Submitted by: Submitted by lildaisybe3
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Category: Philosophy and Psychology
Date Submitted: 09/08/2014 10:03 PM
Chapter 9 Sensory
The Senses: Sensory receptors receive external and internal stimuli.
-Receptors transform energy of a stimulus into nerve impulses, which go to the brain for interpretation.
-Receptors: specialized portions of sensory neurons that are capable of responding to environmental stimuli and eventually converting the stimuli into action potentials.
-Impulses arriving at any particular area of the brain are interpreted in only one way, and those arriving at another brain area are interpreted differently.
Types of sensation: Somatic and Special
Somatic
Somatic: Temperature, Touch, Vibration, Pressure, Pain
-general sensation “whole body” and detected by the sensory receptors in skin and muscle that are generally spread out over the entire body
-involve receptors from more than one place in the body and may help coordinate muscle movement and maintain body temperature.
-Mechanoreceptors
-Senses we feel with our bodies, which include tough, pressure, pain and temperature and our muscle senses (proprioception).
-if you feel someone touch your arm or face that is a somatic sensation
-Free nerve endings:
*Unencapsulated:Pain. Light pressure, and temperature changes; around hairs and near the skin surface. Different sizes of nerve endings determine the modality of the receptor.
*Light touch and thermoreception
-Encapsulated
*Merkel disks (light touch): are receptors with free nerve endings that detect surface pressure. They are located deep in the epidermis.
*Pacinian corpuscles (deep pressure)
*Meissner’s corpuscles (fast adapting light touch)
*Ruffini endings (slow adapting, pressure)
Special: taste, olfaction, auditory, vestibular, vision
-Specialized organ to them
-supply us with detailed information about the world around us, including the sights, sounds, smells and tastes present in our surroundings
-the wealth of information they provide occupies most of our brain and forms the basis for our logical and...