Most of the time, we learn only gradually, incrementally building connections between actions or events and outcomes. But there are exceptions--every once in a while, something happens and we immediately learn to associate that stimulus with a result. For example, maybe you have had bad service at a store once and sworn that you will never shop there again.
Brain
Anyone who has ever tried to lose weight knows that it's no fun to feel hungry. In fact, the drive to tame gnawing hunger pangs can sabotage even the best-intentioned dieter. But how exactly is it that fasting creates these uncomfortable feelings - and consuming food takes them away?
If you're finding it difficult to stick to a weight-loss diet, scientists at the Howard Hughes Medical Institute's Janelia Research Campus say you can likely blame hunger-sensitive cells in your brain known as AGRP neurons. According to new experiments, these neurons are responsible for the unpleasant feelings of hunger that make snacking irresistible.
Scientists have discovered that neurons are risk takers: They use minor "DNA surgeries" to toggle their activity levels all day, every day. Since these activity levels are important in learning, memory and brain disorders, the researchers think their finding will shed light on a range of important questions. A summary of the study will be published online in the journal Nature Neuroscience on April 27.
Scientists have discovered a way to prevent the development of multiple sclerosis (MS) in mice. Using a drug that blocks the production of a certain type of immune cell linked to inflammation and autoimmunity, the researchers successfully protected against the onset of MS in an animal model of the disease. The scientists say the next step is to test this strategy using other autoimmune disorders.
Chemotherapy can lead to excessive mind wandering and an inability to concentrate. Dubbed 'chemo-brain,' the negative cognitive effects of the cancer treatment have long been suspected, according to a University of British Columbia study which says it is the first to explain why patients have difficulty paying attention.
Researchers from Georgetown University Medical Center and American University have shown that, like humans, mustached bats use the left and right sides of their brains to process different aspects of sounds. Aside from humans, no other animal that has been studied, not even monkeys or apes, has proved to use such hemispheric specialization for sound processing -- meaning that the left brain is better at processing fast sounds, and the right processing slow ones.
A study from the Texas A&M Health Science Center School of Public Health finds students with standing desks are more attentive than their seated counterparts. In fact, preliminary results show 12 percent greater on-task engagement in classrooms with standing desks, which equates to an extra seven minutes per hour of engaged instruction time.
New research published today in the journal Nature Communications represents a potentially fundamental shift in our understanding of how nerve cells in the brain generate the energy needed to function. The study shows neurons are more independent than previously believed and this research has implications for a range of neurological disorders.
Researchers have developed an imageable mouse model of brain-metastatic breast cancer and shown the potential of a stem-cell-based therapy to eliminate metastatic cells from the brain and prolong survival.
When people hear the sound of footsteps or the drilling of a woodpecker, the rhythmic structure of the sounds is striking, says Michael Wehr, a professor of psychology at the University of Oregon. Even when the temporal structure of a sound is less obvious, as with human speech, the timing still conveys a variety of important information, he says. When a sound is heard, neurons in the lower subcortical region of the brain fire in sync with the rhythmic structure of the sound, almost exactly encoding its original structure in the timing of spikes.
You are driving to work, late for an important meeting. You are almost there when you have to stop at a red light. When will you begin inching forward? Doing it too early will result in wasting gas and energy, but doing it at the right time will get you to work faster. Estimating the right moment to perform an action critically depends on our innate ability to track time. What is the neural mechanism that underlies this capacity?
A new study led by University of Toronto researcher Dr. David Lam has discovered the trigger behind the most severe forms of cancer pain. Released in top journal Pain this month, the study points to TMPRSS2 as the culprit: a gene that is also responsible for some of the most aggressive forms of androgen-fuelled cancers.
The widely held belief that depression is due to low levels of serotonin in the brain - and that effective treatments raise these levels - is a myth, argues a leading psychiatrist in The BMJ this week.
David Healy, Professor of Psychiatry at the Hergest psychiatric unit in North Wales, points to a misconception that lowered serotonin levels in depression are an established fact, which he describes as "the marketing of a myth."
Nerve cells come in very different shapes. Researchers at the Bernstein Center Berlin now reveal why, in insects, the cell body is usually located at the end of a separate extension. Using mathematical models, they show that this increases the strength of electrical signal transmission at no additional energetic cost.