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Move Retinal Position:
Retinal region that you
Control
can be
your
stimulated.
virtual electrode here. The grid allows you
Allows you to view Unlike
different
other
regions
simulation,
of the
to select
retina.
the receptive
the cortical
field
column being studied. The descend
Location refers to the
Might
center
not of
bescreen
in this in
area.
button
arbitrary
moves
units
the electrode deeper into the cortex.
Select your stimulus here
Control parameters of the stimulus here
The firing rate of the cell is shown here
Viewing Different Areas of the Retina
The position of the center of the screen on the fovea is
indicated here. The units are arbitrary. Think of them as mm.
The position 0,0 indicates the fovea.
Move Retinal Position:
The red arrows will move in the indicated direction
¼ the visible area in that direction.
That is, if the center is 0 and the right edge is 50,
one click on the right red arrow will put the center
at 25. It is the same proportion, not absolute movement
for the vertical arrows.
Controlling
the
Stimulus
You can move your stimulus across the visible retinal area by either
Select your stimulus
here.your mouse over the area or using the sliders along the sides.
dragging
With these controls
you can change the
bar or dot width,
the bar tilt (orientation)
through -90 to +90 deg,
and put the stimulus
in the center of the
visible retina. If the
moving bar is used, you
can reverse the
direction of motion.
If present, there is a
checkbox you can
select to show the
receptive field.
Output of the Cell
Cell’s output. Think of the value as being number of action
potentials a second.
Controlling the Electrode
Current Position of Electrode:
Pressing
this
button
allow you
Recall that
the
cortexwill
is divided
intoto record
from
a cell
deeperThe
in the
cortex.
can
vertical
columns.
lateral
and You
vertical
record
25 current
cells in any
column.
positionfrom
is the
column
beingOnce
astudied
cell hasrelative
been left
it cannot
be accessed
to the
first column.
The again
first
is the left
edge ofa the
Striate
Eachcolumn
white square
represent
different
cortex,
vertically.
will be
the to
columncentered
on the cortex.
ClickThis
on that
square
fovea.
You can from
only move
to the starting
right butwith
start recording
that cortex,
both
and down.
The depth
is the
a cell up
nearest
the surface.
When
you select a
distance
fromcolumn
the surface
in grayed
numberout.
of Once
column, that
will be
cells
recorded
from.you cannot again record
you leave
a column
from that column again.
This control will allow you to select a new region of brain whose column you wish to
record from. Initially you can move up, down, and to the right. Once you have left
a brain region, you cannot return and record from any other cells in that region.