"biomiki" <michele.stefanoli from tin.it> wrote in message
news:46ece86a$0$10623$4fafbaef from reader2.news.tin.it...
> Whitch is the difference between:
> - conditionated contextual stimulus
Sometimes the terms used by various people that investigate conditioning is
not very standard. This term sounds like a reference to "occasion setting"
in Pavlovian conditioning. In such procedures the occurence of a potential
CS is uncorrelated with the occurence of a US unless a second stimulus is
present. My guess is that this "second stimulus" is temporally extended,
whereas the CS tends to be brief, but I'm not sure. I know such procedures
exist, and that the CS only functions as a CS when the "occasion-setting"
stimulus is present. Otherwise I don't know much about the procedures.
> - discrete CS
It is hard to say what this might mean without a context. It might simply
mean that a CS is spatially- or temporally-localized.
> - explicit CS?
Again, it is hard to say what this might mean without a context. It might
refer simply to the fact that one stimulus is explicitly arranged by the
experimenter as a CS. For example, if one delivers shocks during a tone, but
also delivers them when the tone is not present, the tone does not become a
CS. One explanation involves the Rescorla-Wagner equation and suggests that
the whole experimental apparatus is a set of (non-explicit) stimuli.
It sounds vaguely like you may be talking about experiments that show that
"pairing" of stimuli is insufficient to produce conditioning. If you give me
the context of these terms, I might be of more help.