These damages
from without we class roughly as environmental.
From within the mental workings may be injured by emotional dominance;
by bad habits of thinking and feeling and doing--often the result of
wrong methods of education; by defective heredity; by undeveloped will;
by the insanities. These danger sources from within we might classify as
self-produced and hereditary.
There may be disorders of any or every function of the intellect,
disorders of feeling, and perversions of will. Some of the most commonly
met we list below.
Disorders of the _Functions_ of _Intellect_.
/ Hyperesthesia (exaggeration of sensation)
{ as found in neurasthenia, or in mania.
{ Anesthesia (absence of sensation)
{ as in the numbness of hysteria; in sensory
{ paralysis.
Disorders / Retardation
of < as in dementia and melancholia.
Sensation \ "Clouding" or dulness
{ as in simple depression.
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