ch.4 essay question

-According to the text, identify an absolute threshold.  In this essay, identify the term and give an example along with the absolute thresholds that are associated with the senses in the text.

:Vision - A candle flame 30 miles away. Hearing - A watch ticking 20 feet away. Smell - A drop of perfume in a 6-room house. Taste - A teaspoon of sugar in a gallon of water. Touch - A wing of a fly on your cheek, dropped 1 cm.

-Identify the various vision problems that can occur during your lifetime.  Give an example of each problem.

 pg 125 under visual problems

-What is the difference between a warning system and reminding system when dealing with pain?  Explain each along with an example. pg135

 warning: a pain that last for a short time

reminding: constant pain

-Identify six pictorial depth cues that we see in our visual field.  In this essay, explain each along with an example. pg 146-147

• relative size.
• interposition.
• linear perspective.
• aerial perspective.
• light and shade.
• monocular movement parallax.