sensory physiology Flashcards
what is modality and quality for sensory system
what is being sensed
examples of Modality and quality
Vision Audition Balance Somatosensation Taste Olfaction Visceral
what are the submodalities of somatosensation
Pressure
Pain
Temp
what are the submodalities of taste
Sweet sour bitter salty Umami
what is the intensity of a sensation
how much
what is the lcoation of a sensation
where
what is the duration of a sensation
When
are all stimulus the same importance for each sesnory system
No
where do unique expereinces associated with a particular modality begin
at the receptor
what is the initial interaction of a stimulus with a receptor
transduction
what is transduction
transformation of a physical energy into a neural signal
the type of energy that a given receptor type is most sensitive to
adequate stimulus
the stimulation site that elicit neural response
Receptive field
types of thresholds
neural threshold
Perceptual threshold
neural threshold
the amount needed to depolarizae a neuron
preceptual threshold
absolute, difference
- how much it takes for one to notice
law of specific nerve energyeis
Central connection determine modality
i.e. stimulation of optic nerve bypassing receptors mean light
relates physical properiteis of stimulus to sensation
Psychophyscs
what types of sesnations have sensory receptors on the primary afferent neuron
Somatosensory (mechanoreceptors, thermoreceeptors, chemoreceptors, nociceptors)
Olfaction (chemoreceptors)
what types of sensations have sensory receptors on a recetpor cell that comunicates with the primary afferent neuron
Vision (photoreceptors)
Audition (mechanoreceptors)
Balance (mechanoreceptors)
Taste (Chemoreceptors)
what is a physical (direct) interaction of a stimulus
what interaction with membrane preotein opens ion channels
what senations do physical (direct) interaction
somatosensory
Vestibuluar
Auditory
taste
what is a molecular interaction with a stiulus
interactions with a membran protein (G-protein)
what sensations do molecular interaction
vision
taste
olfaction
how does direction transduction occure in the taste system
- Na+ enters through ENaCs(epithelial Na+ channels): depolarization of cell
- Action potential leads to Ca++ entry
- Release of ATP as neurotransmitter (not stored in vesicles)
what mechanoreceptors are used in direct transduction pathways
Piezo1 and piezo 2
what are piezo1 and piezo2
A unique family of large + transmembrane segments for direct transduction
key evidence of piezo 1 and piezo2
Dorsal Root Ganglion cell
Response to pressure
Knockouts show reduced response