University:
MacEwan University
Course:
PSYC 258 | Cognitive Psychology
Academic year:

2024
Views:

46

Pages:

2
Author:

Arthur M.

ENVIRONMENTAL STIMULI tO SKIN SENSATIONS environmental stimuli involved in somatic senses include: Receptor Basic sKm sensation - mechanical pressure → mechanoreceptors → vibrations - chemicals - tissue damage nocio receptors → pain - temperature changes. T→ thermoreceptons → tanature Encoding touch via Mechanoreceptors • Mechanoreceprors respond to mechanical stimulation (touch, vibration or movement) • 4 different pes of mechanoreceptors m outer layer (epidermids a underlaring layer (dermis) m the okin. o Touch perception is a cocalized percept. so different mechanoreceptors responds only to a specific area of the skin called receptive field of the receptor. • All mechanoreptors nave receptive field of different sizes, different anatomy a adaption rate. SLOW ENCODING MECHANORECEPTORS (SA) - smaller receptive fields or larger receptive field size but don't adapt rapidly. so when not stimulated, they are not responding - fire as long as presuure is applied / stimulus is present. - Primary functions: • fme detail (pattern, form perception) • fexture perception • finger position - smaller REsite encode more mto from smaller area of skin than larger RF size FAST ADAPTING MECHANORECEPTORS (FA) - fire at onuet a oftset of stimulation. so when pressure starts, they rapidly adapt/ respond, but then don't respond until the pressure arsappears - proary functions: • flutter o vibrations • texture perception (when moving fingers across st.) • stable grasps.