The Use of Iambic Pentameter in the

Experiment 1
What type of grouping information do users best perceive in time limited user
interface conditions? Is this information the same as that perceived in longer exposures
Method
by interface designers? Experiment 1 was designed to address these questions.
In Experiment 1, common region served as the global grouping principle and
connectedness served as the local grouping principle. For example, in Figure 22A, the
central pushbutton groups by common region with the pushbuttons on the left side and
grouped by connectedness with the pushbuttons on the right side. In this stimulus,
common region is depicted as being global when compared to connectedness, because it
is depicted as being the larger scale shape in area and more of an exterior contour. More
specifically, in this stimulus, common region is depicted as being 2.5 times as high and 7
times as wide as connectedness.
Participants were familiarized with the grouping task by grouping unambiguous
practice displays for ten trials. After the practice period, ambiguous experimental and
neutral primes were randomly presented to participants via PsyScope. There were 12
blocks of trials, each containing 24 trials each. Trial blocks were separated by a rest
period that continued until the participant decided to begin the next block. Primes were
masked to limit exposure duration to 50 and 4000ms between participants. Note that the
short stimulus duration utilized a 50ms exposure duration, instead of the 200ms duration
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