Physiology Of Senses Flashcards
Light
Seeing, Retina
Sound
Hearing, Ear (Corti-Organ)
Chemical
Tasting/Scenting
Tongue/ Nose
Gravity
Balance Vestibular organ (ear)
Pressure
Feeling
Skin
Temperature
Temperature sense
Warm and cold receptors
Perception threshold methods
Limiting method (one stimulus beneath threshold, the other above) Consistency method: random stimuli above/beneath threshold q
Production method
Own regulation of minimal intensity/ mean value
Weber Rule
Increase of stimulus needed to get just slightly new stronger perception E = constant fraction of initial stimulus S
Law of Fechner
Logarithmic function of association between subjectively perceives and objectively measures strength of stimulus
The stinger the stimulus the slower the next differential linen reached
Stevens Potential Law
Law of Fechner inaccurate for very strong or weak stimuli
Transduction and Transformation
Transduction: change of stimulus into sensor potential; proportional to strength and duration, depolarization if exceeding threshold.
Transformation: change of sensor potential into AP
Primary neurons/Secondary neurons
Adaption
Long stimulation duration -> decline of sensor potential.
P-sensors adapting slowly
D-sensors adapting fast
Sensory Pathways
- primary sensory neuron
- secondary neuron in SC
- neuron in sensory thalamus nucleus
- Neuron in primary sensory cortex
Tactile sense
Mechanoreceptors reacting on pressure, touch, Vibration, titillation