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Mammalian Brain Knows Where It’s at

By Guest PostDecember 8, 2012Sciencebehavior, brain, brain injury, brown university, conventional wisdom, depression, disease, egocentric movement, electrical activity, fish sculpture, frequency, hippocampus, humans, journal, location, memory, neuron, neuropsychiatric diseases, neuroscientist, object, omar ahmed, parahippocampal cortex, pattern, phc, por, postrhinal cortex, primate neuroanatomy, rebecca burwell, region, rhythm, schizophrenia, sharon furtak, Space, spiking, theta, treat

A new study in the journal Neuron suggests that the brain uses a different region than neuroscientists had thought to associate objects and locations in the space around an individual. Knowing where this fundamental process occurs could help treat disease and brain injury as well as inform basic understanding of how the brain supports memory and guides behavior.

PROVIDENCE, R.I. [Brown University] — Where are you?

Conventional wisdom in brain research says that you just used your hippocampus to answer that question, but that might not be the whole story. The context of place depends on not just how you got there, but also the things you see around you. A new study in Neuron provides evidence that a different part of the brain is important for understanding where you are based on the spatial layout of the objects in that place. The finding, in rats, has a direct analogy to primate neuroanatomy. (more…)

Multiple Media Use Tied to Depression, Anxiety

By Guest PostDecember 4, 2012Culture, Health, Mediaamerican youth, anxiety, cell phones, christopher hopwood, computer game, depression, mark becker, media multitasking, media use, mental health, michigan state university, multiple, playing, problem, reem alzahabi, social anxiety, symptom, text messaging, watching tv, web surfing

Using multiple forms of media at the same time – such as playing a computer game while watching TV – is linked to symptoms of anxiety and depression, scientists have found for the first time.

Michigan State University’s Mark Becker, lead investigator on the study, said he was surprised to find such a clear association between media multitasking and mental health problems. What’s not yet clear is the cause. (more…)

Science Supports Sex Addiction as a Legitimate Disorder

By Guest PostOctober 24, 2012Healthanxiety, Bible, bipolar disorder, commercial, cybersex, depression, disorder, dsm 5, healthy sex, heather mckittrick, hypersexual behavior, hypersexual disorder, life, margarit davtian, masturbation, mental health, pornography, psychiatric condition, psychiatric diagnose, psychiatry, radio, rory reid, scientific evidence, sex addiction, sex workers, sexual activity, sexual addiction, sexual behavior, sexual fantasies, sexually transmitted infection, sheila garos, substance abuse, talk show, timothy fong, ucla

UCLA researchers test proposed criteria for diagnosing ‘hypersexual disorder’

The idea that an individual might suffer from a sexual addiction is great fodder for radio talk shows, comedians and late night TV. But a sex addiction is no laughing matter. Relationships are destroyed, jobs are lost, lives ruined.

Yet psychiatrists have been reluctant to accept the idea of out-of-control sexual behavior as a mental health disorder because of the lack of scientific evidence.

Now a UCLA-led team of experts has tested a proposed set of criteria to define “hypersexual disorder,” also known as sexual addiction, as a new mental health condition. (more…)

Yale Team Discovers How Stress and Depression Can Shrink the Brain

By Guest PostAugust 20, 2012Health, Scienceanimal model, antidepressant therapy, ashley lepack, bhavya voleti, brain, brain cell, brain mass, brain volume, chronic stress, cognitive impairment, depression, emotional, gata1, gene, gene activation, genetic switch, h j kang, mounira banasr, pattern, pawel licznerski, prefrontal cortex, ronald duman, shrink, stress, symptoms of depression, synaptic connection, transcription factor, yale

Major depression or chronic stress can cause the loss of brain volume, a condition that contributes to both emotional and cognitive impairment. Now a team of researchers led by Yale scientists has discovered one reason why this occurs — a single genetic switch that triggers loss of brain connections in humans and depression in animal models.

