The Use of Iambic Pentameter in the

columns of circles on the opposing side of each stimulus. For example, in the stimulus
depicted in Figure 13A, the post-constancy color of the central circles is red and matches
that of the columns of circles on the right. Due to the pre- and post-constancy color
interpretations of the central circles, the experimental stimuli presented by Schulz and
Sanocki were ambiguous as to how the central column of circles could be grouped by
color similarity.
Masks followed each stimulus to limit exposure time to 200, 500, 1100, and
2000ms. Participants directly reported the grouping of the central column of circles by
key press. As shown in Figure 13B, Schulz and Sanocki (2003) found that grouping was
primarily based on pre-constancy color when the stimuli were presented for brief
exposure durations (pre-constancy 88%, post-constancy 12% at 200ms). Alternatively,
grouping was primarily based on post-constancy color in the longest stimulus duration
(pre-constancy 18%, post-constancy 82% at 2000ms). In sum, grouping began by one
color and then gradually changed to occur by an alternative color over time.
The finding that pre-constancy color information is more salient in short stimulus
durations has raised some interesting questions. One such question is whether pre-
constancy information can be used to speed grouping responses in unlimited exposure
conditions. Schulz and Sanocki (2003) conducted a second experiment to speak to this
question. Participants were presented with experimental stimuli that were identical to
those presented in Experiment 1 (see Figure 13A). However, stimuli in the second
experiment were presented for unlimited exposure durations 2 and reaction times were
recorded. The difference between pre -and post-constancy color was explained to
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