In my teachers slides, it says "light hitting the center of the retinal receptive field can either increase or decrease the number of impulses fired"
Is this "or" because it depends on whether the light hits a photoreceptor connected to an on or an off bipolar cell? So does that mean when light hits a certain place, it hits only one photoreceptor? How are these two types of bipolar cells arranged? I thought that if some light hits the center, there is an equal number of on and off bipolar cells.