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Full-Text Articles in Biomedical Engineering and Bioengineering
Influence Of Tissue Absorption And Scattering On Diffuse Correlation Spectroscopy Blood Flow Measurements, Daniel Irwin
Influence Of Tissue Absorption And Scattering On Diffuse Correlation Spectroscopy Blood Flow Measurements, Daniel Irwin
University of Kentucky Master's Theses
This investigation evaluates the influences of optical property assumptions on nearinfrared diffuse correlation spectroscopy (DCS) flow index measurements. Independent variation is induced in optical properties, absorption coefficient (μa) and reduced scattering coefficient (μs’), of liquid phantoms with concurrent measurements of flow indices. A hybrid instrument is incorporated consisting of a dual-wavelength (785 and 830 nm) DCS flow device to obtain flow indices and a frequency-domain tissue-oximeter for optical properties. Flow indices are calculated with measured μa and μs’ or assumed constant μa and μs’. Inaccurate μs’ assumptions produced …
The Effect Of Practice On Eye Movements In The 1/D Paradigm, Will Seidelman
The Effect Of Practice On Eye Movements In The 1/D Paradigm, Will Seidelman
University of Kentucky Master's Theses
Previous studies have demonstrated that observers may ignore highly salient feature singletons during a conjunction search task through focusing the attentional window (Belopolsky, Zwaan, Theeuwes, & Kramer, 2007), or by the suppression of bottom-up information (Treisman & Sato, 1990). In the current study, observers’ eye movements were monitored while performing a search task in which a feature singleton was present and corresponded with the target at a chance level. With practice, observers were less likely to make an initial saccade toward the singleton item, but initial saccades directed at the target were likely throughout. Results demonstrate that, in an effort …