The goal of this observational study is to determine the effects of cervical hyperextension on cerebral oximetry and cognitive functions in healthy individuals without other additional factors such as anesthesia and surgical stress. The main questions it aims to answer are: * Can cervical hyperextension cause changes in cerebral oxygenation in non-anesthetized healthy individuals? * Can cervical hyperextension cause changes in cervical and cerebral blood flow in non-anesthetized healthy individuals? * Can cervical hyperextension cause changes in cognitive functions in non-anesthetized healthy individuals? * Can cervical hyperextension cause changes in optic nerve sheath diameter in non-anesthetized healthy individuals? Participants will be monitored with cerebral oximeter device and asked to answer Montreal cognitive function test before and during cervical hyperextension position. The researchers will evaluate the changes in cervical and cerebral blood flow ultrasonographically before and during cervical hyperextension position.
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Change from baseline in the cervical blood flow rates
Timeframe: Cervical blood flow measurement will be performed 3 times in 30 minute period.
Change from baseline in the optic nerve sheath diameter
Timeframe: Optic nerve sheath diameter measurement will be performed 3 times in 30 minute period.
Change from baseline in the cerebral oximeter values
Timeframe: Cerebral oxygenisation values will be measured continuously before and during the cervical hyperextension position and recorded in every 5 minutes in 30 minute period.
Change from baseline in the Montreal cognitive assessment test
Timeframe: Montreal cognitive assessment test will be performed 2 times in 30 minute period.