Introductions and Vision

Sensation and Perception

Bottom Up ProcessingStarting 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 ProcessingWe 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 AdvantagesFailures 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 ThresholdThe 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 passeshttp://www.youtube.com/watch?

v=vJG698U2Mvo&safe=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 imagesStare at the yellow + in the middle of figure

for 15-30 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".