Week 8B Flashcards
what afferent dos the pinnochio effect impact?
Ia
What sensory conflict arises during the pinocchio illusion
1a muscles are lengthening while cutaneous info tell us were touching our nose
Conflict - convince us nose is growing
he CNS trusting one source of sensory info over another is known as
sensory dominance
waht are the 3 raeas in the motor cortex?
pre-motor cortex, supp motor area, primary motor cortex
2 roles of premotor cortex?
selecting motor plans for voluntary moments, preparing complex tasks/movement
what are hte nuerons in the pre-motor cortex that singla preparation for movement?
motor-set neurons
what are motor set neruons and where are they found?
found in the pre-motor crotexx - singla preparation for movement “getting set”
what are the neurons active in response to sensory aspects associataed wtih motor acitons ?
mirror neurons
what do mirror neurons repsond to?
sight and sound of actions performed by others
are mirror jeurons alwayas active?
yes
2 main roles of supp motor area (SMA)
- programming complex sequences
- coordinating bi-lateral movements
true or false the SMA is based on new movements.
false - based on remeberd/previous movements
what are two things that the SMA responds to?
1/ sequence of movments
2. mental rehearsal of sequenced movements
What cortical neurons are likely responsible for a yawn
being “contagious”?
mirror neurons
does the motor homunculus represent indiviudal muscles?
no - body parts involving lots of muscles
what does the motor homunculus represent? what does it increase with?
coritcal represtnion - increased with high degrees of fine motr control/wide range of movements
the primary motor cortex relays motor commands ot the ___ via ______
alpja motor neurons via the corticospinal motor neurons
what pathway i the rpimary mtoor cortex involved in?
corticospinal pathway
when does the primary motor cortex begin firing singlas to the alpha motor enurons?
5-100ms prior to movement
what 3 thinfs does th eprimary motor cortex code for?
speed of movement
force of movement
direction of movement
what does good spatital resolution mean?
person has high accuracy in determining WHERE somehting happens
what is it called when a person has high accruacy in determining WHERE something happens ?
good spatial resolution
what is it called when a person has high accuaracy in determinign WHEN something happens
good temporal resolution
what is good temporal resoultion
high accuracy in determining WHEN somehting happens
what is it called whn electrodes are plaves all over the svalp and record the electrical actiity underneath?
EEG - electroencephalography
what is one pro and one con of EEG?
pro - excellent temporal resolution
con - poor spatial resolution
EEG has good ___ but poor ____
good temporal (when smth happens) but poor spatial (where something happens)
what does FMRI measure and compare?
blood flow within the cortex - measures and compares deoxygenated blood vs oxygenated to tell which regions of the brain are a active
fMRI has excellent ____ resoltuion but poor ___
excellent spatial (WHERE/what aprts of brain active) but poor temporal
which type of recording technique is best if we wanna determine what part of the brain is active during an acitvity ?
fMRI
what type of technique is used when we wanna selectiely examine. aspecifi region of the mortor cortex?
Transcranial magnetic stimulation (TMS)
what does TMS DO?
transcranial magnetic stimulation - stimulates certain regions of the brain and activates the msucles inn by these neurons
What motor area is activated when Brian watches chris perform tasks of juggling on tightrope
premotor- mirror neurons
as Brian prepares for his trick, he imagines the task. What
motor area is active?
SMA (supp motor area)
What motor area(s) will be activated in order
to move the muscles necessary to perform the task?
all of them
primary MC –> corticopinal neurons–> alpha MN’s
SMA –> coordinate
Premotor - prep + plan
