The aging process is often associated with wisdom although some capabilities, such as memory, can be a challenge.
New research finds that environmental factors — such as an irrelevant speck or written words — are twice as likely to impair the memory of an older person as that of younger individuals.
In the study, psychologists at Rice University and Johns Hopkins University School of Medicine also confirmed early investigations that found older adults are distracted by memories of prior similar events.
However, this was the first study to convincingly demonstrate across several tasks an impairment from environmental distractions.
The study appeared in a recent edition of Psychology and Aging. It supported previous research that showed memory accuracy and the speed of cognitive processing declines with age.
It also revealed that older people were at least twice as likely as younger to have irrelevant memories intrude during memory recall and also showed twice as much slowing in cognitive processing in the presence of distracting information in the environment.
The study included 102 people between the ages of 18 and 32 (average age of 21) and 60 people between the ages of 64 and 82 (average age of 71) who participated in a series of memory and cognitive tasks.
For example, when the participants were tested on remembering lists of words, individuals in the young test group remembered words on the list with an average accuracy of 81 percent; in comparison, the old test group’s accuracy was only 67 percent.
When irrelevant words were introduced that were to be ignored, the young test group’s accuracy dropped to 74 percent, but the accuracy of the old test group’s performance dropped to 46 percent.
“Almost any type of memory test administered reveals a decline in memory from the age of 25 on,” said Randi Martin, the study’s co-author.
“However, this is the first study to convincingly demonstrate the impact of environmental interference on processing having a greater impact on older than younger adults.”
Martin hopes that the research will encourage further research of how the brain is affected by environmental distractions.
“From our perspective of studying neuroplasticity (the brain’s ability to reorganize itself after traumatic injury or neurological disorders) and testing patients with brain damage, this research is very important,” Martin said.
“The tests used in this study are important tools in determining how the brain is affected by environmental interference, which is critical information in treating neurological disorders, including stroke and traumatic brain injuries.”
Source: Rice University