Looking at this picture, what do you see? Do you see their faces or backs?? In order to answer this question we need to be able to detect the edges of the girl and the horse to determine what way they are facing. Similar to what we discussed in class with the blue and gold dress, the background of this photo is bright which can alter the objects in the image. Lateral Inhibition is when cells are in a certain pattern, and when stimulated they either excite or inhibit the cells. Being able to detect edges is known as lateral inhibition.
In order for our eyes to see this image and use edge detection, first our photoreceptors (rods and cones) send information to the bipolar cells, then which excite the ganglion cells, that report to the optic nerve. From the optic nerve the information goes to the occipital and temporal lobe, where vision takes place.
Cells that are right next to each other can receive different stimuli (either intense or moderately intense) which in turns causes the receptive fields to be excited or inhibited. This will then highlight the surface’s edge, the cells start to detect the edges of the object(s). As you sit here and ponder whether the horse and its owner are coming and going, you can see another example of when we must detect edges to determine what is going on in a picture.
This image, which includes my boyfriend and I. Is this one picture or two pictures? We use edgedetection to determine did we take one picture or did we take two seperate pictures and put them together. In this image a bright/light stimulus is being presented to the cells (on my side) and gray stimulus is being presented to cells right next door (on the right side of the photo). The was we perceive the light and how the rods and cones receive this information shows us how sometimes our eyes can trick us to see one picture vs two or the horse coming vs the horse going.
Tell me what you see in these photos!