Posts tagged science
Articles and news from the latest research reports.
Intelligence: Brain size matters, but so do connections
Measuring human intelligence may be controversial and oh-so-very-tricky to do. The latest study underscores a growing appreciation among neuroscientists for the importance of the brain’s “white matter” — fat-covered clusters of axons that string neurons and the brain’s two hemispheres together— in brain function.
Cancer May Result From Wrong Number of Genes
When a young person develops cancer, doctors most often assume that genetics are the reason, because the patient hasn’t lived long enough to accumulate environmental damage. But it’s been hard to find the faulty DNA behind many tumors. Now, using new genomic technology, scientists have discovered a novel explanation for some testicular cancers, the most common cause of cancer in men under 35. Rather than being triggered by a single gene mutation, the tumors are caused by too many or too few copies of a gene in a person’s cells. These “copy number variations” have been linked to other conditions such as autism, but never before to cancer.
The psychological techniques we use to avoid each other on the bus
A sociologist who rode coach buses for three years has codified the unspoken rules of avoiding total strangers.
"We live in a world of strangers, where life in public spaces feels increasingly anonymous," said sociologist Esther Kim of Yale University in a press release. “However, avoiding other people actually requires quite a lot of effort and this is especially true in confined spaces like public transport.”
Disorders of consciousness: How should clinicians respond to new therapeutic interventions?
August 2, 2012
New tools have confirmed high rates of misdiagnosis of patients with chronic disorders of consciousness, such as the vegetative state. An increasing number of patients’ families wish to use these novel techniques for diagnosis, prognosis, and treatment. An international team of researchers, including Dr. Éric Racine, researcher at the IRCM, analyzed the clinical, social and ethical issues that clinicians are now facing. Their article is published in the August edition of The Lancet Neurology, a renowned journal in the field of clinical neurology.
"Patients with disorders of consciousness have traditionally been regarded as unaware by definition, but findings from recent clinical studies have revealed astounding cases of awareness despite clinical unresponsiveness," explains Dr. Racine, a Montréal neuroethics specialist.
Severe brain injury can leave patients with chronic disorders of consciousness, which are medical conditions that inhibit consciousness. Patients thus have severe motor and cognitive impairments, remain fully dependent on others for all activities of daily living, and have no or very limited means to functionally communicate their thoughts or wishes, depending on their state.
Even with a careful neurological assessment of these types of disorders, some signs of awareness can elude the clinician because the clinical diagnosis relies on the observation of motor signs of awareness, which can be very subtle and fluctuate over time.
New technological developments can now measure brain function both in resting states and in response to simple commands, independent of muscle function, which could help establish a more accurate diagnosis. As a result, diagnostic classifications have been revised and prognostic knowledge is improving. For the first time, therapeutic studies have recently shown the effects of treatment on the improvement of patient responsiveness.
"The medical decision to stop or continue rehabilitation, or to transfer a patient to a long-term care facility can be hard to accept for the family, but one of the most difficult treatment decisions by family members remains whether to continue life-sustaining therapy or to discontinue it and only provide palliative care," says Dr. Racine.
Media coverage of disorders of consciousness has increased and information on the subject is increasingly available to the public. Clinicians such as neurologists, rehabilitation specialists, family doctors, and nurses must answer more requests from patients’ family members for novel diagnostic and therapeutic procedures.
"Clinicians therefore need to be prepared to discuss disorders of consciousness with ethical sensitivity, especially considering that the new procedures remain investigational," adds Dr. Racine. "They must be aware of the level of evidence supporting them and of the unavoidable ethical and social issues involved in responding to requests from patients’ family members."
Provided by Institut de recherches cliniques de Montreal
Source: medicalxpress.com
Fixing the way we fix the brain
Of all the health challenges humans face, few are as insidious as those that involve the death or dysfunction of cells in our brains. These illnesses, a category known as neurodegenerative disease, take from us the very things that make us who we are — our thoughts and our memories, our ability to recognize loved ones, control of our bodies, even our cognitive identity.
For most, diseases such as Alzheimer’s or Parkinson’s attack slowly, leading us down a slope of gradually deteriorating mental or physical function that current scientific methods are able to diagnose only after debilitating symptoms have set in. Even if discovered early, there is no way to prevent their onset, no way to reverse the damage, and no cures.
Driven by the desperate need for better understanding and treatments, a coalition of academic researchers, pharmaceutical companies, and state government is now coming together to confront this challenge in a novel way.
Is the singularity near, or is it already history?
The Singularity is Near is a hybrid of documentary and drama, co-directed by Kurzweil, that tries to explain the why and how of its title. Kurzweil’s alter ego, an animated character called Ramona, illustrates the evolutionary arc of thinking machines. She starts out as a primitive, choppy animation but gradually acquires consciousness.
As Ramona goes about her life, at one point seeing a clinical psychologist, her story is interwoven with documentary footage of Kurzweil explaining why the singularity is near. He tells us how machines are becoming atom-sized and how we are already implanting devices into the brains of people with Parkinson’s disease.
Using Data to Predict Your Future Health
Have you ever gone on a trip and unexpectedly found yourself in need of medical care? What if your condition could have been predicted? Better yet, what if you already had the medicine needed to treat that condition in your luggage?
The Hierarchical Association Rule Model (HARM), which I co-developed with Tyler McCormick of the University of Washington and David Madigan of Columbia University, can help patients be better prepared by warning them (and their doctors) about the conditions they may likely experience next. The predictive modeling tool checks data about an individual patient against other patients in the database with similar situations to help determine future conditions. It also alerts patients about any higher risks they may have for certain types of conditions.
Implantable Telescope Technology
Implantable Miniature Telescope along with the cornea, enlarges images in front of the eye approximately 2.2 or 2.7 times their normal size (depending on the model used). The magnification allows central images to be projected onto healthy perimacular areas of the retina instead of the macula alone, where breakdown of photoreceptors and loss of vision has occurred. This helps reduce the ‘blind spot’ and allows the patient to distinguish and discern images that may have been unrecognizable or difficult to see.
The telescope is about the size of a pea (3.6 mm diameter; 4.4 mm length) and is surgically placed inside the eye.
The patient, known only as TN, was left blind after damage to the visual (striate) cortex in both hemispheres of the brain following consecutive strokes. His eyes are normal but his brain cannot process the information they send in, rendering him totally blind.
Researchers say TN’s successful performance was an example of the phenomenon “blindsight,” and say it suggests that some small amount of information is being transmitted from his undamaged eyes to a more primitive part of his brain, which operates beneath the level of consciousness.
See video
(Credit: audiodude)
Brain at rest by Martijn Steenwijk (Winner Art of Neuroscience 2012)