It’s been known for some time that when our brains are focused on a task, we can fail to see other things that are in plain sight. This phenomenon, known as ‘inattentional blindness’, is exemplified by the famous ‘invisible gorilla’ experiment in which people watching a video of players passing around a basketball and counting the number of passes fail to observe a man in a gorilla suit walking across the centre of the screen.
The new results reveal that our visual field does not need to be cluttered with other objects to cause this ‘blindness’ and that focusing on remembering something we have just seen is enough to make us unaware of things that happen around us.
Professor Nilli Lavie from UCL Institute of Cognitive Neuroscience, who led the study, explains: “An example of where this is relevant in the real world is when people are following directions on a sat nav while driving.
“Our research would suggest that focusing on remembering the directions we’ve just seen on the screen means that we’re more likely to fail to observe other hazards around us on the road, for example an approaching motorbike or a pedestrian on a crossing, even though we may be ‘looking’ at where we’re going.”
Participants in the study were given a visual memory task to complete while the researchers looked at the activity in their brains using functional magnetic resonance imaging. The findings revealed that while the participants were occupied with remembering an image they had just been shown, they failed to notice a flash of light that they were asked to detect, even though there was nothing else in their visual field at the time.
The participants could easily detect the flash of light when their mind was not loaded, suggesting that they had established a ‘load induced blindness’. At the same time, the team observed that there was reduced activity in the area of the brain that processes incoming visual information – the primary visual cortex.
Professor Lavie adds: “The ‘blindness’ seems to be caused by a breakdown in visual messages getting to the brain at the earliest stage in the pathway of information flow, which means that while the eyes ‘see’ the object, the brain does not.”
The idea that there is competition in the brain for limited information processing power is known as load theory and was first proposed by Professor Lavie more than a decade ago. The theory explains why the brain fails to detect even conspicuous events in the visual field, like the man in a gorilla suit, when attention is focused on a task that involves a high level of information load.
The research reveals a pathway of competition in the brain between new visual information and our short-term visual memory that was not appreciated before. In other words, the act of remembering something we’ve seen that isn’t currently in our field of vision means that we don’t see what we’re looking at.
Showing posts with label Nature. Show all posts
Showing posts with label Nature. Show all posts
Inattentional Blindness: How Memory Load Leaves Us ‘Blind’ To New Visual Information
Trying to keep an image we’ve just seen in memory can leave us blind to things we are ‘looking’ at, according to the results of a new study supported by the Wellcome Trust.
It’s been known for some time that when our brains are focused on a task, we can fail to see other things that are in plain sight. This phenomenon, known as ‘inattentional blindness’, is exemplified by the famous ‘invisible gorilla’ experiment in which people watching a video of players passing around a basketball and counting the number of passes fail to observe a man in a gorilla suit walking across the centre of the screen.
The new results reveal that our visual field does not need to be cluttered with other objects to cause this ‘blindness’ and that focusing on remembering something we have just seen is enough to make us unaware of things that happen around us.
Professor Nilli Lavie from UCL Institute of Cognitive Neuroscience, who led the study, explains: “An example of where this is relevant in the real world is when people are following directions on a sat nav while driving.
“Our research would suggest that focusing on remembering the directions we’ve just seen on the screen means that we’re more likely to fail to observe other hazards around us on the road, for example an approaching motorbike or a pedestrian on a crossing, even though we may be ‘looking’ at where we’re going.”
Participants in the study were given a visual memory task to complete while the researchers looked at the activity in their brains using functional magnetic resonance imaging. The findings revealed that while the participants were occupied with remembering an image they had just been shown, they failed to notice a flash of light that they were asked to detect, even though there was nothing else in their visual field at the time.
The participants could easily detect the flash of light when their mind was not loaded, suggesting that they had established a ‘load induced blindness’. At the same time, the team observed that there was reduced activity in the area of the brain that processes incoming visual information – the primary visual cortex.
Professor Lavie adds: “The ‘blindness’ seems to be caused by a breakdown in visual messages getting to the brain at the earliest stage in the pathway of information flow, which means that while the eyes ‘see’ the object, the brain does not.”
The idea that there is competition in the brain for limited information processing power is known as load theory and was first proposed by Professor Lavie more than a decade ago. The theory explains why the brain fails to detect even conspicuous events in the visual field, like the man in a gorilla suit, when attention is focused on a task that involves a high level of information load.
The research reveals a pathway of competition in the brain between new visual information and our short-term visual memory that was not appreciated before. In other words, the act of remembering something we’ve seen that isn’t currently in our field of vision means that we don’t see what we’re looking at.
