OPI (version 3.1.1)

opiPresent_for_Envision: Implementation of opiPresent for the Envision HMP.

Description

This is for internal use only. Use opiPresent() after chooseOPI("Envision") to call this function.

Value

A list containing:

• err NULL if there was no error, a string message if there is an error. If there was no error the the following fields are also returned.

• stamp Time stamp of stimulus onset.

• time Response time from stimulus onset if button pressed (ms).

• seen TRUE if seen, FALSE if not.

• lpupil, rpupil Fixation positions (x, y), and diameter (d) for both left (lpupil) and right pupils (rpupil).

Arguments

stim

A list containing:

• eye Eye where to present the stimulus

• x x-coordinate

• y y-coordinate

• sx Size in the x-axis (diameter for circles).

• sy (Optional) Size in the y-axis (diameter for circles). Defaults to sx

• level Stimulus level

• theta (Optional) Stimulus rotation from 0 to 360 degrees. Defaults to 0

• t (Optional) Stimulus presentation time. Defaults to 200 ms

• window (Optional) Response window. Defaults to 1500 ms

...

Parameters for other opiPresent implementations that are ignored here.

See Also

opiPresent()

Examples

if (FALSE) {
chooseOpi("Envision")
opiInitialise(address = list(port = 50001, ip = "localhost"))
result <- opiPresent(stim = list(eye = "os", x = 5, y = 4, sx = 0.43, level = 0))
}