How are symbols and motifs used to create suspense and meaning in ''Tell-Tale Heart'' and the Psycho film?

Since both "The Tell-Tale Heart" and Hitchcock's
Psychoare Gothic in nature, there are dark and foreboding objects. 
One animal that is depicted in both stories is the large bird;  in Poe's tale, the
vulture eye of the old man is mentioned several times by the narrator, while in
Psycho there are large dead stuffed birds that loom over Marion
Crane in her motel room. 

Spying upon their victims, both
the narrator of Poe's tale and Norman Bates of Psycho view their
victims surreptitiously.  However, in "The Tell-Tale Heart," the old man does realize
that the narrator is watching him, while Marion does not know of Norman's
voyeurism.

Of course their is the motif of terror that
predominates both works.  As the old man realizes
that

Death, in
approaching him, had stalked with his black shadow before him and enveloped
him.

Likewise, Marion utters
shrieks as the unknown woman suddenly and repeatedly stabs at her in the shower.  After
having committed their dastardly deeds, both the narrator and Norman Bates resume their
normal activities and when the authorities come to ask questions, they are cooperative. 
Finally, however, both Norman and the narrator come undone with the narrator claiming
that the heart is yet beating under the floor boards where he has buried the old man
while Norman claims that his mother has killed the girl in a jealous
rage.