Featured Research

from universities, journals, and other organizations

Why is late-life depression harder to treat?

Date:
May 10, 2010
Source:
Baycrest Centre for Geriatric Care
Summary:
Scientists have found an important clue in the quest to understand why people who suffer from depression in later life are harder to treat and keep well in the long term. According to a new study, older adults with depression don't respond normally to emotional stimuli, such as when they see happy, sad or neutral faces.

Scientists have found an important clue in the quest to understand why people who suffer from depression in later life are harder to treat and keep well in the long term.

A study led by Toronto's Baycrest has found that older adults with depression don't respond normally to emotional stimuli, such as when they see happy, sad or neutral faces.

The study appears online in the American Journal of Geriatric Psychiatry and is likely the first published data to focus specifically on emotional processing in un-medicated older adults with late-life depression.

"In our study we found significant differences between older depressed subjects and older healthy subjects in how they emotionally respond to and perceive facial expressions," said principal investigator Dr. Linda Mah, a clinician-scientist in the Mood Clinic at Baycrest.

Emotion dysregulation is already well established in mid-life depression and some studies have shown it to be predictive of a relapse of mood symptoms. But the majority of late-life depression studies have concentrated on the link with cognitive decline, suggesting that the more impaired the cognitive functions the greater the chances of a poor prognosis in depression.

"Our data suggest that we need to also focus on emotion to better understand the neurobiology of late-life depression, so we can treat it more effectively and help people feel better longer," said Dr. Mah.

In the study, 11 un-medicated outpatients with major depressive disorder, and 11 healthy comparison subjects, participated in two tasks that involved looking at photographs of faces with happy, sad, fearful or neutral expressions. The age range of participants was 60 to 87.

In the first task, participants were asked to make judgments regarding a physical feature of faces, rather than judging the emotional expression. In the second task, participants were asked to label the emotional expressions on faces.

The study found that healthy controls were 16% slower in making judgments about physical features of the faces with positive or negative emotional expressions (happy, sad, fearful) relative to neutral faces -- an indication that they were distracted or affected by the emotional expressions on faces. The depressed participants showed no differences in response time to rating physical aspects of faces with emotional expressions or neutral faces. This suggests they were less sensitive to the effects of positive or negative emotional expressions.

In the second task, depressed participants had greater than 60% more difficulty with correctly labeling neutral faces, compared to healthy subjects. Depressed participants misread neutral expressions as happy, sad or fearful.

Dr. Mah noted that an impaired ability to read other people's emotional expressions can have social consequences and affect the quality of social interactions with others.

She also pointed out that these abnormalities in emotional processing seen in older depressed adults are distinct from those already reported in younger depressed adults who tend to perceive and process emotional stimuli more negatively overall when compared to healthy subjects.

The Baycrest study included small sample sizes, so the results should be considered preliminary. Efforts are ongoing to recruit older patients who are currently not on antidepressant medications, and to use functional neuroimaging to pinpoint the brain changes underlying the abnormalities in emotional processing that appear to be associated with late-life depression.

In addition to her psychiatric practice at Baycrest's Mood Clinic, Dr. Mah is a clinician scientist at Baycrest's Rotman Research Institute as well as the Kunin-Lunenfeld Applied Research Unit. She is also an assistant professor of Psychiatry, in the Division of Geriatric Psychiatry, at the University of Toronto.

Dr. Bruce Pollock, the Sandra A. Rotman Chair in Neuropsychiatry at Baycrest and the University of Toronto, assisted in this research. Dr. Pollock is vice-president of Research at CAMH, Chair of the Division of Geriatric Psychiatry at U of T, and an internationally-renowned expert on the effects of drugs on mood and behavioural disturbances in dementia.

The Baycrest study was funded by the Geoffrey H. Wood Foundation, the University of Toronto's Dean Fund, the National Institute of Health, and the Sandra A. Rotman Chair in Neuropsychiatry.


Story Source:

The above story is based on materials provided by Baycrest Centre for Geriatric Care. Note: Materials may be edited for content and length.


Journal Reference:

  1. Mah, Linda; Pollock, Bruce G. Emotional Processing Deficits in Late-Life Depression. American Journal of Geriatric Psychiatry, 2010; DOI: 10.1097/JGP.0b013e3181d6b762

Cite This Page:

Baycrest Centre for Geriatric Care. "Why is late-life depression harder to treat?." ScienceDaily. ScienceDaily, 10 May 2010. <www.sciencedaily.com/releases/2010/05/100504102122.htm>.
Baycrest Centre for Geriatric Care. (2010, May 10). Why is late-life depression harder to treat?. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2010/05/100504102122.htm
Baycrest Centre for Geriatric Care. "Why is late-life depression harder to treat?." ScienceDaily. www.sciencedaily.com/releases/2010/05/100504102122.htm (accessed July 23, 2014).

Share This




More Health & Medicine News

Wednesday, July 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Idaho Boy Helps Brother With Disabilities Complete Triathlon

Idaho Boy Helps Brother With Disabilities Complete Triathlon

Newsy (July 23, 2014) An 8-year-old boy helped his younger brother, who has a rare genetic condition that's confined him to a wheelchair, finish a triathlon. Video provided by Newsy
Powered by NewsLook.com
Thousands Who Can't Afford Medical Care Flock to Free US Clinic

Thousands Who Can't Afford Medical Care Flock to Free US Clinic

AFP (July 23, 2014) America may be the world’s richest country, but in terms of healthcare, the World Health Organisation ranks it 37th. Thousands turned out for a free clinic run by "Remote Area Medical" with a visit from the Governor of Virginia. Duration: 2:40 Video provided by AFP
Powered by NewsLook.com
Stone Fruit Listeria Scare Causes Sweeping Recall

Stone Fruit Listeria Scare Causes Sweeping Recall

Newsy (July 22, 2014) The Wawona Packing Company has issued a voluntary recall on the stone fruit it distributes due to a possible Listeria outbreak. Video provided by Newsy
Powered by NewsLook.com
Huge Schizophrenia Study Finds Dozens Of New Genetic Causes

Huge Schizophrenia Study Finds Dozens Of New Genetic Causes

Newsy (July 22, 2014) The 83 new genetic markers could open dozens of new avenues for schizophrenia treatment research. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins