Free-operant escape-avoidance of noise by rats.
A loud noise becomes aversive enough to maintain escape responding only after it has been paired with shock.
01Research in Context
What this study did
Scientists put rats in small boxes with two levers.
One lever turned off a loud noise.
The rats first learned to escape electric shock.
Later, the same noise played alone.
The team wanted to know if the rats would press to escape the noise even when no shock came.
What they found
Rats pressed the lever only when the noise had been paired with shock before.
Noise at 105 dB or louder worked.
Lower volumes or un-paired noise did nothing.
The sound itself was not scary; it had to be conditioned by shock.
How this fits with other research
AZRIN et al. (1963) showed that even two seconds of shock-free safety keeps rats pressing.
Lowe et al. (1974) adds that the warning cue must first be linked to that shock.
Reynolds (1966) found high-intensity sounds speed up simple discriminations.
Here, high intensity was also needed, but only after shock pairing.
Together, the papers show intensity matters, yet pairing matters more.
Why it matters
When you use auditory cues to signal break or escape, first pair the cue with a real aversive event.
A loud buzzer alone will not control behavior.
Test the pairing and watch for generalization.
This keeps your warning stimuli effective and your avoidance programs humane.
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Join Free →Before using a buzzer as an escape cue, pair it twice with a brief known aversive and then probe for lever press or break response.
02At a glance
03Original abstract
A series of experiments was conducted to establish free-operant escape-avoidance responding in rats using noise as the stimulus. Naive rats did not acquire a bar-press response on an escape-avoidance of noise schedule. Similarly, free-operant responding established using escape-avoidance of shock was not maintained when noise was substituted for shock. Noise stimuli of 110 dB did maintain responding, but at a lower level than during training, when the noise stimuli had first been paired with shock. Noise stimuli of 97 dB and 87 dB were not effective under those same conditions. Additional rats were trained on a free-operant escape-avoidance schedule of shock and then exposed to a delayed conditioning procedure in which noise was the conditioned stimulus and shock was the unconditioned stimulus. When these subjects were then tested with noise alone, two of the three subjects conditioned and tested with 105-dB noise displayed escape-avoidance of noise, but none of the rats conditioned and tested at 97 dB displayed escape-avoidance of noise. The results suggest that free-operant escape-avoidance of noise can be demonstrated; however, only higher intensity noise stimuli that have been paired with shock are effective.
Journal of the experimental analysis of behavior, 1974 · doi:10.1901/jeab.1974.22-219