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Psychol. Neurosci. vol.4 número1

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Figure 1 shows the several stages of contrast transfer  from object generation on a display, such as a cathode  ray tube (CRT) display (Figure 1A), modulation transfer  through  the  eye  optical  elements  (Figure  1B),  and  the  end result of contrast t
Figure 2. Comparison between contrast sensitivity functions (CSFs) obtained from several vertebrates using various behavioral  and electrophysiological methods
Figure 2 shows the CSFs of several species. We can  observe  the  similar  shapes  and  different  positions  of  the  contrast  sensitivity  and  spatial  frequency  coordinates
Table 1. Contrast sensitivity and visual acuity of different species studied by psychophysics, electrophysiology, and optokinetic responses.
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