Our data showed a trend but not a significant effect of upper versus lower hemifield; this marginal effect was unlikely to be due to a fixational bias or drift (Kowler & Steinman, 1979 ) given that the fixation target was only 0.2 vd in diameter and stimuli duration was only 150 ms.
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The sentences
The CF trended upward with target eccentricity, and the increase was marginally significant.