"My family learned
about the
Heatherwood
impressive ability by describing
how visual information may be
processed by the brain. After out-
lining it in the journal Cerebral
Cortex (1995; 1:1-11), he recent-
ly presented the model at the in-
ternational meeting Cortical
Dynamics in Jerusalem and will
discuss it further at the Fifth To-
hwa University International
Symposium on New Concepts to
Uncover Higher Brain Func-
tions, to be held in Fukuoka,
Japan, in October this year.
Until now, it has been widely
believed that the brain process-
es visual information in several
stages: it first sends a new im-
age to its so-called "lower" visu-
al areas for analysis and then
passes it "up" to the so-called
"higher" visual area, where it is
matched against previously
stored images. However, this sce-
nario creates a major puzzle: Re-
searchers have found that the
brain has the same number of
connections for transmitting in-
formation to the "higher" storage
area as it does for sending it
down to the "lower" areas. Yet if
all recognition takes place in the
"higher" area, what is the pur-
pose of these return pathways?
Professor Ullman's model may
provide the answer. It suggests
that during recognition, visual
information flows in the brain in
two opposite directions: the new
image is being sent from the
"lower" to the "higher" area,
while at the same time a previ-
ously stored image that needs to
be compared with the new one is
transmitted "downwards."
In the course of the "upwards"
transmission, the brain gener-
ates many versions of the new
image that are adjusted for view-
ing parameters — including, for
example, defining the image's
contours and "normalizing" it for
lighting and size. Similarly, in
the "downward" transmission
the brain creates numerous ver-
sions of the stored image based
on its previous experience — for
example, it may generate multi-
ple images of the same face with
different expressions, affected by
different light and seen at dif-
ferent angles.
The brain then compares the
images in these two "counter
streams," and if it finds a close
match between two images —
which probably occurs some-
where halfway between the "low-
er" and "higher" areas —
recognition takes place.
"Recognition is not a straight-
forward comparison — it's an ac-
tive trial-and-error process
involving multiple transforma-
tions that take place before a
comparison with a stored image
is performed," Professor Ullman
says.
A significant part of his theo-
ry deals with generating nu-
merous images from one. He
believes the brain can do this be-
RECOGNIZE page 54
life-style...
and now I'm living it!"
James C. Carney, M.D.
and Scott G. Lewis, M.D.
Drs. Carney & Lewis, P.C.
are pleased to announce that
Michael G. Kizy, M.D.
Internal Medicine
has joined their practice
Offering personalized adult medical care:
• routine and specialized medical care
• annual health and gynecological exams
• prostate screening and men's health care
.-A010004w.
Come in for a tour,
have lunch with us &
receive your complimentary
gift basket!
MONTHLY
RENT
• Meals served in our elegant
dining room
• Weekly housekeeping & linens
• Cable TV accessible
• 24-Hour emergency system
• Library, game and card rooms
• education and preventive care
Drs. Carney, Lewis and Kizy are on staff at
William Beaumont Hospital, Royal Oak,
and invite you to call today for an appointment.
INCLUDES:
• Full activities program
• Individually controlled heat & air
• Scheduled transportation
• Fully equipped kitchen
• Putting green, walking trails
• Beauty and barber salon
the
• colon cancer screening and flexible
sigmoidoscopy
(810) 355-0880
Drs. Carney & Lewis, P.C.
29201 Telegraph Road, Suite 404
Southfield, Michigan 48304
Mk
OdArl'HERWOOD
RETIREMENT COMMUNITY
NO ENTRY FEES
NO ENDOWMENTS
r
NAME
ADDRESS
CITY
L PHONE (
STATE
ZIP
)
Dr. Kizy received his
medical degree from
Wayne State University
School of Medicine, and his
residency training in
internal medicine from
William Beaumont Hospital
in Royal Oak.
MAIL TO: 22800 Civic Or. Dr. Southfield, MI 48034 Or call (810) 350-1777
DONALD E. GALE, D.D.S.
353-2200
DENTURE
CENTER
HARVARD ROW MALL
21774 WEST 11 MILE RD.
SOUTHFIELD, MI 48076
EXTRACTIONS
DENTURES & PARTIALS
RELINES & REPAIRS
QUALITY DENTURES AT AFFORDABLE PRICES
30 YEARS' EXPERIENCE
Gain Access to
Outstanding
Investment Managers
PaineWebber has the key to finding the right
money manager for individuals and institutions
with portfolios of $100,000 or more.
Find out about PAINEWEBBER ACCESS:
a comprehensive approach to
total portfolio planning and management.
For a free consultation call
Gerald E. Naftaly or Alan A. Gildenberg
at (313) 851-1001 or (800) 533-1407.
PaineWebber
We invest in relationships.
32300 Northwestern Hwy., Suite 150 Farmington Hills, MI 48334
Member SIN:
53