Tahafut_al-Tahafut-transl-Engl-van-den-Bergh

from the wolf while it walks behind the mother. Discord and
concord need not be in bodies like colour and shape, but it
sometimes happens that they occur in bodies. This faculty
differs from the first, and is located in the posterior ventricle
of the brains
The third faculty is called in animals the imaginative and
in man the cogitative, b and its nature is to combine the
sensible forms and to compose the intentions with the
farms:’ it is located in the middle ventricle between the place
where the forms are kept and that where the intentions are
retained. s Because of this man can imagine a horse that
flies and a being with the head of a man and the body of a
horse, and other combinations, although he has never seen
such things. It is more appropriate, as will be shown, to join
this faculty with the motive faculties than with the
apprehensive. ‘ The places where these faculties are located
are known only through medicine, for if a lesion occurs to
one of these ventricles the faculties become defective.
Further, the philosophers affirm that the faculty on which
the forms of sensible things are impressed through the five
senses retains these forms so that they do not disappear
after their reception, for one thing does not retain another
through the faculty by which it receives it, for water receives
without retaining, while wax receives through its wetness
and retains through its dryness, by contrast with water. “
Through this consideration that which retains is different
from that which receives, and this is called the retentive
faculty. And in the same way intentions are impressed on the
estimative faculty, and a faculty retains them, which is called
the memorative. ‘ Through this consideration, these internal
perceptions, when the imaginative faculty is joined to them,
become five in number, like the external faculties.
The motive faculties’ form two classes, in so far as they
are only stimulating motion or executing motion and acting;
the stimulating motive faculty is the impulsive and appetitive
faculty; this is the faculty which stimulates the acting motive
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