Transparent and paired dot fields


Two dot fields drift coherently in different directions. The dots may be paired, meaning that each has a partner in the other dot field that crosses its motion path. This stimulus was used to demonstrate that the perception of transparency breaks down if the dots are paired within a critical distance, and that responses in some MT neurons are more strongly suppressed in the paired vs. unpaired condition (Qian et al., 1994).



When the dots overlap, they add and may saturate.