Neural explanation of motion

Question 1

Simplified Reichardt detector

Answer 1

Idea that two cells receive input from different receptive fields. The delayed input of one cell causes the input of the next to arrive simultaneously

Coincidence detectors (neurons) go off due to the simultaneous input causing sense of motion

Question 2

X-T plane

Answer 2

Bar moving to the right (x direction) can be seen as diagonal if time is 3rd dimention

Because of that, the direction is the same as the orientation selectivity; the X-T plane

The D-max means there are no neurons tuned for that orientation in X-T space

Question 3

MT

Answer 3

Place where motion selectivity is mosly detected (V1, V3 and MT)

Often plotted in a polar tuning curve

Question 4

Aperture problem

Answer 4

Aperture (hole) only shows small part of motion. Through that hole you can’t see the actual direction

Problem in V1 cells

Question 5

Plaid motion

Answer 5

Aka pattern motion is ability to combine two seperate motions in to one new motion. Cells that detect this motion solve the aperature problem

Question 6

Component cell

Answer 6

Cell that doesn’t see the pattern motion, but always fires to the component that goes in the selected direction

Question 7

Pattern cell

Answer 7

Cell that is tuned to same movement, but also for the combined motion