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

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