Intro To Sensory Flashcards
Stimulus processing is usually_____ where is processing is usually____
Conscious And subconscious
What is proprioception
Knowing where your body is in space
Chemo receptors, what might they respond to
Oxygen change, pH change, various organic molecules such as glucose
Give examples of mechanoreceptors
Pressure (BP = baroreceptors), cell stretch (osmoreceptors), vibration, acceleration, sound
Photo receptors respond to
Photons of light
Thermo receptors respond to
Varying degrees of heat
A stimulus is converted into a graded potential via
Sensory transduction
What is sensory transduction
Convert a stimulus into a change in membrane potential
Adequate stimulus
A form of energy to which a sensory receptors most responsive
Receptor potential
A graded potential but it’s in the sensory receptor
Threshold
The minimum stimulus required to activate a receptor
In order for sensory neurons to respond to a stimulus, that stimulus must fall within a specific physical area called
The receptive field which is the area that a stimulus needs to be present to be noticed
Bev to stimulus is our very close together they may
Filter into one neuron and only send one signal to the brain instead of two
True or false? The primary sensory neurons converge on one secondary sensory neuron and information from only one secondary neuron goes to the brain? Can this happen?
True, yes it can
Why is the sensory pathway for olfaction different?
Most sensory pathways go through the thalamus but the old factory pathway starts at the nose goes to the old factory bulb and then to the old factory cortex
What is the function of the thalamus
The salmon is modified some relays information to specific cortical centres or areas of the brain
What does equilibrium effect and where does it’s pathway project to?
It can affect balance so when drinking GABA is increase to the cerebellum which is where equilibrium pathway projects to
What are four important properties of stimuli and define them
Modality: is the nature of the stimuli so each receptor is most responsive to one modality or type of stimulus. Location: which receptive fields are activated. Intensity: determined by the number of receptors activated and the frequency of action potential’s. Duration: how long the receptors are activated
Talk about lateral inhibition and location
Pathway closest to the stimulus inhibits its neighbours To allow for a clear signal going to the brain and enhancement of the perception of the stimulus
What happens if intensity and duration are high
There’s a higher frequency of action potential is generated some more neurotransmitters are being released
Tonic receptors
Slowly adapting receptors that respond for the duration of a stimulus
Phasic receptors
Rapidly adapt to a constant stimulus and turn off
How does adaptation work in tonic receptors
It keeps responding and tends to respond for the whole duration like when you touch something hot. The number of action potentials is constant and the receptor potential doesn’t get back down in the image
How does phasic receptors work with adaptation
They rapidly adapt a constant simulators and turn off so a lot of this would be like when you’re sitting on a chair or your shoes on your feet
