On Fri, 21 May 1999 10:49:32 -0400 (EDT) Michael Sylvester 

> what really is the key distinctiveness between trace and delay
> conditioning?
> I get the feeling that the stimulus trace is some kind of lingering
> of the echoic or auditory characteristic of the CS.
> But isn't the auditory sensitivity of the dog so refined that even though
> there is a slight pause (to the human experimenter),the dog may still be
> responding to the stimulus trace?
>  So one may be able to condition a dog to a doggie whistle,even though 
> the experimenter may not hear the whistle.

The key distinction between trace and delay conditioning is 
procedural. In trace conditioning you have onset of the CS, offset of 
the CS, followed by onset of the US (in 0-trace offset of the CS and 
onset of the US are simultaneous). With delay conditioning the onset 
of the US follows the onset of the CS but occurs prior to offset of 
the CS. Thus, in delay conditioning there is some period of time 
when both the CS and US are presented concurrently - in trace 
conditioning the CS and US are never presented concurrently. --SLS
+    _----_    Sherry L. Serdikoff, Ph.D.                 +
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