lp3 - 10/13/10
 Locomo*on
con*nued….
...

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Unformatted text preview: 10/13/10
 Locomo*on
con*nued….
 New
Challenges
 Lab
1
Due
Date
Reminders
 •  Tuesday’s
Lab

due
Tuesday
Oct.
19th
 •  Thursday’s
Lab

due
Thursday
Oct.
21st
 –  Upload
file
to
Blackboard
by
5pm
on
due
date
 –  Turn
in
hardcopy
in
class
on
due
date
(or
in
my
 mailbox
by
5pm)
 Influences
on
Locomotor
Timeline
 •  Cultural
Effects
 •  Historical
Changes
 1
 10/13/10
 Cultural
Effects
 •  In
some
cultures,
infants
walk
before
they
 crawl
or
skip
crawling
altogether.
 •  Jamaica
and
Mali:
mothers
view
crawling
as
 dangerous,
primi*ve,
and
unnecessary
 Cultural
Effects
 •  Jamaica
and
Mali:
mothers
view
crawling
as
 dangerous,
primi*ve,
and
unnecessary
 –  Daily
massage
and
vigorous
exercise
rou*nes
 –  Walk
months
earlier
than
infants
in
Western
 cultures.

 •  Western
Kenya:
exercise
their
infants’
upright
 stepping
and
jumping
movements

walk
 sooner
than
infants
in
cultures
that
do
not
 exercise
their
infants’
locomotor
skills


 2
 10/13/10
 Cultural
Effects
 •  In
some
cultures,
infants
experience
 locomotor
“delays”
 •  China:

Infants
show
3.3‐month
delay
in
the
 onset
of
locomo*on
 •  Why?
 Historical
Changes
 •  In
1900,
40%
of
Western,
middle‐class
infants
 skipped
crawling;
instead,
scooted
in
a
sicng
 posi*on.
 •  Why?
 Historical
Changes
 •  Link
between
changes
in
child
rearing
and
 infant
crawling
 •  Sleeping
on
stomachs
vs.
sleeping
on
backs
 •  Importance
of
“tummy
*me”
 3
 10/13/10
 New
Challenges
Faced
by
Walkers
 •  Genera*ng
and
using
new
sources
of
 perceptual
informa*on
for
controlling
their
 motor
ac*ons
adap*vely
 •  Fric*on/Rigidity
of
surfaces
 Surface
Rigidity
 4
 10/13/10
 Foam
Pit
15‐month‐old
 Foam
Pit
3‐year‐old
 Foam
Pit
Adult
 5
 10/13/10
 Surface
Rigidity:
 Learning
*meline
 •  15‐month‐olds
 •  Older
children
 •  Adults
 Surface
Rigidity
 Surface
Fric*on
 6
 10/13/10
 Surface
Fric*on
15‐month‐old
 Rigidity
and
Fric*on
 •  Difficulty
linking
arbitrary
visual
cues
with
loss
 of
balance
 •  Infants:
Visual
appearance
of
ground
surface
 as
not
predic*ng
falling.

 Climbing
Stairs
 •  Stairs
pose
a
poten*al
danger
for
newly
 mobile
infants
and
toddlers
 •  Nearly
1
million
people
are
treated
in
 hospitals
for
falls
on
stairs
and
steps
each
year
 •  Infants
are
at
greater
risk
from
falling
down
 stairs
than
toddlers
or
older
children
 7
 10/13/10
 Crawling
on
stairs
 •  Crawling
up
stairs
around
11
months
 •  Crawling
down
stairs
around
12.5
months
 Crawling
Up
Stairs
 Crawling
Down
Stairs:

 Backing
Down
 8
 10/13/10
 Crawling
Down
Stairs:

 Scoo*ng
down
sicng
 Crawling
on
Stairs
 •  Influences
on
onset
ages
of
stair
climbing
 milestones
 Cogni*on‐Ac*on
Tradeoff
revisited
 •  Cogni*on‐Ac*on
Tradeoff?
 9
 10/13/10
 Cogni*on‐Ac*on
Tradeoff
revisited
 •  Classic
A‐not‐B
task
 •  Persevera*ve
errors
 Cogni*on‐Ac*on
Tradeoff
revisited
 •  Sarah
Berger
(2004)
 •  Locomotor
version
of
the
A‐not‐B
task
 •  13‐month‐old
infants
 Cogni*on‐Ac*on
Tradeoff
revisited
 Training
 Floor
Condi*on:
 Easy
Motor
 Stair
Condi*on: Difficult
motor
 10
 10/13/10
 Cogni*on‐Ac*on
Tradeoff
Revisited
 Cogni*on‐Ac*on
Tradeoff
Revisted
 Cogni*on‐Ac*on
Tradeoff
Revisted
 •  Easy
Motor
vs.
Difficult
Motor
 •  Easy
Motor
vs.
Extra‐difficult
Motor
 11
 ...
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This note was uploaded on 02/17/2011 for the course HK 453 taught by Professor Claxton during the Fall '10 term at Purdue University.

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