The goal of this observational study is to compare to investigate the effect of dual task performance on straight and curved walking in elderly people with mild cognitive impairment. The main question\[s\] it aims to answer are: * The purpose of this study was to investigate the effect of dual task performance on the activity of the prefrontal cortex in the elderly with mild cognitive impairment during straight and curved walking. * The purpose of this study was to investigate the effect of dual task performance on gait speed during straight and curved walking in elderly people with mild cognitive impairment. Participants will: For mild cognitive impairment 65 and older who can do dual tasks. * single task (motor task) : an exercise task, which will perform a 10-meter walking test and a figure-eight walking test. * double task (motor task + cognitive task) : planned to perform a motor task and a cognitive task together. The cognitive task is scheduled to be a simple calculation problem so that it can be performed without great difficulty while walking.
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prefrontal cortex activity for single and dual tasks
Timeframe: through study completion, an average of 1 week.
Walking speed for single and dual tasks
Timeframe: through study completion, an average of 1 week.