The science of emotion
Matthew Arnold defined the true nature of religion
as "morality touched by emotion", while William Wordsworth wrote that
poetry takes it origin from "emotion recollected in tranquillity". And
both philosophers and psychologists make a clear distinction between sentiments
or feelings on the one hand and emotions on the other. William McDougall
in his 'Introduction to social psychology' (24th edition, 1942) explained
that a sentiment is "an enduring structure within the total structure
of the mind", whereas emotion is a passing phase in the mental process.
In an assessment in Nature for 25 October,
2001, Antonio Damasio, a neurologist from the University of Iowa, has
commented that a century ago an improper distinction was made between
these concepts. The subjective trait of feelings had been projected on
to emotions, making them hidden and elusive. However, an emotion, whether
it be happiness, sadness, embarrassment or pride, can be defined as a
pattern of chemical and neural responses produced by a brain detecting
an external stimulus, and therefore subject to objective description,
unlike feelings.
Emotions allow organisms to cope successfully with
potentially dangerous or advantageous situations, writes Damasio. Most
emotional responses are directly observable with the naked eye or by psychophysiological
or neurophysiological measurements. Feelings are not amenable in the same
way. They are a mental representation of physiological changes prompted
by emotions, and essentially private to the person concerned. "Feelings
amplify the impact of a given situation, enhance learning, and increase
the probability that comparable situations can be anticipated." Emotions,
on the other hand, are controlled by structures in the hypothalamus, in
the basal forebrain and in the brainstem.
Recent studies reveal that areas such as the cortices
in the insula, the second somatosensory region and the cingulate region
undergo a pattern of activation or deactivation when normal individuals
experience sadness, happiness, fear and anger. Patterns vary with different
emotions and show correlation with feelings experienced by the individual,
and by noting them we can gain insight into the relation between the two.
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