Temporal modulation transfer function

Shannon, R.V., Temporal modulation transfer functions in patients with cochlear implants, Journal of the Acoustical Society of America, 91(4), 1992, 2156-2164. 

Abstract— We investigated whether the eyestrain, often experienced by subjects using a video display terminal (VDT) for an extended period of time, is due to the decrease of blink rate or to the temporarily dry eyes. Thirty-seven subjects with no dry eyes but experienced eyestrain participated in a series of experiments. The 1st experiment was performed without using VDT to obtain the control data and subsequent experiments were performed with a VDT. In those experiments we established the base line for the eyestrain, increased the blink rate and supplied the eyes with eyedrops. Blink rate, visual acuity, temporal modulation transfer function and degree of severity of eyestrain were recorded before and after each experiment. The obtained results suggested that, using the VDT causes the decrease of the blink rate that in turn produces dry eyes which causes the eyestrain. 

Keyword— Blink rate. Eyestrain, Dry eye. Temporal modulation transfer function. Video display terminal. 

One can envision three types of perturbation an infinitesimally narrow light pulse (a Dirac or S-functional), a rectangular pulse (characteristic of chopped or interrupted irradiation), or periodic (usually sinusoidal) excitation. All three types of excitation and the corresponding responses have been treated on a common platform using the Laplace transform approach and transfer functions [170]. These perturbations refer to the temporal behavior adopted for the excitation light. However, classical AC impedance spectroscopy methods employing periodic potential excitation can be combined with steady state irradiation (the so-called PEIS experiment). In the extreme case, both the light intensity and potential can be modulated (at different frequencies) and the (nonlinear) response can be measured at sum and difference frequencies. The response parameters measured in all these cases are many but include... 

The capability of imaging equipment to capture and transfer an image through the system is generally dependent on the spatial and temporal frequency. The modulation transfer capability is a function of the spatial frequency and it is... 

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