The Use of Iambic Pentameter in the

soldiers see in these speeded conditions? The answer to this question is not entirely clear.
It is possible that the soldiers will perceive the two intended proximal pushbutton
clusters. In this case, visual search for a target pushbutton will be speeded because the set
size to search is reduced by half. The user simply picks the desired proximal group to
search within and begins to scan that group. But what if the proximal grouping was not
apparent in limited exposure conditions. What if, the pushbuttons were instead perceived
only as being grouped against the gray background by color similarity and closure? In
this case, the set size for visual search would not be reduced into two functionally similar
groups. Rather, the soldiers would have to search through all of the pushbuttons to find
the target function. It should be noted that, in speeded conditions, soldiers with prior
experience could rely on other cues, like positional constancy, to locate the target
pushbuttons. However, this example serves to demonstrate how the physical grouping
may not provide any useful information, despite supplementary cues that might aid the
user.
From all of the previous examples, it becomes clear that there are a variety of task
factors that can limit exposure time to user interface. Limits on exposure time require
users to process the grouping of the elements in interface displays very rapidly. In these
time-limited conditions, is the organization that users perceive the same as in unlimited
conditions? Recent discoveries in vision science would suggest that this is not the case
(Gulick & Stake, 1957; Kurylo, 1997; Moore & Brown, 2001; Navon, 1981; Oliva &
Schyns, 1997; Rauschenberger & Yantis, 2001; Sanocki, 1993; Schulz, 2002; Schulz et
al., 2001; Schulz & Sanocki, 2003; Schyns & Oliva, 1994). Rather, recent discoveries in
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