It’s been known for some time that when our brains are focused on a task, we can fail to see other things that are in plain sight. This phenomenon, known as ‘inattentional blindness’, is exemplified by the famous ‘invisible gorilla’ experiment in which people watching a video of players passing around a basketball and counting the number of passes fail to observe a man in a gorilla suit walking across the centre of the screen.
The new results reveal that our visual field does not need to be cluttered with other objects to cause this ‘blindness’ and that focusing on remembering something we have just seen is enough to make us unaware of things that happen around us.
Professor Nilli Lavie from UCL Institute of Cognitive Neuroscience, who led the study, explains: “An example of where this is relevant in the real world is when people are following directions on a sat nav while driving.
“Our research would suggest that focusing on remembering the directions we’ve just seen on the screen means that we’re more likely to fail to observe other hazards around us on the road, for example an approaching motorbike or a pedestrian on a crossing, even though we may be ‘looking’ at where we’re going.”
Participants in the study were given a visual memory task to complete while the researchers looked at the activity in their brains using functional magnetic resonance imaging. The findings revealed that while the participants were occupied with remembering an image they had just been shown, they failed to notice a flash of light that they were asked to detect, even though there was nothing else in their visual field at the time.
The participants could easily detect the flash of light when their mind was not loaded, suggesting that they had established a ‘load induced blindness’. At the same time, the team observed that there was reduced activity in the area of the brain that processes incoming visual information – the primary visual cortex.
Professor Lavie adds: “The ‘blindness’ seems to be caused by a breakdown in visual messages getting to the brain at the earliest stage in the pathway of information flow, which means that while the eyes ‘see’ the object, the brain does not.”
The idea that there is competition in the brain for limited information processing power is known as load theory and was first proposed by Professor Lavie more than a decade ago. The theory explains why the brain fails to detect even conspicuous events in the visual field, like the man in a gorilla suit, when attention is focused on a task that involves a high level of information load.
The research reveals a pathway of competition in the brain between new visual information and our short-term visual memory that was not appreciated before. In other words, the act of remembering something we’ve seen that isn’t currently in our field of vision means that we don’t see what we’re looking at.
Pelvic Exams While Under Anesthesia Sparks Debate
As a medical student, Dr. Shawn Barnes had an experience that he says left him feeling ashamed and conflicted. During his rotation through the obstetrics and gynecology ward of a teaching hospital in Hawaii, Barnes performed pelvic exams on women under anesthesia without the women’s explicit consent to the procedure.
The women were all having gynecological surgery, and had signed a long form indicating they agreed to allow medical students to be involved in their care.
However, to Barnes, the “implicit consent” patients gave when signing the forms didn’t ensure they understood exactly what happened while they were unconscious — a relatively inexperienced medical student palpated their ovaries and uteruses to check for, and better understand, potential abnormalities in these organs.
“For three weeks, four to five times a day, I was asked to, and did, perform pelvic examinations on anesthetized women,” Barnes wrote in an editorial published in the October issue of the journal Obstetrics and Gynecology.
Teaching hospitals should stop this practice, Barnes told MyHealthNewsDaily. Instead, patients should be asked to “explicitly consent” to the procedure, meaning they specifically say they will allow a medical student to conduct a pelvic exam.
Two doctors at a Boston hospital, writing in a counterpoint to Barnes’ editorial, say they agree that obtaining only implicit consent is “morally unsound,” but also say that this practice has largely faded away. Guidelines from doctors’ groups say that women should be fully informed about the procedure, they noted.
“We have many providers who trained in other institutions, and in conversation with them,” it’s clear that women are usually asked specifically for their consent to a student-performed exam, said Dr. Carey York-Best, an obstetrician and gynecologist at Massachusetts General Hospital and one of the doctors who wrote the counterpoint to Barnes’ editorial.
But Barnes says the exams are done without explicit consent more often than these doctors indicate. A 2003 survey of Philadelphia medical students found that 90 percent reported being asked to perform pelvic exams on women who had not explicitly consented to the procedure.
Both Barnes and York-Best said there are no recent data available on exactly how many hospitals nationwide are not abiding by the guidelines recommending that explicit consent be obtained.
In any case, Barnes said that guidelines do not govern real-world practice — for this, laws are needed. During his residency, Barnes said he raised his concerns regarding pelvic exams with his superiors, but was told these exams were a long-standing, standard practice. “In fact, I was told I was the first medical student or resident in institutional memory to express concern over the practice,” he wrote in his editorial.
York-Best said such laws would potentially overregulate doctors’ activities, and that the field is already far more regulated than many others.
