The correct answer is A. True
A search for the happiness center located in the brain may not be successful since brain areas linked with particular emotions vary considerably. Psychologists have already tried to study the neural mechanism behind happiness. However, this is an area that is filled with mystery specifically for neurologists who until now have not been able to accurately identify the parts of the brain that is connected with happiness.<span> </span>
<span>The term validity indicates the ability of a test to measure what it is actually designed to measure.
</span>The concept of validity was formulated by Kelly in 1927. A test is valid if it measures what it claims to measure (t<span>he quality or state of being valid).</span>
