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Lecture 3

PSYCH 309 - Lecture 3 (Body Representation) - Sept 12.docx
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Department
Psychology
Course
PSYC 309
Professor
Todd Handy
Semester
Fall

Description
September 12, 2013 – Lecture 3 – Body Representation Readings: Primal,Acute and Easily Duped: Our Sense of Touch http://www.nytimes.com/2008/12/09/science/09angi.html?_r=0 • human finger is so sensitive it can detect a surface bump just one micron high. • Haptics – ‘touch’, e.g. practical purposes such as building touch screens • Touch – most active sense, learn about something tactilely – make a move (pet a cat, etc ) o Widespread – receptors scattered throughout skin and muscle tissue, convey signals by spinal cord  Sight, vision, smell, taste all together in the head o Touch related receptors: mechanoreceptors (pressure + vibrations), thermal receptors (sense warmth or cold), kinesthetic receptors (where limbs are), pain receptors • Tactile illusions require collusion of other senses o Parchment skin illusion – rub hands together while listening to high-frequency sounds – palms feel exceptionally dry and papery An illusion you can sink your teeth into: Haptic cues modulate the perceived freshness sand crispness of pretzels • Food perception: the way food looks, sound, feel like in the mouth • Results demonstrate that the perception of both freshness and crispness was systematically altered when incongruent information was provided o Bit fresh pretzel – perceived as staler and softer when stale pretzel was held in hand • Goal: modify perceived textural attributes of pretzels received by mouth by modifying textural attributes presented to the hand o Perception of food and drink properties can be changed by manipulating other sensory cues associated with them How is the Body Represented? • Somatosensory cortex or “strip” o Different parts of the strip represent different parts of the body o Every part on the body surface has a corresponding point on the body map o Left part in brain = right side of body, vice versa • Somatosensory “homoculus” Phantom Limbs • In the brain – complete map of the body; body constructed in the mind • Perceptual consequences genetically programmed to give you a sense of your body o How our bodies are represented in the brain • Feel like body part is there even though it isn’t there Video: • After amputation surgery – felt arm was there, but it is not o Shaving left side of face -> pain in phantom arm o Stroke on 1 part of the body of amputation led patient to feel stroke on phantom limb o Neuropathways were re-wired after amputation • Right side of body is represented on left side of brain, corresponding point for face, hand, etc. o Sensory area (homoculus) for face is right beside arm • Sensory signal to face in the brain activates missing hand region; misinterpret signal and stimulate area of face and arm • Can have a phantom part of any part of body – except brain • How to treat pain in arm that doesn’t exist? Iclicker: Which hypothesis explains how face can innervate the hand area of brain in a phantom limb patient? • There is a dendritic reorganization in the thala
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