We
investigated
the
effects
of
divided
attention
during
walking
.
Individuals
were
classified
based
on
whether
they
were
walking
while
talking
on
a
cell
phone
,
listening
to
an
MP3
player
,
walking
without
any
electronics
or
walking
in
a
pair
.
In
the
first
study
,
we
found
that
cell
phone
users
walked
more
slowly
,
changed
directions
more
frequently
,
and
were
less
likely
to
acknowledge
other
people
than
individuals
in
the
other
conditions
.
In
the
second
study
,
we
found
that
cell
phone
users
were
less
likely
to
notice
an
unusual
activity
along
their
walking
route
(
a
unicycling
clown
).
Cell
phone
usage
may
cause
inattentional
blindness
even
during
a
simple
activity
that
should
require
few
cognitive
resources
.