Question

What does one experience when an ISI is too slow? What does one experience when an ISI is too fast?

Answer 1

1)I , assigned the shortest to the 80 pixels do distance which is also the shortest distance .

Then I, assigned the longest ISI to the 240 and 400 pixels dot distance which are the ranked the middle and farthest distance respectively. There is a positive linear relationship between the dot distances and the ISI I assigned. The relationship is the same for the group data which also has a relatively linear positive linear relationship.

2) According to the Helmholtz’s likelihood principle, we perceive the object that is most likely to have caused a sensory signal. If the ISI is too slow, we perceive the first dot to flash on the right then the second dot to flash on the left at two different locations and we do not perceive apparent motion. This is consistent with the Helmholtz’s likelihood principle because it is usually unlikely for the same dot to appear at two different locations at the same time, thus we do not perceive it as the dot moving from one location to another (apparent motion). On the other hand, if the ISI is too fast, the two stimuli appear to flash simultaneously and we do not perceive apparent motion. This is because usually, it is unlikely for an object to cover such a distance in such a short period of time, which consistent with the Helmholtz’s likelihood principle whereby we perceive objects in a way that is most likely to occur.