Sensation & Perception

Sensation & Perception - Lecture 5: Sensation &...

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1 Lecture 5: Neurons Review Sensory Inter-neurons Motor How does information get in? Our senses Sensory Cortex Smell Taste Brain works in action potentials. Stimulus Becomes an Action Potential Transduction Physical energy signals (stimulus) Electrical energy signals (action potentials) Receptors specific to each sense Vision: photoreceptors
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2 Sensation Stimulation of a sense organ Receptors detect and respond to external stimulus No meaning on their own Perception Organization and interpretation of sensory signals that lead to mental representation of stimulus The brain! Vision Electromagnetic Spectrum Light Properties of Light Waves Qualitative coding Different receptors activated Quantitative coding Rate of action potentials vs. Anatomy of the Eye Blind spot (Demo p.134)
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3 The Retina Light Neural Message Photoreceptors Transduction Photoreceptors connect to ganglion cells Ganglion cell axons = Optic nerve Photoreceptors Rods Cones Fovea Area of the retina with sharpest vision Photoreceptors: Rods Light sensitive Dim light vision No color Periphery of retina Photopigment Rhodopsin Breaks down during transduction Photoreceptors: Cones Color sensitive Need bright light Fine detail vision Fovea Photopigment Iodopsin 3 Types Short Wavelength Medium Wavelength Long Wavelength
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4 Color Perception Trichromacy Theory Pattern of activation of 3 cone types determines perceived color (hue)
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Sensation & Perception - Lecture 5: Sensation &...

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