Choice reaction time (CRT) is defined as the response to one or more stimuli. Choice reaction time is slower in older adults than simple reaction time because choice reaction time tasks are made more complicated by increasing the number of responses that a person must make. The increase in responses will disproportionally increase the reaction time (Rikli & Edwards, 1991; Lupinacci, Rikli, Jones, & Ross, 1993). When speed is not an issue, older adults demonstrate accurate performance (Haywood & Getchell, 2001). A major reason for the decrease in information processing speed seems to involve decisions based on perceptual information and programming movements (Welford, 1980). Maintaining information processing speed by older adults is necessary for daily life activities such as driving an automobile or restoring balance after a near fall (Lupinaci, Rikli, Jones, & Ross, 1993).
Research, concerning information processing speed and an active lifestyle, has shown that older adults who maintain physically active lifestyles demonstrated less slowing on reaction time tasks (Clarkson-Smith & Hartley, 1989; Baylor & Spirduso, 1988; Rikli & Edwards, 1991:Panton, Graves, Pollock, Hagberg, & Chen, 1990). It was also found that older adults with active lifestyles exhibited reaction time superior to that of older inactive adults (Baylor & Spirduso, 1988; Rikli & Edwards, 1991; Lupinacci, Rikli, Jones, & Ross, 1993).
The purpose of the present study was to assess age-related differences in the reaction time of healthy older amateur golfers between the ages of 50 and 85. The golfers played golf two to three times per week and were considered to be physically active. To determine age group differences in reaction, the time necessary to respond to each of three different finger movements were analyzed by both a simple reaction time (SRT) and a choice reaction time (CRT) task.
Procedures
All participants were assessed on two different tasks involving
information-processing
speed – SRT and CRT. The SRT and CRT were administered to each
participant,
one at a time, in a quiet area without disruptions and
distractions.
The reaction time tasks took approximately 10 minutes per
participant.
Measurement for both simple and choice reaction time were taken using
the
Lafayette Choice Reaction Time Apparatus.
Simple Reaction Time. SRT was measured by having the participants depress the middle key of the choice reaction time apparatus with the middle finger of their preferred hand in response to a visual stimuli (light). The middle light on the display panel was used in measuring SRT. Following a variable foreperiod, a stimulus light was activated. Each participant received three practice trials, followed by 10 test trials. The score was the mean of the 10 trials. All participants were given verbal knowledge of results following each trial.
Choice Reaction Time. CRT requires the participant to correctly differentiate and respond to two or more stimuli instead of one. The same procedures used for SRT were followed for CRT except that an auditory stimulus (buzzer) and a visual stimulus (light) were presented for the “one-choice” reaction time trial. The participants were told to use the middle finger of the right hand if the auditory stimulus were presented and the middle finger of the left hand if a visual stimulus were presented. The middle key on the reaction time apparatus was to be used for both type of stimuli. The participants were given four (4) trials for the “one-choice” reaction time task. Another set of four (4) trials was given for a “two-choice” reaction time. The participants were not told which key to depress. The participants, with both hands on the table, were instructed to depress the appropriate key using the middle finger of the right hand for a red light and the middle finger of the left hand for a blue light stimulus. The participants were to depress all keys until the light was turned off.
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50-60 years of age | |||
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61-70 years of age | |||
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71-85 years of age | |||
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The findings of the present study support the Stroop effect (Stroop, 1935). Basically, the Stroop effect refers to the slowing of reaction time when the ink color, in which the word is printed is incompatible with the name of the color. Interference of information processing occurs when individuals must decide which response (key) to select – the one corresponding to the name of the word (GREEN) or the one representing the ink color of the word (GREEN INK) (Schmidt & Wisberg, 2000). Spieler, Balota, and Faust (1996) used the Stroop effect to understand changes in cognitive processes of healthy older adults and individuals with dementia of the Alzheimer’s type. The results indicated that older adults have increased difficulty processing information when there is interference from irrelevant dimensions of stimuli. The present study is in agreement with Spieler, et. al. (1996) which indicated that an increased number of tasks interfered with the ability to process information with speed.
Although the sample size was small (N = 24), the
results of the present study confirm the findings of other research
(Lupinacci,
Rikli, Jones, & Ross, 1993; Spieler, Balota, & Faust, 1996;
Baylor
& Spirduso, 1988; Rikli & Edwards, 1991) who found that age
influences
speed of response to a choice reaction time task. All of the
participants
in the present study have an active lifestyle. Whether this
contributed
to the results of the study is unknown, as the researchers did not look
at activity level. Physical activity appears to be effective in
slowing
certain age-related declines in cognitive and motor performance
particularly
as measured by assessing reaction time. Older adults who are
active
maintain a fairly high level of performance on reaction time tasks.
Clarkson-Smith, L. & Hartley, A.A. (1989). Relationship between physical exercise and cognitive abilities in older adults. Psychology and Aging, 4, 183-189.
Haywood, K.M. & Getchell, N. (2001). Lifespan Motor Development. 3rd ed. Champaign, IL: Human Kinetics.
Lupinacci, N.S., Rikli, R.E., Jones, C.J., & Ross, D.
(1993).
Age and physical activity on reaction time and digit symbol
substitution
performance in cognitively active adults. Research Quarterly for
Exercise and
Sport, 64, 144-150.
Panton, L.B., Graves, J.E., Pollock, M.L., Hagberg, J.M., and Chen,
W. (1990). Effect of aerobic and resistance training on
fractionated
reaction and speed of movement. Journal
of Gerontology, 45,
M26-31.
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Rikli, R.E. & Edwards, D.J. (1991). Effects of a three-year exercise program on motor function and cognitive processing speed in older women. Research Quarterly for Exercise and Sport, 62, 61-67.
Schmidt, R.A. & Wrisberg, C.A. (2000). Motor Learning and Performance: A Problem-Based Learning Approach. 2nd ed., Champaign, IL: Human Kinetics.
Spieler, D.H., Balota, D.A., & Faust, M.E. (1996). Stroop
performance in healthy younger and older adults and individuals with
dementia
of the Alzheimer’s type. Journal
of Experimental
Psychology:
Perception and Performance, 22, 461-479.
Stroop, J.R. (1935). Studies of interference in serial verbal reactions. Journal of Experimental Psychology, 18, 643-661.
Welford, A.T. (1979). Motor skills and aging. In C.H. Nadeau, W.R. Holliwell, K.M. Newell, and G.C. Roberts (Eds), Psychology of Motor Behavior and Sports, 1979, (pp. 253-268).