Why not just ask for permission?
Performing pelvic exams on anesthetized women just prior to surgery provides medical students with a unique and valuable learning experience, Barnes and York-Best both said. For one, muscles relax under anesthesia, allowing the exam to proceed more easily and giving the surgeon and medical student a clearer picture from which to plan the details of the surgery.
Additionally, women undergoing surgery have conditions that make their anatomy abnormal. Most patients who come in for routine exams performed by medical students don’t have gynecological diseases, but medical students need to be able to recognize and diagnose abnormalities. [5 Things Women Should Know About Ovarian Cancer]
In his editorial, Barnes presented the arguments he heard — from attending physicians, residents, and other medical students, along with published medical literature — that a woman’s signature on a long form was sufficient proof of her consent.
One argument is that such consent forms are simply the standard practice, so the exams are not an issue. But the fact that professional guidelines — from groups such as the American College of Obstetricians and Gynecologists and the American Medical Association — say that explicit consent is needed shows that this should not be the standard practice, Barnes said.
Another argument he heard is that medical students don’t ask for specific permission to retract tissue or cut sutures during surgery, and that the pelvic exam portion of the procedure is no different.
But Barnes argues that it is different. In fact, male medical students must be chaperoned when performing pelvic exams on conscious patients, but not when they remove surgical staples — this requirement reflects an understanding on the part of medical practitioners a pelvic exam is a more personal practice.
Do guidelines do enough, or are laws needed?
York-Best and her co-author, Dr. Jeffrey Ecker, suggest that the physician responsible for the patient’s care should ask the patient for permission to allow a student to perform the exam, ideally well before the surgery. Patients should also be given the opportunity to meet the medical student prior to the surgery, they write.
Most patients are willing to let the student do an examination when asked by their own physicians, York-Best said, pointing to a 2009 study in which 74 percent of patients consented to a student performing a pelvic exam when they were asked by their doctor. In contrast, another study found that 53 percent consented when they were asked by students.
“When it is a stranger, especially a nervous or awkward student, who asks, they do not yet know if they can trust that person, and are likely to err on the side of saying no,” York-Best said.
It’s important for doctors at teaching hospitals to advocate for the teaching process in order to ensure that their students receive adequate training, she said.
Barnes called this “a good idea,” but maintained that laws are needed to make sure that women understand what they are consenting to.
Hawaii is now one of four states (California, Illinois and Virginia are the others) where doctors are legally required to obtain specific consent for pelvic exams under anesthesia. The Hawaii law grew out of Barnes’ outreach to lawyers about the issue, and he testified before the state legislature regarding the practice while the bill was under consideration.
“For three weeks, four to five times a day, I was asked to, and did, perform pelvic examinations on anesthetized women,” Barnes wrote in an editorial published in the October issue of the journal Obstetrics and Gynecology.
Teaching hospitals should stop this practice, Barnes told MyHealthNewsDaily. Instead, patients should be asked to “explicitly consent” to the procedure, meaning they specifically say they will allow a medical student to conduct a pelvic exam.
Two doctors at a Boston hospital, writing in a counterpoint to Barnes’ editorial, say they agree that obtaining only implicit consent is “morally unsound,” but also say that this practice has largely faded away. Guidelines from doctors’ groups say that women should be fully informed about the procedure, they noted.
“We have many providers who trained in other institutions, and in conversation with them,” it’s clear that women are usually asked specifically for their consent to a student-performed exam, said Dr. Carey York-Best, an obstetrician and gynecologist at Massachusetts General Hospital and one of the doctors who wrote the counterpoint to Barnes’ editorial.
But Barnes says the exams are done without explicit consent more often than these doctors indicate. A 2003 survey of Philadelphia medical students found that 90 percent reported being asked to perform pelvic exams on women who had not explicitly consented to the procedure.
Both Barnes and York-Best said there are no recent data available on exactly how many hospitals nationwide are not abiding by the guidelines recommending that explicit consent be obtained.
In any case, Barnes said that guidelines do not govern real-world practice — for this, laws are needed. During his residency, Barnes said he raised his concerns regarding pelvic exams with his superiors, but was told these exams were a long-standing, standard practice. “In fact, I was told I was the first medical student or resident in institutional memory to express concern over the practice,” he wrote in his editorial.
York-Best said such laws would potentially overregulate doctors’ activities, and that the field is already far more regulated than many others.
Why not just ask for permission?
Performing pelvic exams on anesthetized women just prior to surgery provides medical students with a unique and valuable learning experience, Barnes and York-Best both said. For one, muscles relax under anesthesia, allowing the exam to proceed more easily and giving the surgeon and medical student a clearer picture from which to plan the details of the surgery.
