Sound Direction
A very simple experiment you can conduct with young pupils involves demonstrating how they can use sound to determine direction. Clear an area to make it safe. Have the pupil cover her eyes or use a blindfold. Have other pupils form a circle around her and take turns calling out to her. See if she can point out where each person is calling from.
Taste and Smell
You can show pupils how our senses of taste and smell work together to tell us about the food we are eating. Take a potato, an apple and a pear. Slice each into similarly sized and shaped pieces. Have the pupil wear a blindfold and hold his nose. Have him take a bite of each, and ask him to tell you which one he tastes each time. Have him repeat the process without holding his nose. Was he as accurate while holding his nose as he was without?
Depth Perception
Explore the concept of depth perception and binocular vision with children using pennies and a plastic cup. Have the child sit at a table and place a hand over one eye. Place the cup two to three feet away from the child. Hold a penny about 18 inches above the table. Tell the pupil to have you drop the penny when she sees it is over the cup. Tell her the goal is to get the penny into the cup. Move the penny around, occasionally passing it over the cup, until she tells you to drop it. Did it land in the cup? How did covering one eye affect her ability to judge distance and depth? Repeat the experiment, this time allowing her to use both eyes.
Touchy Feely
You can demonstrate how we use touch to identify objects, and how some parts of our body have more touch receptors than others, using objects you can find in your home or garden. Have the child wear a blindfold. Take a tennis ball, a small rock, a baseball and a shoe. Gently press each object against an area of the child's upper back or shoulder. Ask him to identify the object. Was he able to guess correctly? Now allow the child to use his hands and fingers to touch the same objects. Was he able to identify them better by using his hands?