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david packard sheth had david packard dot com had never heard of the invisible
guerrilla studied this is where uh... subjects are suppose showed a video of
two teams of kids once he wears white the other team wears black
they're passing to basketball's back and forth between players as they dodge and
weave around each other before it starts viewers are told
you have to do one thing here count how many times
the players wearing white
pass the ball to each other
this isn't really that easy because people are moving all around you really
need to focus to do and about thirty seconds into the video
a man wearing a gorilla suit walks onto the screen right in the middle of the
circle of kids stops in the middle look straight ahead beats his chest and then
casually strolls off the screen
when people afterwards or asked did you see the guerilla fifty percent of people
never noticed that a guy in a guerilla sue walked out
beat is just cuz they were too busy concentrating on what they stock
really was the point of the study
well i for her to fascinating piece on npr which talked about traffic andrews
inattention researcher at harvard medical school
visiting these kind of cave lake there called the reading rooms a radiologist
do their work
m_r_i_s cat-scans x_-rays and they're they're looking for a very specific
things illnesses
uh... bridges writing up reports based on different studies that are done
and drew wanted to understand more about how do radiologist sometimes fail to see
important things
and he decided to
show about the date but the way you put this together with the with the best way
to explain it
he said i want you to look on this image which i'm about to put up for you
for cancer you're looking for cancer in the ones you looking for cancer is not
jewels in the lungs let's put up the picture
that was used in this study
now as you can see here at quick glance you might say oh that's interesting it's
lines what you may notice upon further inspection is that on the right side
aunt out saying this for people who are watching there is a van energy of a
guerilla superimposed onto this now it is dark and it is over the darker part
of the uh... of of the image
but but but significant number eighty three percent of radiologist did not
notice that the gorilla
this really is a study about what we're focused on right and what one
radiologist said is listen
the gorilla in this image is black
and as a radiologist black things in line is usually have no significance
cancer is white
pneumonia is white
acute disease everything but collapsed lungs it's white
so a collapsed lung is in this location and it's not like so really
it was missed it but at the same time
it's not the type of thing that has any clinical significance
what do you think of that explanation what do you think of the study
i think uh... i mean i here
considering what people do focus on the back think
it is
a reasonable explanation for rite aid myths that or why more than eight out of
ten did not see that there was a guerilla in this thing but at the same
time i mean
shouldn't you be scouring every pixel this image uh... i mean
by i don't like the sound of that i would much rather go to the today
uh... two guys who who side i think that's on an interesting way the two out
of ten separate an interesting additional way that this could have been
tested is to actually shows some people images
that they had to show images that do you have some cancers na jules and see if
there's a correlation between the radiologist who miss the guerilla and
those who missed the cancer's not jewels
i mean i think it's a pretty normal thing it's being confirmed in a lot of
studies that people's attention was focused on one thing
when they're given instructions they tender just ignore everything else there
is a study done where people were in a driving simulator and they were told
uh... pay very close attention to the other cars on the simulated road
and uh... not run them over and not touch them at all at the end of the
death of people if they saw anything strange and then they iran it back and
they saw that they have run over a bunch of motorcycle right because they were
told that motorcycles were something they were source to focus on right so
this really brings up another issue which is
when we when we do most of these tests in most cases the radiologist already
knows what diagnosis is looking to be confirmed or or ruled out
and i wonder weather on the long-term it's more beneficial overall for the
health of the patients to have a radiologist going with a completely open
mind and just analyze what they see without any prejudice about specifically
what condition is being looked for or not and uh... dot i would be interested
in seeing some studies on that too
that's very hard to train your brain to do that but i've basically when it comes
to anything
right by me no matter what you're looking at there's usually usually some
form of prejudice all this gets us back to the checklist manifesto i forget than
the day many uh... author who wrote the check was manifest of the same doesn't
matter how many times you've done it
if you have a checklist is to say when we are looking at once
this is the order and this is the process of what we go through that it's
useful even for the most experienced radiologist i would be a son something a
look at all so indeed