Sensation & Perception

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Smell Like taste, smell is a chemical sense. Odorants enter the nasal cavity to stimulate 5 million receptors to sense smell. Unlike taste, there are many different forms of smell. Smell and Memories The brain region for smell (in red) is closely connected with the brain regions involved with memory (limbic system). That is why strong memories are made through the sense of smell. Pheromones, Odor, and Sweaty T-Shirts • http://www.pbs.org/wgbh/evolution/library/ 01/6/l_016_08.html 31 33 Age, Gender, and Smell Ability to identify smell peaks during early adulthood, but steadily declines after that. Women are better at detecting odors than men. Example of Sensory Interaction Audition/Vision Count the Fs: FINISHED FILES ARE THE RESULTS OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS. • Adaptive to prefer mate with different immune system to one’s own: MHC (major histocompatibility locus) • Women preferred the scents of T-shirts worn by men whose MHC Vision genes were different from their own. 35 36 32 34 6
Transduction In sensation, the transformation of stimulus energy into neural impulses. Phototransduction: Conversion of light energy into neural impulses that the brain can understand. Light Characteristics � Wavelength (hue/color) � Intensity (brightness) � Saturation (purity) Wavelength (Hue) Violet Indigo Blue Green Yellow Orange Red 400 nm 700 nm Long wavelengths Short wavelengths Different wavelengths of light result in different colors. 37 39 41 Both Photos: Thomas Eisner The Stimulus Input: Light Energy Hue (color) is the dimension of color determined by the wavelength of the light. Wavelength is the distance from the peak of one wave to the peak of the next. Intensity Amount of energy in a wave determined by the amplitude. It is related to perceived brightness. Wavelength (Hue) Intensity (Brightness) Visible Spectrum 38 40 42 7
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