The Use of Iambic Pentameter in the

2001), grouping by proximity and alignment chromatic color, achromatic color and shape
similarity (Kurylo, 1997; Schulz, 2001; Schulz, 2002; Schulz et al., 2001; Schulz &
Sanocki, 2003). From these results, we can conclude that spatial scenes can be interpreted
in more than one way, depending on viewing duration. The following will be a discussion
of various lines of empirical evidence that suggest a time course of perceptual
organization. Specific emphasis will be placed on the time course of Gestalt grouping as
it relates to the proposed line of research.
Size perception. In the late 1950s, Gulick and Stake (1957) began by investigating
how viewing durations of spatial scenes can affect size perception. Participants observed
two triangles that were presented in a 130-foot tunnel. One of the triangles remained in a
constant depth location on each trial. The second triangle was adjusted in depth, from 20
to 80 feet, on each trial. Due to the fact that the second triangle was presented at a variety
of depth locations, the retinal image of this triangle varied across trials. Although the size
of this triangle remained constant, participants were informed that the size of the second
triangle would vary. The participants then signaled the experimenter when the two
triangles appeared to be the same size. Participants viewed each scene for 0.1 sec, 0.8 sec,
or 4.0 sec. An episcotister was the device used to limit exposure to each scene. The
experimenters hypothesized that shorter exposure times to the objects in the tunnel may
alter the perception of size-constancy when accommodation, convergence, and retinal
disparity were the only depth cues available.
Gulick and Stake (1957) found that participants who saw the perceptual scene for
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