TY - JOUR
T1 - Modeling upper eyelid kinematics during spontaneous and reflex blinks
AU - Malbouisson, Jorge Mario C.
AU - Messias, Andre
AU - Garcia, Denny Marcos
AU - Cechetti, Sheila de Paula
AU - Barbosa, José Carlos
AU - Cruz, Antonio Augusto Velasco
N1 - Funding Information:
This work was partially supported by CNPq and FAPESP, Brazilian Agencies.
PY - 2010/8
Y1 - 2010/8
N2 - To test a mathematical model for measuring blinking kinematics.Spontaneous and reflex blinks of 23 healthy subjects were recorded with two different temporal resolutions. A magnetic search coil was used to record 77 blinks sampled at 200. Hz and 2. kHz in 13 subjects. A video system with low temporal resolution (30. Hz) was employed to register 60 blinks of 10 other subjects. The experimental data points were fitted with a model that assumes that the upper eyelid movement can be divided into two parts: an impulsive accelerated motion followed by a damped harmonic oscillation.All spontaneous and reflex blinks, including those recorded with low resolution, were well fitted by the model with a median coefficient of determination of 0.990. No significant difference was observed when the parameters of the blinks were estimated with the under-damped or critically damped solutions of the harmonic oscillator. On the other hand, the over-damped solution was not applicable to fit any movement. There was good agreement between the model and numerical estimation of the amplitude but not of maximum velocity.Spontaneous and reflex blinks can be mathematically described as consisting of two different phases. The down-phase is mainly an accelerated movement followed by a short time that represents the initial part of the damped harmonic oscillation. The latter is entirely responsible for the up-phase of the movement. Depending on the instantaneous characteristics of each movement, the under-damped or critically damped oscillation is better suited to describe the second phase of the blink.
AB - To test a mathematical model for measuring blinking kinematics.Spontaneous and reflex blinks of 23 healthy subjects were recorded with two different temporal resolutions. A magnetic search coil was used to record 77 blinks sampled at 200. Hz and 2. kHz in 13 subjects. A video system with low temporal resolution (30. Hz) was employed to register 60 blinks of 10 other subjects. The experimental data points were fitted with a model that assumes that the upper eyelid movement can be divided into two parts: an impulsive accelerated motion followed by a damped harmonic oscillation.All spontaneous and reflex blinks, including those recorded with low resolution, were well fitted by the model with a median coefficient of determination of 0.990. No significant difference was observed when the parameters of the blinks were estimated with the under-damped or critically damped solutions of the harmonic oscillator. On the other hand, the over-damped solution was not applicable to fit any movement. There was good agreement between the model and numerical estimation of the amplitude but not of maximum velocity.Spontaneous and reflex blinks can be mathematically described as consisting of two different phases. The down-phase is mainly an accelerated movement followed by a short time that represents the initial part of the damped harmonic oscillation. The latter is entirely responsible for the up-phase of the movement. Depending on the instantaneous characteristics of each movement, the under-damped or critically damped oscillation is better suited to describe the second phase of the blink.
KW - Blink
KW - Harmonic oscillation
KW - Mathematical model
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U2 - 10.1016/j.jneumeth.2010.06.006
DO - 10.1016/j.jneumeth.2010.06.006
M3 - Article
C2 - 20547184
AN - SCOPUS:77955053270
SN - 0165-0270
VL - 191
SP - 119
EP - 125
JO - Journal of Neuroscience Methods
JF - Journal of Neuroscience Methods
IS - 1
ER -