Two common forms of forward conditioning are delay and trace conditioning.
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Infusion of siRNA segments against CREB have produced deficits in both contextual conditioning and forward trace conditioning.
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*"'Trace conditioning "': During trace conditioning the CS and US do not overlap.
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*"'Trace conditioning "': During trace conditioning the CS and US do not overlap.
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The other is called trace conditioning, where the conditioned stimulus ( tone ) is shorter and stops before the unconditioned stimulus ( air puff ) begins, leaving a gap between the two stimuli.