PSYC 212 Chapter 3: PSYC 212 - Chapter 3

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Sensaions arise from receptors distributed throughout enire body rather than discrete sensory organs (like other senses) Propriocepion: specialized receptors within muscles/joints, allows us to be aware of locaion of our limbs in space: neural basis of somatosensory percepion. Theory of receptor speciicity: each type of receptor produces paricular touch sensaion and indicates where on skin surface the simulaion occurred. Patern theory: speciicity of touch sensaions arises from overall patern of acivity across broad spectrum of receptors. Touch signals are highly speciic/selecively generated by special receptors: mechanoreceptors: the skin and its receptors. Dermis: makes up bulk of issue, contains mechanoreceptors. There are 3: encapsulated receptors: have specialized capsule surrounding nerve ending. Ruini corpuscles: transmit steady pressure sensaions: receptors with accessory structures. Merkel disc: detects light touch to skin: free nerve endings. Simulus applied to skin pressure transmited to receptor, strain opens na+ channels.

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