Additionally, women undergoing surgery have conditions that make their anatomy abnormal. Most patients who come in for routine exams performed by medical students don’t have gynecological diseases, but medical students need to be able to recognize and diagnose abnormalities. [5 Things Women Should Know About Ovarian Cancer]
In his editorial, Barnes presented the arguments he heard — from attending physicians, residents, and other medical students, along with published medical literature — that a woman’s signature on a long form was sufficient proof of her consent.
One argument is that such consent forms are simply the standard practice, so the exams are not an issue. But the fact that professional guidelines — from groups such as the American College of Obstetricians and Gynecologists and the American Medical Association — say that explicit consent is needed shows that this should not be the standard practice, Barnes said.
Another argument he heard is that medical students don’t ask for specific permission to retract tissue or cut sutures during surgery, and that the pelvic exam portion of the procedure is no different.
But Barnes argues that it is different. In fact, male medical students must be chaperoned when performing pelvic exams on conscious patients, but not when they remove surgical staples — this requirement reflects an understanding on the part of medical practitioners a pelvic exam is a more personal practice.
Do guidelines do enough, or are laws needed?
York-Best and her co-author, Dr. Jeffrey Ecker, suggest that the physician responsible for the patient’s care should ask the patient for permission to allow a student to perform the exam, ideally well before the surgery. Patients should also be given the opportunity to meet the medical student prior to the surgery, they write.
Most patients are willing to let the student do an examination when asked by their own physicians, York-Best said, pointing to a 2009 study in which 74 percent of patients consented to a student performing a pelvic exam when they were asked by their doctor. In contrast, another study found that 53 percent consented when they were asked by students.
“When it is a stranger, especially a nervous or awkward student, who asks, they do not yet know if they can trust that person, and are likely to err on the side of saying no,” York-Best said.
It’s important for doctors at teaching hospitals to advocate for the teaching process in order to ensure that their students receive adequate training, she said.
Barnes called this “a good idea,” but maintained that laws are needed to make sure that women understand what they are consenting to.
Hawaii is now one of four states (California, Illinois and Virginia are the others) where doctors are legally required to obtain specific consent for pelvic exams under anesthesia. The Hawaii law grew out of Barnes’ outreach to lawyers about the issue, and he testified before the state legislature regarding the practice while the bill was under consideration.
5 Ideas for a Healthy Breakfast
Mornings can be rough. You hit the snooze button one too many times, have an extra cup of coffee to get you going, and then you’re rushing out the door before you know what hit you. But, what about breakfast?
I’ve always been a stickler about making time for breakfast. Even as my kids got older, I wouldn’t let them leave the house without some fiber in their systems. Breakfast is an important part of the day because it starts your metabolism and it fuels your body with the nutrients and carbohydrates you need.
Now,a study published this year in the American Journal of Clinical Nutrition gives us yet another good reason to eat breakfast every morning: it may also reduce your risk for type 2 diabetes.
This study found that men who skipped breakfast were 21 percent more likely to have type 2 diabetes in their lifetimes. It’s important to note, though, that what you eat for breakfast may be just as important as whether you eat. A 2008 in the same journal looked meal timing and showed that people who consumed carbs at breakfast (as opposed to at dinner) were less likely to have high glucose levels.
I’d like to point out that not all carbs are created equal. There are carbs — such as refined sugar and flour — that will spike your blood sugar levels regardless of when you eat them. And then there are healthy carbs that give you energy over a longer period of time. So, I can’t justify eating a giant “everything” bagel loaded with cream cheese, but there are some breakfast foods that I can really get behind.
When you’re planning your breakfast, always include some fat, protein and healthy carbs. The combination will keep you feeling full longer without boosting your blood sugar levels.
Here are some ideas:
Cold cereal or oatmeal with 1 percent milk and a small handful of nuts. This is one of my go-to breakfast meals because it’s very high in fiber, easy to prepare and requires very few ingredients.
One or two eggs served with whole grain, wheat or rye toast and fruit. It’s a no-frills meal with all the good stuff you need to start your day.
Breakfast burrito made with beans, eggs and low-fat cheese in a high-fiber tortilla. This is a great meal for a Sunday when you have a little extra time to prepare your meal.
Whole grain English muffin with lox and low-fat cream cheese. If you feel like you’re missing out on that giant bagel, this is a good alternative.
Cottage cheese and fruit. You can choose any kind of fruit. Personally, I like pineapple chunks with my cottage cheese.
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