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Lec03_VisionIntro_Chap2

Lec03_VisionIntro_Chap2 - Intro to Light Vision Jonathan...

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Intro to Light & Vision Jonathan Pillow Perception (PSY 323), Fall 2009 Lec. 3 The University of Texas at Austin
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Brief Neuroscience Intro But first:
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the brain, yo
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neuron dendrites of target neurons axons of sensory receptor neurons
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perception - alan stocker © 2009 spikes - currency of the nervous system depolarization: Na+ enters action potential! repolarization: K+ flows out hodgkin and huxley
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spike propagation
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synapse action potential triggers release of vesicles transmitter molecules bind to receptor post-synaptic electrical signal
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measuring neural activity • Invasive methods - electrophysiology (electrodes) - imaging (voltage sensitive dyes) • non-invasive methods - fMRI (functional magnetic resonance imaging) - EEG (electroencephalography) - MEG (magnetoencephalography)
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Chapter 2: First steps in Vision
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Light: A wave; a stream of photons, tiny particles that each consist of one quantum of energy Light : electromagnetic radiation within a narrow energy range • a wave: can be bent by lenses • a particle: “photons” - can travel through a vacuum, have minimum energy that can be emitted/absorbed (quanta)
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