Relative durations of conditioned stimulus and intertrial interval in conditioned suppression.
Short warning cues paired with long safe periods keep the cue powerful yet let anxiety fade faster between uses.
01Research in Context
What this study did
Scientists trained 48 rats to press a lever for food. Then they added a warning sound followed by a mild shock.
Half the rats got a 10-second warning. Half got a 60-second warning. The time between trials also changed so the warning-to-gap ratio was 1:3, 1:11, or 1:35.
What they found
Every rat froze completely while the warning sound played, no matter how long it lasted.
Between trials, freezing dropped when the warning was short and the gap was long. The smaller the warning-to-gap ratio, the less fear spilled into the safe period.
How this fits with other research
Reynolds et al. (2013) also used inbred mice and saw rigid grooming drop only in duration, not pattern. Both labs show timing tweaks can cut behavior time without changing its form.
Capio et al. (2013) found that isolation rearing changed social novelty but not overall approach. Like A et al., they show that one part of a response chain can move while the core stays locked.
Ryan et al. (2019) saw BTBR mice prefer odor over actual contact. Together these papers warn us: in lab models, measure both the amount and the form of behavior or you can miss the real story.
Why it matters
If you use warning stimuli to reduce problem behavior, keep the signal brief and the safe period long. The warning will still suppress behavior when it is on, but the client will recover faster once it ends. This ratio trick can cut carry-over anxiety without weakening the cue itself.
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02At a glance
03Original abstract
The effects of the relative durations of the conditional stimulus and the intertrial interval on bar pressing during a conditioned-suppression procedure were examined as a function of two additional variables--type of operant baseline schedule and rate of shock presentation. In Experiment 1, response suppression was compared across components of a multiple fixed-ratio, random-ratio, fixed-interval, random-interval schedule, at relative conditioned-stimulus/intertrial-interval durations of 1/1, 1/4, and 1/9. In Experiment 2, relative conditioned-stimulus/intertrial-interval duration (1/5, 3/3, or 5/1) was manipulated across groups, while shock frequency (2, 6, or 10 shocks/hr) was manipulated within groups. In both experiments, suppression during the signal was virtually complete at all relative durations. Responding was also suppressed during the intertrial interval, but that suppression varied as a function of experimental manipulations. In Experiment 1, intertrial-interval response rates were higher when relative signal duration was 1/9 than when it was 1/1, although both relative signal duration and shock frequency, which covaried, could have contributed to the difference. In Experiment 2, the patterning of response rates between successive shocks was affected by relative duration, absolute rates during the intertrial interval varied as a function of shock frequency, and differences between suppression during the signal and suppression during the intertrial interval were affected by both relative duration and shock frequency. The data support an analysis based upon relationships between shock-correlated and intertrial-interval stimuli and, as assessed by the relative-delay-to-reinforcement metric, are comparable to results that have been reported from experiments using similar manipulations under the autoshaping paradigm.
Journal of the experimental analysis of behavior, 1986 · doi:10.1901/jeab.1986.46-51