Lemon Juice Experimental Test PDF

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Professor Chen...

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Lemon Juice Experimental Test Eysenck Lemon Juice Measure    

The Cotton Swab Scale Introverts produce about 50% more saliva! (Corcoran, 1964, in Phares, 1991) 3’23”

THE TEST In our test, the introverts produced 50% more saliva than the extraverts. But it’s worth bearing in mind that there are lots of other factors that affect saliva production, such as time of day and how thirsty you are.  The amount of saliva you produce after putting a drop of lemon juice on your tongue might tell you something about your personality. It’s to do with a part of your brain called the Reticular Activating System (RAS) which responds to stimuli like food, or social contact. For example, it controls the amount of saliva you produce in response to food. A good food stimulus is lemon juice. Squeezing lemon juice on to your tongue makes your mouth water, and it does this because your RAS is responding to the lemon juice.  Scientists now think introverts have increased activity in their RAS and therefore increased production of saliva. The theory is that the RAS in introverts has a high level of activity, even when it isn’t being stimulated. So it only needs a small stimulus to produce a large response. This means that introverts are likely to produce a large amount of saliva in response to lemon juice. But because the RAS also reacts to social contact, introverts react more strongly to meeting people too.  In extraverts, on the other hand, there is a low level of activity in the RAS when it isn’t stimulated, so they require a much larger stimulus to generate a response. So they usually produce less saliva in response to lemon juice than introverts, but are more comfortable with social contact. You will need:   

Lemon juice Kitchen scales Cotton wool balls

This is what you need to do:   

Put a large drop of lemon juice on your tongue and swill it around your mouth for ten seconds Use the cotton wool balls to mop up all the saliva that you produce When you’ve mopped it all up, put the cotton wool balls on your kitchen scales and see how much they weigh

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Compare your results with your friends and family, and see whose weighs the most We expect that you will find: That introverts produce a lot of saliva in response to lemon juice That extraverts don’t produce much saliva in response to lemon juice

Now try our personality test and our ‘necker cube’ experiment to see if they say you are more of an extravert or an introvert. And to find out whether the results from the lemon juice experiment tally up.  In our test, the introverts produced 50% more saliva than the extraverts. But it’s worth bearing in mind that there are lots of other factors that affect saliva production, such as time of day and how thirsty you are.  Amazingly, if this test is done in a carefully controlled setting, the amount of saliva produced is highly correlated with the self-report scale items we just saw. THE LEMON JUICE DEMONSTRATION  

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It has been reported that introverts produce more saliva than do extraverts (Corcoran, 1964, in Phares, 1991): Tie a thread to the centre of a double-tipped cotton swab so that it hangs perfectly horizontal Person swallows three times then put one end of the swab on the tongue, holding it there for 30 seconds Then 4 drops of lemon juice are placed on the tongue. After swallowing the person places the other end of the swab on the same portion of tongue for 30 seconds. Swab will remain horizontal for extraverts, hang down on the lemon juice end for introverts (indicating a relatively large amount of saliva produced in response to the lemon juice) Nonetheless, other more sophisticated tests give conflicting results....