The Use of Iambic Pentameter in the

short stimulus durations can be used to predict the relative speed of response times based
on that type of grouping.
It is important to note that Schulz and Sanocki (2003) asked participants to
explicitly report the grouping of color stimuli. In these conditions, it is hard to evaluate
the extent to which direct reports assess what participants are really seeing, as opposed to
what they think they should be seeing. In addition, participants in these experiments were
required to choose either the pre-or post constancy match of the central column of circles,
with no way to indicate if they wished to choose both.
To speak to this issue, priming was used to determine whether color similarity
grouping operated differentially on pre- and post-constancy information as a function of
prime duration (Schulz, 2002; Schulz et al., 2001). Priming was chosen as a more
indirect measure. Participants were presented with ambiguous prime displays, which
were identical to the experimental stimuli used by Schulz and Sanocki (2003) (Figure
13A). Participants did not respond to the primes. A mask was used to limit prime
duration to 25 to 1750 ms. The masks were followed by unambiguous target displays that
matched either the pre- or post-constancy grouping solution of the prime (see Figure 14A
and 26B). For example, with respect to the stimulus presented in Figure 13A, Figure 14A
is the pre-constancy grouping solution. Alternatively, Figure 14B is the post-constancy
grouping solution. Participants reported whether the central circles of the unambiguous
target stimuli grouped with the circles on the right or left. Responses and reaction times
were measured. Reaction times to pre- and post- constancy match targets were compared
to target controls. Based on Schulz and Sanocki's (2003) results, it was expected that
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