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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Expression of Emotion in Man and Animals by Charles Darwin: laughter and with his face covered with the broadest smiles."
There is another large class of idiots who are persistently
joyous and benign, and who are constantly laughing or smiling.[3]
Their countenances often exhibit a stereotyped smile;
their joyousness is increased, and they grin, chuckle, or giggle,
whenever food is placed before them, or when they are caressed,
are shown bright colours, or hear music. Some of them laugh more
than usual when they walk about, or attempt any muscular exertion.
The joyousness of most of these idiots cannot possibly
be associated, as Dr. Browne remarks, with any distinct ideas:
they simply feel pleasure, and express it by laughter or smiles.
 Expression of Emotion in Man and Animals |