Principles of sensory systems Flashcards
what is labelled line code
that there are specific sensory receptors and neuronal pathways for each modality
what are four coding requirements of sensory systems
identify the modality
amplitude
temporal
spatial
what are broadmanns cortex areas
1,2,3=primary somatosensory
17=primary visual
41,42=primary auditory
43= primary gustatory
describe ion channels for mechanoception
they are stretch sensitive
what happens when olfactory g coupled receptors are activated by odorant molecules
trigger second messenger cascade leading to increase in cyclic amp which gates an ion channel
what is AD conversion
many sensory neurons function as analogue to digital converters
dynamic and static properties
what are slow adapting receptors
respond to prolonged or constant stimulation, signalling stimulus strength for minutes
what are fast adapting receptors
cease firing during constant stimulation
fire at beginning and end of stimulus
describe pacinian corpuscles
rapidly inactivating mechanoreceptor
sense deep pressure touch, high frequency vibration, high velocity changes in joint position
what is goldman equation principle
membrane potential is proportional to log funciton
what is functional heirarchy
relay neurons pre process sensory information
what is convergent excitation
receptive field of second order neuron made up on many RFs of first order neurons
what is used for edge detection
lateral inhibition
what are the touch and pain pathways
dorsal column medial lemniscal pathway
spinothalamic pathway
