OPI (version 2.10.1)

opiKineticStimulus: Stimulus parameter list

Description

List containing stimulus parameters with an S3 class attribute of opiKineticStimulus

Usage

"See details"

Details

The list should be of class opiKineticStimulus and contain the following elements.

• path list of (x,y) coordinates in degrees that is usable by xy.coords()

• image image[i] is the image to display (in a machine specific format) in the section of the path specified by path[i]..path[i+1].

• levels if is.na(image) then levels[i] is the stimulus level in cd/\(\mbox{m}^2\) in the section of the path specified by path[i]..path[i+1]

• sizes sizes[i] is the size of stimulus (diameter in degrees) to use for the section of path specified by path[i]..path[i+1], or a scaling factor for images[i].

• colors colors[i] is the color to use for the stimulus in the section of path specified by path[i]..path[i+1]. Ignored if !is.na(image).

• speedsspeeds[i] is the speed (degrees per second) for the stimulus to traverse the path specified by path[i]..path[i+1].

• ... machine specific parameters

Octopus 900

x and y are in degrees, with precision to three decimal places recognised.

image is not possible on an Octopus 900.

levels are in cd/\(\mbox{m}^2\), and are rounded to the nearest one tenth of a dB for display.

colors are ignored. Use opiSetBackground() to alter stimulus color.

sizes are in degrees, but are rounded to the nearest Goldmann Size I..V for display.

Kowa AP 7000

Only a simple path with a start and an end point is supported by the AP-7000.

x and y are in degrees and should only be length 2. (precision?)

image is not possible on an Kowa AP 7000.

levels are in cd/\(\mbox{m}^2\) in the range 0.03 to 3183, and are rounded to the nearest one tenth of a dB for display. (precision?)

colors one of .OpiEnv$KowaAP7000$COLOR_WHITE, .OpiEnv$KowaAP7000$COLOR_GREEN, .OpiEnv$KowaAP7000$COLOR_BLUE, and .OpiEnv$KowaAP7000$COLOR_RED.

sizes are in degrees, but are rounded to the nearest Goldmann Size I..V for display.

speeds are in degrees per second in the range 3 to 5.

Compass

Not implemented.

See Also

opiSetBackground, opiStaticStimulus, opiTemporalStimulus

Examples

# NOT RUN {
# A Size III white kinetic stimuli on a bilinear path {(27,27), (15,20), (0,0)}
stim <- list(path=list(x=c(27,15,0), y=c(27,20,0)),
             izes=rep(0.43,2),
             colors=rep("white",2),
             levels=rep(318,2),
             speeds=c(4,3))
class(stim) <- "opiKineticStimulus"
# }