The list must contain the following elements.x coordinate of the center of stimulus in degrees
relative to fixation
y coordinate of the center of stimulus in degrees
relative to fixation
image an image to display in a machine specific format
level stimulus level in cd/$\mbox{m}^2$ (ignored if !is.na(image))
size diameter of target in degrees, or scaling factor for
image if specified
color machine specific stimulus color settings
(ignored if !is.na(image))
duration total stimulus duration in milliseconds maximum
responseWindow time (>= 0) in milliseconds to wait for a response from
the onset of the stimulus presentation
... machine specific parameters
SimHenson and SimGaussian{
Only level is used.
Duration and location are ignored, color is assumed "white"
and size is assumed to be 26/60 (Goldmann III).
}
Octopus 900{
x and y are in degrees, with precision to one decimal place recognised.
image is not possible on an Octopus 900.
level is in cd/$\mbox{m}^2$, and is rounded to the
nearest one tenth of a dB for display.
color is ignored. Use opiSetBackground() to alter stimulus color.
}