Introductions and Vision Sensation and Perception

Bottom Up Processing Starting with the sensory receptors and working up to the higher levels of processing. We begin taking in the lines, shading, color, and shapes of the rider and horses in the stream.

Top Down Processing We take in new information using existing experiences and expectations. Looking at the title (The Forest Has Eyes by Bev Doolittle) we re- evaluate what we see and begin to distinguish faces in the surrounding “woods.”

Failures and Advantages Failures of perception may occur anywhere between the sensory detection and the perceptual interpretation. Sense perception allows us the construct representations of the external world. Some might argue that the only certain knowledge is that which can correspond to observations beyond our own subjective thinking and feelings.

Absolute Threshold The minimum stimulation needed to detect a particular stimulus 50% of the time How far away can you be from your music before you can hear it?

Sensory Adaptation

Count the passes active

Impossible Forms

Blind Spot

Subjective Contours Filling the gap. Your brain tries to fill in these pictures with images that really are not there.

After images Stare at the yellow + in the middle of figure for seconds. Then move your gaze off to the white square on the right. Did the colors really reverse themselves? This is an example of an "afterimage".