Description Usage Arguments Value
Bias answers the question, "Which image was this subject viewing during a certain window of time?" For this calculation, we count the number of frames spent on each AOI and multiply the frame-counts by the duration of the window. Over a 100ms (6 frame) window, 3 frames on one AOI would receive a weight of 300. Ties are broken by choosing the image with the earliest fixation. In that same 6 frame window, if 3 frames are spent each on 2 AOIs, the weights would be tied, so the AOI that was fixated on first would be chosen.
1 | CalculateBias(x, window)
|
x |
a Trial with a |
window |
a twq-element vector specifying the window of time within which to calculate the image bias. |
the Trial object(s) updated to include two new attributes:
Bias
, the name of the AOI with the highest bias or NA
if
there are no looks to the AOIs during the time window; and
BiasSummary
, a data-frame detailing the bias calculation.
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