Perception is a PROCESS which takes TIME and if it takes too much time, speech and language may be affected.
Another important feature about perception, which the Gestaltists demonstrated when they reduced the exposure time of the stimulus is that perception is a PROCESS. The brain is doing something with the impulse flow and it requires TIME.
That is something we lose sight of in our daily lives. We look, hear and feel things and have what seems like instant recognition. It is rare that we have to peer to see or strain to hear something, but when we do, it typically takes longer.
If we have the time to wait, we can finish the processing and understand what was transduced with no harm done. But sometimes the stimulus is transient--lasting only a fraction of a second. There is no second change.
Speech is this way. We hear it and it is gone, only to be immediately replaced by another string of words, which themselves are very fleeting. This reminds me of dictation tests I have had to struggle with.