Touch - 12 12 Introduction Touch Chapter 12 Touch Touch...

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12 Touch Chapter 12 12 Touch • Introduction • Touch Physiology • Tactile Sensitivity and Acuity • Haptic Perception 12 Introduction Proprioception: Perception mediated by kinesthetic and vestibular receptors. Somatosensation: A collective term for sensory signals from the body.
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12 Touch Physiology Touch receptors: Embedded on outer layer (epidermis) and underlying layer (dermis) – Multiple types of touch receptors – Each touch receptors has three attributes: 1. Type of stimulation the receptor responds to. 2. Size of the receptive field. 3. Rate of adaptation. 12 The Four Types of Mechanoreceptors 12 Touch Physiology Tactile receptors (four): Mechanoreceptors- respond to mechanical stimulation or pressure. – Meissner corpuscles. – Merkel cell neutrite complexes. – Pacinian corpuscles. – Ruffini endings.
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12 Mechanoreceptors 12 Touch Physiology Each receptor: different range of responsiveness 12 Touch Physiology Other types of mechanoreceptors within muscles, tendons, and joints: – Kinesthetic receptors: Play important role in sense of where limbs are, what kinds of movements are made.
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12 Touch Physiology Spindles: Convey the rate at which the muscle fibers are changing in length – Receptors in tendons provide signals about tension in muscles attached to tendons. – Receptors in joints react when joint is bent to an extreme angle. 12 Muscle Spindle 12 Touch Physiology Importance of kinesthetic receptors: – Strange case of neurological patient Ian Waterman. – Cutaneous nerves connecting Waterman’s kinesthetic mechanoreceptors to brain destroyed by viral infection. – Lacked kinesthetic senses, dependent on vision to tell limb positions.
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12 Touch Physiology Thermoreceptors: – Sensory receptors that signal information about changes in skin temperature. – Two distinct populations of thermoreceptors: warmth fibers, cold fibers. – Body is consistently regulating internal temperature. – Thermoreceptors kick into gear when you make contact with object warmer or colder than your skin. 12
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This note was uploaded on 03/09/2010 for the course PSY 4283 taught by Professor Ahmad during the Fall '09 term at Henderson.

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Touch - 12 12 Introduction Touch Chapter 12 Touch Touch...

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