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direct/indirect perception

hello all,

I'm not very clear about ecological perception theory.

I read that it explains auditory perception as the extraction of
features (the structural and transformational invariants) which specify
the sound producing event (respectively, the object and the action
applied on it).

Since it involves some intermediate representations and, I guess, some
kind of memory model of it, in what sense is it a more 'direct'
perception than other theories.

Moreover, in that context, how do an imaginary sound (therefore not
related to any known objects or actions) could be perceived as a
perceptual entity?

Thanks in advance.

Julien Ricard