Class Notes (835,600)
Canada (509,275)
Psychology (2,094)
PSYC 309 (42)
Todd Handy (35)
Lecture 3

PSYCH 309 - Lecture 3 (Body Representation) - Sept 12.docx

6 Pages
Unlock Document

PSYC 309
Todd Handy

September 12, 2013 – Lecture 3 – Body Representation Readings: Primal,Acute and Easily Duped: Our Sense of Touch • 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
More Less

Related notes for PSYC 309

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.