Common Principles of Sensory & Motor System Flashcards
Receptor potentials are typically ____ potentials, similar to synaptic potentials.
Graded
Receptor Potentials are converted into _____for Transmission to CNS
Rate Codes
What type of channels underlie several sensory responses?
Cation P-loop channels
In most cases, receptor adaptation to a sustained stimulus is a ____-regulated process
Ca2+
In the presence of weak stimuli, receptor is in its most _____ state
In the presence of stronger stimuli, receptor is adapted to respond only to _____ stimulus variations
sensitive
bigger
Give an example of a sensation we interpret from labeled lines.
Hot sensation of capsaicin
In many systems, the receptor is not a channel. Instead, the receptor does what?
Metabolically regulates the transduction channel
What leads to distinct information being sent to the CNS even though the same receptor potential generating channel is used for all stimuli?
differential expression of receptors
How does the brain detect different tastes?
Different neurons carry the different taste signals into the brain allowing the same transduction scheme to transmit distinct taste information
What is receptive field? Positive, negative, or both stimuli?
Set of stimuli that affect the firing of a sensory neuron
Both positive and negative
Stimuli that are focused on the ____ area of the receptive field are detected more strongly than stimuli that are _____ across the receptive field
positive
constant
What helps sharpen the info coming into the CNS?
Antagonistic field organization
Receptive field size is typically _____ related to how critical the information is for the animals survival
Inversely
Ex: Visual receptive fields are large in the periphery, but small in the fovea
T or F: Sensory pathways never cross over in CNS.
FALSE - most do
Where in the brain does sensory info enter?
cortex
