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Measuring the temporal contrast sensitivity function of the phantom array effect
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DOI：10.1177/14771535251379686.png)
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The phantom array effect (PAE) has been widely investigated, but data are still insufficiently consistent to accurately predict the visibility of the PAE. One of the most critical steps towards a visibility measure is the temporal contrast threshold/sensitivity function. To determine this function, we experimentally measured the visibility threshold of the PAE at various frequencies. Participants were instructed to make 54.5 degrees saccades in the dark across a thin light source, subtending a visual angle of 0.2 degrees (horizontally) x 10 degrees (vertically), with a luminance of 50 cd m-2. Their task was to indicate in which of two sequentially presented stimuli they observed the PAE, where one stimulus was the reference driven with a direct current and one was the test stimulus, sinusoidally modulated over time. The QUEST+ method was used to change the modulation depth in the test stimulus. The results revealed a bandpass-shaped sensitivity curve of the PAE, with a peak at about 600 Hz. About 70% of the 22 participants had a peak sensitivity between a modulation depth of 0.04 and 0.13, and 65% of the 22 participants had a peak frequency between 460 Hz and 700 Hz.
Keyword:
SACCADIC EYE-MOVEMENTS
PERCEPTION
期刊
L
IF:
2.2
论文数:
60
被引数:
0
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