TEN LITTLE FINGERS - Arvind Gupta

SightOUR SENSES1. Look at a distant object. Then hold up your fingerat arm’s length With one eye closed look at the scenejust over the top of your finger. Note the object thatyou see. Without changing the position look at thescene with the other eye The background shifts. Yousee a different object beyond your finger. This showsthat a different image is observed in each eye.2. Try to bring the wide end of a pencildown to touch another wide end of a pencilheld in front of you. First try it with one eyeclosed. You miss quite easily. But with twoeyes you can do it all the time. Both eyesare needed to sense the distance of anobject.Touch1. Touch different point of a tooth - pick or thin nailto different spots on the back of your middle finger.You will feel the pressure of the nail pointswherever you touch it to the skin. But at somepoints you feel the point more sharply than theothers. These are the spots that feel pain.2. Place the points of two pencils heldclosely together against the back of ablindfolded person’s neck. He feelsthem as one point. But when touchedto his finger he feels two. The sense oftouch is much more sensitive in thefingers than on the back of the neck.3. Touch a pencil to thecrossed fingers of ablindfolded person. Hethinks there are twopencils because he feelsthem on opposite sides ofthe fingers that arenormally in a differentposition.4. Paste two thin sheets of papertogether. Cut out a square of thispaper and another of a singlethickness. Ask a person to tell ifthey are the same or of differentthickness. Most people can tell byfeeling them, which is thicker. Thisexperiment shows how sensitiveour sense of touch is.5. Feel a metal surface anda wooden one. The metalfeels colder because itconducts heat away fromyour body faster. It isactually at the sametemperature as the wood.