But we always unconsciously prepare ourselves for any great exertion,
as formerly explained, by first taking a deep and full inspiration,
and we consequently open our mouths. If no exertion follows, and we
still remain astonished, we cease for a time to breathe, or breathe as
quietly as possible, in order that every sound may be distinctly heard.
Or again, if our attention continues long and earnestly absorbed, all our
muscles become relaxed, and the jaw, which was at first suddenly opened,
remains dropped. Thus several causes concur towards this same movement,
whenever surprise, astonishment, or amazement is felt.
Although when thus affected, our mouths are generally opened,
yet the lips are often a little protruded. This fact reminds
us of the same movement, though in a much more strongly
marked degree, in the chimpanzee and orang when astonished.
As a strong expiration naturally follows the deep inspiration
which accompanies the first sense of startled surprise,
and as the lips are often protruded, the various sounds which
are then commonly uttered can apparently be accounted for.
But sometimes a strong expiration alone is heard; thus Laura Bridgman,
when amazed, rounds and protrudes her lips, opens them,
and breathes strongly.
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