Date of Publication: 30-Nov--0001
CRITICAL FUSION FREQUENCY AND AUDIO-VISUAL REACTION TIME AS A FUNCTION OF AGE
Author: BHUTKAR P.M., BHUTKAR M.V, MARUTHY K.N.
Background: Aging in humans is a multidimensional process. One of the changes commonly seen in elderly persons is slowness of the movements. Correct and timely response to the auditory and visual stimuli is necessary in day to day life situation. Critical fusion frequency is the frequency at which an intermittent light stimulus appears to be completely steady to the observer.
Aims and Objectives: To study changes in auditory and visual reaction time and critical fusion frequency in healthy subjects of various age groups and to investigate the relationship between reaction time and critical fusion frequency.
Material and Methods: Study was conducted on healthy individuals of age between 20 to 70 years. Auditory and visual reaction time was measured by the audio-visual reaction time apparatus. CFF was measured by a portable software-based apparatus.
Statistical analysis: Data was analyzed statistically by using one way ANOVA for group wise changes in RT and CFF. Relationship between visual RT and CFF was found out by Pearson's coefficient of correlation.
Results and Conclusion: From the present study it can be concluded that the RT increases and CFF decreases with age. These changes are similar in both male and female subjects. As CFF is negatively correlated with RT and also the age, it can be the reason for changes in RT as age advances.
Keywords: Auditory reaction time, visual reaction time, critical fusion frequency, old age