Bell-Ringer 10/27

• 1. From memory, sketch a diagram of an eye and label the following parts.– CORNEA– IRIS– PUPIL– LENS– RETINA– OPTIC NERVE

Bell Ringer 10/28

• 1. Choose two of the 6 senses from your chart. Create a Venn Diagram comparing these two senses. – At least three similarities in

center.– At least three differences on the

sides.

Sensation and Perception

The Biological Basis of Behavior: Unit III

I. Sensation

• A. occurs anytime a stimulus activates one of the receptors in your sense organs

What if we could sense everything?

Life would hurt…

so we can only take in a window of what is out there.

II. Perception

• A. definition –The process of organizing and interpreting information our sensory information.

Don't read the words -just say the colors they're printed in, and do this aloud as fast as you can.

III. Principles of Perception

– 1. Stroop effect

• Recognizing and naming colors requires more of our attention than reading.

What do you see?

• 2. Gestalt – a. tendency to integrate

pieces of information into meaningful wholes

– b. we see patterns and groupings, instead of small, individual pieces.

What do you see?

• 3. figure-ground relationship– a. organization of

the visual field into objects (figures) that stand out from their surroundings (ground)

• 4. perceptual set - predisposition to perceive something in relation to prior perceptual experiences

Old lady or Young Woman?

• 5. optical illusions– SOMETIME OUR VISUAL PECEPTION

TRICKS US!

IMPOSSIBLE FIGURE

This optical illusion works because we try to assign a three dimensional aspect to a two dimensional picture. The technique of perspective angles has been used.

Do you see grey dots?

Explanation: The eye, which responds to an amazingly wide variety of light sources from moon light to direct sunlight, tries to adjust to the present light levels. In this optical illusion, the contrast between the black and white is so strong and irregular that the white ends up looking gray.

Which line is longer?

This is one of the most studied optical illusions. It was created by a German psychiatrist named Franz Müller-Lyer in 1889. It is not well understood why this optical illusion works

Which box has the smaller man?

The tunnel creates a believable sense of perspective in this optical illusion. The second

man looks bigger than it is because it seems to fill up the tunnel.

http://www.illusion-optical.com/Optical-Illusions/SpinningFlowers.php

Are the lines below straight or are they

curved?

Bell Ringer 10/29

• 1. What is perception?

• 2. Yesterday we went over four different laws of perception. Describe at least two of these laws.

IV. Depth Perception

• A. definition – the ability to see objects in three dimensions although the images that strike the retina are two dimensional.

• B. we use perceptual clues to determine distance and depth

– 1. Interposition - if something is blocking our view, we perceive it as closer

– 2. Relative Size - if we know that two objects are similar in size, the one that looks smaller is farther away

– 3. Relative Height - things higher in our field of vision, they look farther away

– 4. Linear Perspective - Parallel lines seem to converge with distance

Relative height & size

• 5. relative brightness – brighter objects appear closer than dimmer objects.

• 6. aerial perspective – Atmospheric conditions (haze, dust) . Clearer objects seem closer.

• Relative size• Linear

perspective• Aerial

perspective• Relative

height• Interposition