Abstract
We have investigated the detectability of small contrast changes in compound suprathreshold gratings, containing two sinusoidal components. We examined the relationship between the detectability of changes in each of the components alone and the detectability of changes in the two components together. It was found that for the pairs of spatial frequencies 1 and 9 c deg there is a square law summation, but for spatial frequency pairs ω and 3ω there is a greater summation which depends on the relative phases of the gratings components. The results indicate the existence of broadband phase selective spatial frequency channels, of 2 octaves bandwidth.
Original language | English |
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Pages (from-to) | 1595-1606 |
Number of pages | 12 |
Journal | Vision Research |
Volume | 23 |
Issue number | 12 |
DOIs | |
State | Published - 1983 |
Keywords
- Bandwidth
- Channels
- Compound stimulus
- Psychophysics
- Sinusoidal grating
- Spatial frequency