Neuroscientific Approach
Neuroscience and brain imaging has shown increasing potential for helping science understand happiness and sadness. Though it may be impossible to achieve any comprehensive measure of happiness objectively, some physiological correlates to happiness can be measured. Stefan Klein, in his book The Science of Happiness, links the dynamics of neurobiological systems (i.e., dopaminergic, opiate) to the concepts and findings of positive psychology and social psychology.
Nobel prize winner Eric Kandel and researcher Cynthia Fu describe their findings that depression can be diagnosed very accurately just by looking at fMRI brain scans. The idea is that, by identifying neural correlates for emotions, scientists may be able to use methods like brain scans to tell us more about all the different ways of being "happy".
Read more about this topic: Positive Psychology, Methods
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“We have learned the simple truth, as Emerson said, that the only way to have a friend is to be one. We can gain no lasting peace if we approach it with suspicion or mistrust or with fear.”
—Franklin D. Roosevelt (1882–1945)