AddRelativeGazes: Find gaze location relative to target image

In tjmahr/lookr: Tools to Analyze Looking While Listening or Visual World Eyetracking Experiments

Description

Creates new columns that measure gaze location relative to the location of the target image, so that the x and y gaze positions increase the gaze gets closer to the target. The new columns are XLeftToTarget, XRightToTarget, XMeanToTarget, YLeftToTarget, YRightToTarget, YMeanToTarget.

Usage

AddRelativeGazes(x)

Arguments

x	a Trial with Task or Protocol attributes or a TrialList where each Trial has these attributes

Details

Normally, the x value (as in trial$XMean) increases as the gaze moves right on screen. When the target is left side of the screen, small x means the gaze approached the target, but when the target image is on the right, larger x means the gaze approached the target. This function flips the x value (sets x to 1-x) on trials where the target is on the left side of the screen, so that bigger x means the gaze approached the target regardless of which side of the screen the target was on. An analogous transformation is done for the y coordinate.

Value

the Trial object(s) with the AOI data attached as new columns.

tjmahr/lookr documentation built on May 31, 2019, 3:41 p.m.