Seniors Almost Twice as Likely to Have Memories
Affected By Environmental Distraction
‘Almost any type of memory test administered reveals
a decline in memory from the age of 25 on’
14, 2014 - Seniors are nearly twice as likely as younger people to have
their memory and cognitive processes impaired by environmental
distractions (such as irrelevant speech or written words presented along
with target stimuli), according to a new study from psychologists at
Rice University and Johns Hopkins University School of Medicine.
Whereas other studies had found that older adults
are distracted by memories of prior similar events, this was the first
study to convincingly demonstrate across several tasks impairment from
“Cognitive Declines in Healthy Aging: Evidence
from Multiple Aspects of Interference Resolution” appeared in a recent
edition of Psychology and Aging.
The study 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 seniors between the ages of 64 and
82 (average age of 71) who participated in a series of memory and
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 Elma W. Schneider Professor of Psychology at Rice and the study’s
“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
“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.”
The study’s lead author was Corinne Pettigrew, a
former graduate student in psychology at Rice who is currently a
postdoctoral fellow in the Division of Cognitive Neuroscience in the
Department of Neurology at Johns Hopkins University School of Medicine.
The study was funded by the Gertrude Maurin Fund
and the Social Sciences Research Institute at Rice University, Houston,
Texas, and is available online at
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