lecture06 - electrodes to fully determine the direction and...

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BIEN 130: Bioinstrumentation L06 April 16, 2009 Hyle Park
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Questions? Go over answers to quiz
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Eye Related bioinstruments Anterior segment imaging Slit lamp
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Eye Related bioinstruments Glaucoma testing Tonometer Pressure, air burst
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Eye Related bioinstruments Retinal imaging Scanning laser ophthalmoscope
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Eye Related bioinstruments Retinal imaging Fundus photography
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Eye Related bioinstruments Retinal imaging Fundus photography
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Retina Related bioinstruments Retinal imaging Fundus photography
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Retina
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Retina Photoreceptor types Rods (Sensitive, slow) Cones (Need more light, faster, color, packed in fovea) Signals to brain Go through Horizontal cells Bipolar cells Amacrine cells Ganglion cells Axons go to brain
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Retina Optic nerve Where nerves exit the eye Means there is a blind spot Macula/fovea Area of highest density of photoreceptors
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Electrode placement With a single pair of electrodes, a projection of the voltage change can be measured Need to use multiple
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Unformatted text preview: electrodes to fully determine the direction and magnitude of the voltage change in a nerve. cos V θ = ⋅ = 1 a 1 M a M M 1 a 1 E 2 E Electroretinogram • A-wave – caused by extracellular ionic currents generated by photoreceptors during phototransduction • B-wave – corresponds to bipolar cell activity • C-wave – generated by the retinal pigment epithelium and Müller cells. Questions? Brain Electroencephalogram Electroencephalogram • Delta waves (<3Hz) – Slow wave sleep, babies • Theta (4-7Hz) – Drowsiness, children • Alpha (8-12Hz) – Relaxed (eyes closed) • Mu (8-12Hz) – Sensorimotor cortex • Beta (12-30Hz) – thinking • Gamma (26-100Hz) – Hard to detect • asdasd Related bioinstruments • Other electrical interfaces, not only for reading, but for writing – Prosthetics – Shock therapy – Brain driven computer control • http://cnettv.cnet.com/2001-1_53-50004319.html Questions?...
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This note was uploaded on 02/17/2010 for the course BIEN 130 taught by Professor Park during the Spring '10 term at UC Riverside.

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lecture06 - electrodes to fully determine the direction and...

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