New study published in the journal Brain Injury

The ability to taste and smell can be lost or impaired after a head injury, according to a new study by scientists from the Université de Montréal, the Lucie Bruneau Rehabilitation Centre, as well as the Center for Interdisciplinary Research in Rehabilitation of Greater Montreal. Published in the journal Brain Injury, the investigation established that mild to severe traumatic brain injury could cause olfactory loss.

"The study clearly demonstrates that olfactory deficits can occur in mild traumatic brain injury patients as well as in moderate and severe TBI patients," says study co-author and neuropsychologist Maurice Ptito, a professor at the Université de Montréal School of Optometry. "We also found that patients with a frontal lesion were more likely to show olfactory dysfunctions."

The research team recruited 49 people with TBI (73 percent male with a median age of 43) who completed a questionnaire and underwent two smell tests to measure their olfactory loss. The result: 55 percent of subjects had an impaired sense of smell, while 41 percent of participants were unaware of their olfactory deficit.

"Both tests indicated the same results: patients with frontal injury are more likely to suffer olfactory loss," says lead author Audrey Fortin, a professor at the Université de Montréal School of Optometry and researcher at the Lucie Bruneau Rehabilitation Centre.

Smell plays a vital role in our lives, says Dr. Fortin, since olfaction influences what we eat, can help us detect gas leaks or fires. Smell also has a huge impact on interpersonal relationships, since olfactory disorders have been associated with poor quality of life, depression, mood swings, worries about personal hygiene, loss of appetite and cooking difficulties.

"Olfactory dysfunctions have a negative impact on daily life, health and safety," says Dr. Fortin. "It is important to pay attention to this symptom once a patient's condition has been stabilized following a traumatic brain injury."

New study finds sexual minority youth bullied more than heterosexual youth

The act and victimization of bullying continues to be a problem among today's youth. While many children are experiencing this form of violence, it is more prevalent in children that are different from the social norm. As medical professionals continue to further their understanding of bullying, research shows a high rate of sexual minority youth who experience this harmful activity.

A new study conducted by doctors at Nationwide Children's Hospital found that sexual minority youth, or teens that identify themselves as gay, lesbian or bisexual, are bullied two to three times more than heterosexuals.

According to the study that is now available online in the Journal of Adolescent Health, sexual minority youth are more vulnerable to a variety of physical and mental domains such as bullying or suicidal thoughts. Plus, the study found that many older adolescents reported being bullied.

"There is a need for health care professionals, and others who work with children, to be aware that sexual minority youth are more likely to be victims of bullying and other forms of violence," said Elise Berlan, MD, lead author and physician in Adolescent Medicine at Nationwide Children's Hospital. "Parents should also take time to communicate with their children about sensitive topics such as sexuality, peer relations and violence."

Researchers examined the relationship between sexual orientation and bullying from the Growing Up Today Study (GUTS), an on-going study of American adolescents, which included information on more than 7,500 adolescents. While examining the results from the 2001 survey, the study also showed that youth identifying themselves as gay or lesbian were less likely to bully others and more likely to report being bullied than heterosexual teens.

Children that are different from the social norm often become targets of social isolation, harassment and bullying. Recommended strategies to identify this type of abusive behavior include encouraging clinicians to routinely inquire about sexual orientation and their experiences with bullying, interpersonal violence and abuse; screening sexual minority youth for depression, suicidality and involvement in high-risk behaviors; and increasing the support of school policies to ensure a safe learning environment for all students.

"Students, parents, schools and community organizations can work to create environments that are supportive and accepting of all students, regardless of their sexual orientation," said Berlan, also a faculty member at The Ohio State University College of Medicine. "Schools, in particular, need to work to increase the awareness of bullying."

Our memories are strengthened during periods of rest while we are awake, researchers at New York University have found. The findings, which appear in the latest issue of the journal Neuron, expand our understanding of how memories are boosted—previous studies had shown this process occurs during sleep, but not during times of awake rest.

"Taking a coffee break after class can actually help you retain that information you just learned," explained Lila Davachi, an assistant professor in NYU's Department of Psychology and Center for Neural Science, in whose laboratory the study was conducted. "Your brain wants you to tune out other tasks so you can tune in to what you just learned."

The study, whose lead author was Arielle Tambini, a doctoral candidate in NYU's Graduate School of Arts and Science, focused on memory consolidation—the period when a memory is stabilized after it is initially created, or encoded. To determine if memory consolidation occurred during periods of awake rest, the researchers imaged the hippocampus, a brain structure known to play a significant role in memory, and cortical regions during periods of awake rest. Previous studies have demonstrated regions of the brain more active during periods of rest, but their function at these times had been unclear.

The NYU experiment tested subjects' associative memory by showing them pairs of images containing a human face and an object (e.g., a beach ball) or a human face and a scene (e.g., a beach) followed by periods of awake rest. Subjects were not informed their memory for these images would later be tested, but, rather, were instructed to rest and simply think about anything that they wanted, but to remain awake during the resting periods. The researchers used functional magnetic resonance imaging (fMRI) to gauge activity in the hippocampus and cortical regions during the task and during the ensuing rest period.

The experiment yielded two noteworthy results. First, the researchers found that during rest after the study experience (after the visuals were shown), there was a significant correlation between brain activity in the subjects' hippocampus and cortical regions that were active during the initial encoding of each stimulus pair. However, this boost in brain correlations was only seen following experiences that were later memorable suggesting these parts of the brain act in tandem for a purpose — to consolidate memories during rest. Second, when examining each subject individually, it was found that subjects who had greater resting correlations between the hippocampus and cortex, also exhibited better performance on a subsequent associative memory test and those whose brain correlations were weaker, had worse memory — in other words, the greater the activity in hippocampus and cortical regions, the stronger the memory.

"Your brain is working for you when you're resting, so rest is important for memory and cognitive function," Davachi observed. "This is something we don't appreciate much, especially when today's information technologies keep us working round-the-clock."