In the circumstances of facsimile and enantiomorph responses being equally frequent, the ratio has the value of 0.5.
(2000) point out that the difficulties in discriminating between mutually enantiomorphic patterns show that the perceptual encodement of a pattern must necessarily involve encodement of its enantiomorph; a discrimination error occurs whenever an observer responds to the enantiomorph as if it were the facsimile of the original pattern.
In the present task embedding is achieved, in spite of the clear delineation of the figure, by means of the fact that the figure together with its enantiomorph forms a symmetrical pattern.
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.
The results clearly show that orientation of the stimulus affects the relative strength of the encoded enantiomorphs. For the stimuli in the fronto-parallel plane both manners of encodement ('bd' and 'db') yield clearly related scores.
Thus, it was put forward that a lamella of shape 'b' is encoded by two enantiomorphs, 'b' and 'd', which are arranged in either 'bd' or 'db' manner depending on whether the 'belly' of the lamella or its 'stem' is closer to the viewer.
The facsimile fosters correct recognition of the stimulus; the derivative element fosters the erroneous response of mistaking the stimulus's enantiomorph for the stimulus.
That participants will perceive the facsimile of a stimulus lamella as more similar to the lamella than they would the enantiomorph of this facsimile.