The computer-controlled automatic shuttle box
(TSE, Bad Homburg, Germany) was located in a sound-attenuating enclosure ventilated by an extractor fan.
If the animal avoided the unconditioned stimulus by running into the dark compartment within 5 s of the onset of the CS, the shuttle box recorded an avoidance response.
As a direct results of the prenatal brain oxidative stress and the decrease of glutathione in pups, findings of the learning test in shuttle box showed that a significant impairment of active avoidance learning was clearly observed in pups born to LPS-treated mothers.
The apparatus used for training rats in order to assess their short-term and long-term memory was the shuttle box .
At day 14(1st day of training), all rats were placed in the shuttle box and had access to the light or dark compartment for 1h.
During the acquisition tests in sessions 1-4 and the extinction test, we recorded the percentage of correct avoidance responses, in which the animals moved to the other compartment of the shuttle box
within a 5-sec CS in each block of 25 trials.
Recently, Balleine and Job (1991) have reported evidence suggesting that manipulations of activity, or more precisely inactivity, during training can also affect performance during a shuttle box escape test.
Given the unknown interaction between appetitive and aversive drive in the case of inescapable shock, it was considered important to maintain the appetitive drive during both exposure to inescapable shock and during the shuttle box escape test 24 hours later.
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