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Unformatted text preview: pay
attention to 1 of 2
dimensions. So for color,
must pay attention to red
object w/ target. Then cued
to switch, the target stays
the same, but now must
response to whether the
target is in the square, so
has nothing to do w/ color
now, just the shape of the
object. Wait til you see the
target in the square. In this
you are not changing the
motor response, you are
changing the visual
dimension you have to pay
attention to. The next step was to put these patients in the scanner and localtze where these things were occurring in the brain. If you
compare these switch trials to the stay trials, and contrast the two, where are you going to see brain activity? They found
activity in the PFC, particularly in the medial dorsal regions when you have to switch vs not switching. For each individual
subject can plot where it is occurring in the brain. Now with that info, can use TMS to transiently lesion that area right after
the switch cue, and see if you can disrupt their ability to switch. The important about this, especially since this is more of a
causal design, is that you have to have sham trails (where you stimulate another part of the brain under the same
conditions to make sure you are not getting the same disruption in some other part of the brain. Typically takes them longer when they have to make a switch than when they don't have to make a switch (which is normal). But w/ the TMS, they found it took much longer when they have the
TMS on the response switch trial in the dorsomedial. Important what is happening for the control trials -- ﬁnd no difference in no-TMS vs TMS (so having no inﬂuence) for both the response
switch in the posterior midline control, and visual switch of dorsomedial. Frontal Lobes!
motor cortex! area M1. Sit anterior to the
central sulcus, strip of cortex
w/ different homunculus Just anterior to M1;
premotor planning and
action. Part of motor cortex premotor areas! doroslateral prefrontal!
lobes orbital prefrontal ! Overlap...
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This note was uploaded on 01/18/2014 for the course PSY 123 taught by Professor Staff during the Fall '11 term at UCSB.
- Fall '11