8.2 Flashcards
4 aspects of somthing that can be percieved?
- Modality
- intensity
- Duration
- Location
describe what is Modality?
what kind of Receptor? Quality?
vision, hearing, taste, smell, touch, cold, warm, prpriocepption, acceleration, pain….
give an example for a labeled line?
visual pathway from the retina to the visual cortex
define the threshold?
point when the stimulus in 50% of the cases is detected and in 50% of the cases no stimulus occurs
what does the threshold depend on?
intensity of the stimulus
how can we code intensity?
- AP frequency (high f of AP -> larger intensity)
- Population coding
- Related but different type of R are activated
how can we alter the duration of a percieved sense?
by adaptation
how does the location of the stimulus can be analize?
somatotopic organization
sensory neurons are typically ______
Pseudounipolar
*Bipolar in the retina, olfactory, auditory, vestibular
cell body of the Pseudounipolar neuron located in
Dorsal root Ggl
what somatosensory R types do we have?
mechanareceptors
thermoreceptors
nociceptors
what are the two possibilities for adaptation of receptors?
- rapidly adapting
2. slowly adapting
rapidly adapting receptors mechanism
surrounded by a capsule
can only detect signal if its quickly on and off
write down somatosensory R
- Pacinian (rapidly adapting- vibration)
- Ruffini (slowly adapting- stretch)
- Meissner (rapidly adapting- touch)
- Merkel (slowly- pressure)
- Muscle spindle and Golgi Tendon Organ (stretch)
- Thermoreceptors- (slowly adapting- free nerve endings)
cold VS hot fibers?
cold- A delta fibers
hot- C fibers