses; the second hypothesis that boys will, more often than girls, identify facsimiles rather than enantiomorphs as representing the lamellae is therefore not supported by the results.
After presentation of the last lamella the participant was presented with a set of 60 cards, 15 of which bore depictions of the stimulus pentagons as they would appear in the fronto-parallel plane, 15 of which bore enantiomorphs of these depictions, and 30 of which portrayed pentagons unrelated to the pentagons used as stimuli.
Thus three scores were obtained in response to the facsimile depictions and three to their enantiomorphs. Table 1 presents the mean group scores obtained.
It incorporates an assumption that the confusability of enantiomorphs indicates that enantiomorphs are used to encode the orientation of planes of stimuli with respect to the fronto-parallel plane.
On each sheet a model was portrayed twice by a symmetrical arrangement of its enantiomorphs. Two arrangements of the enantiomorphs which are referred to as 'bd' and 'db' and which differed in positioning of the axis of symmetry were used for construction of the response stimuli (see Fig.