ABSTRACT

Conditioning Computerized training (Forth software, USC) took plaa in a semi-opaque box (20 X 20 X 25 em high) with a shock grid made of sliliniess steel rods (0.45 em in diameter, spaced 1.9 em apart) and a removable 12 W light bulb at Ihe top of the box. A speaXerproviding a 1 kHz, SOdB tone was located 15 em in front of the boL The shock grid was connected 10 a shod generator and scrambler 10 provide a 0.5 s, 0.5 rnA footshock. The conditioning box and the floor ..... ~r~ cleaned with 70% ethanol before and after each session. A background noise of 55 dB was provided throughout all experiments.