The findings, reported in the Aug. 12 issue of the journal Nature Medicine, show that the genetic switch known as a transcription factor represses the expression of several genes that are necessary for the formation of synaptic connections between brain cells, which in turn could contribute to loss of brain mass in the prefrontal cortex. (more…)

Common Parasite May Trigger Suicide Attempts

By Guest PostAugust 18, 2012Health, Scienceamerica, biological change, biological mechanism, brain, brain cell, damage, depression, harmless, infection, inflammation, lena brundin, parasite, parkinsons disease, suicide attempt, symptom, t gondii, teodor postolache, toxoplasma gondii, united states

EAST LANSING, Mich. — A parasite thought to be harmless and found in many people may actually be causing subtle changes in the brain, leading to suicide attempts.

New research appearing in the August issue of The Journal of Clinical Psychiatry adds to the growing work linking an infection caused by the Toxoplasma gondii parasite to suicide attempts. Michigan State University’s Lena Brundin was one of the lead researchers on the team.

About 10-20 percent of people in the United States have Toxoplasma gondii, or T. gondii, in their bodies, but in most it was thought to lie dormant, said Brundin, an associate professor of experimental psychiatry in MSU’s College of Human Medicine. In fact, it appears the parasite can cause inflammation over time, which produces harmful metabolites that can damage brain cells. (more…)

Meditation Reduces Loneliness

By Guest PostAugust 15, 2012Health, Sciencealzheimer's disease, brain, chronic inflammation, crp, david creswell, depression, expression, heart disease, helen lavretsky, immune system, infection, inflammation, inflammatory gene, loneliness, mbsr, meditation, meditative technique, michael irwin, mindfulness, natural component, nf kb, pro inflammatory gene, protein marker, risk, tai chi, yoga

UCLA study also finds that mindfulness technique benefits immune system

Many elderly people spend their last years alone. Spouses pass and children scatter. But being lonely is much more than a silent house and a lack of companionship. Over time, loneliness not only takes a toll on the psyche but can have a serious physical impact as well.

Feeling lonely has been linked to an increased risk of heart disease, Alzheimer’s disease, depression and even premature death. Developing effective treatments to reduce loneliness in older adults is essential, but previous treatment efforts have had limited success. (more…)

Some Harmful Effects of Light at Night Can Be Reversed, Study Finds

By Guest PostJuly 27, 2012Sciencebrain, chronic exposure, depression, depressive disorder, depressive symptom, drug, hamster, harmful effects, hippocampus, light, light cycle, light dark cycle, night, protein, randy nelson, rodent, siberian hamsters, tnf, tnf inhibitor, tracy bedrosian, tumor necrosis factor, xpro1595, zachary weil

COLUMBUS, Ohio – Chronic exposure to dim light at night can lead to depressive symptoms in rodents – but these negative effects can be reversed simply by returning to a standard light-dark cycle, a new study suggests.

While hamsters exposed to light at night for four weeks showed evidence of depressive symptoms, those symptoms essentially disappeared after about two weeks if they returned to normal lighting conditions.

Even changes in the brain that occurred after hamsters lived with chronic light at night reversed themselves after returning to a more normal light cycle. (more…)

Sexual Orientation Fluctuation Correlated to Alcohol Misuse, MU Researcher Finds

By Guest PostJune 16, 2012Culture, Healthalcohol use, amelia talley, anxiety, bisexuals, depression, heterosexual, homosexual, risky behaviors, sexual behavior, sexual identity, sexual minorities, sexual orientation, sexual self definition, stress, university of missouri

Understanding this phenomenon could improve psychological support systems for sexual minorities and help young people avoid alcohol problems.

COLUMBIA, Mo. — Many young adults explore and define their sexual identity in college, but that process can be stressful and lead to risky behaviors. In a new study, students whose sexual self-definition didn’t fall into exclusively heterosexual or homosexual categories tended to misuse alcohol more frequently than people who had a firmly defined sexual orientation for a particular gender, according to University of Missouri researchers. These findings could be used to improve support programs for sexual minorities.

“Bisexuals and students whose sexual orientation was in flux reported the heaviest drinking and most negative consequences from alcohol use, such as uncontrolled drinking and withdrawal symptoms,” said Amelia Talley, MU assistant professor of psychological sciences in the College of Arts and Science. “Those groups reported drinking to relieve anxiety and depression at higher rates than strictly heterosexual or homosexual individuals. One possible explanation is that people who aren’t either completely heterosexual or homosexual may feel stigmatized by both groups.” (more…)

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