1.To study how our ability to hear depends on the location of the source of the sound.

2.To determine how we detect the direction of the source of a sound.

3.To compare our sensitivity to touch/pain on the fingertip, back of hand, upper arm, and cheek..

4.To study the location and abundance of our sensory receptors for touch, pain, hot, and cold on the palm of our hands and back of our arms.

1.My ability to hear will be best from a source of sound located (what combination of behind, in front of, beside, above, below ?) my ears.

2.I will be able to detect the source of a sound best from (what combination of behind, in front of, beside, above, below ?) me.

3.My sensitivity to touch/pain will be least on my , second on my , third on my , and best on my .

4.The number of sensory receptors on the palm of my hand will be the least for , second for , third for , and the most for .

5.The number of sensory receptors on the back of my lower arm will the least for , second for , third for , and the most for .

Paper clipsCotton ballsHot water PencilsRulerBeaker

PropanolIce cubesPlastic gridDividers5 X 5 gridString

1.Proceed with your partner to a reasonably quiet area away from other students and distractions.

2.Your partner is to make quiet sounds near various areas of your head by either snapping their fingers or if unable to do so, tapping two pencils or similar objects together. It is important that the loudness of the sounds be as similar as possible for all locations tested.

4.Reverse roles with your partner and repeat Procedures 1-3.

7.Reverse roles with your partner and repeat Procedure 6.

1.Sterilize the tips of the dividers by dipping the tips into a small beaker containing propanol and then if necessary wiping them with a cotton swab. Set the divider tips at 5 cm apart.

2.Be sure your upper arm is uncovered. In a comfortable seated position close your eyes and place your hand loosely on the desk palm side up.

4.Repeat this same procedure for each of the other three areas to be tested:

Back of the hand, cheek, and upper arm. Record all results under Trial 1.

5.Reverse roles with your partner and repeat Procedures 1-4.

1.Obtain a plastic 5 cm by 5 cm labelled grid and a short piece of string.

2.Lay the plastic grid on the palm of your hand. In a comfortable seated position close your eyes and place your hand loosely on the desk palm side up.

4.Reverse roles with your partner and repeat Procedures 1-3.

5.Repeat Procedures 1-4 for each partner but lay the grid on the back of the lower arm just below the inside of your elbow..

1.Why is it easier to detect the location of a distant sound to the right or left than from other directions ?

2.Which parts of your body are generally most sensitive to all types of touch sensations.

3.Why is it advantageous that these areas from Question #2 be most sensitive ?

4.Which parts of your body are generally least sensitive to all types of touch sensations.

5.Why is it advantageous that these areas from Question #4 be least sensitive ?

1.From which areas around the head were you able to hear sounds the best ?

2.From which directions were you best able to detect the location of a distant sound ?

3.Rank the four areas of the body tested in increasing order of your sensitivity to touch/pain.

Write "The increasing order of my sensitivity to touch/pain is least on my , --- etc.

T = YES for TOUCHP = YES for PAINBLUE = YES for COLDRED = YES for HOT

5.Rank the abundance of the four types of sensory receptors on the palm of your hand.

6.Rank the abundance of the four types of sensory receptors on the back of your lower arm.

7.For each of Conclusions 1-6 above, which agree and which disagree with your original hypotheses ?

1.Instrumental:

List the names and state the uncertainty of any measuring instruments used.

2.Procedural:

List factors that we were unable to control but that might affect the results.