Table 5.

ASR-PPI settings in the participating centers

Testing Conditions	CNR	GSF	ICS	MRC
Startle device	SR-Lab	Med Associates	SR-Lab	custom made
Animal enclosure/inside diam., cm	Plexiglas cylinder, 3.8	Plexiglas cylinder, 4.3	Plexiglas cylinder, 3.8	Plexiglas cylinder, 3.8
Tone frequency	white noise, 0–20 kHz	white noise, 0–20 kHz	white noise, 0–20 kHz	white noise, 0–20 kHz
BN, dB	65	40	65	65
Pulse, 110 dB	45 dB above the BN	70 dB above the BN	45 dB above the BN	45 dB above the BN
Prepulse, 70–90 dB	5–25 dB above the BN	30–50 dB above the BN	5–25 dB above the BN	5–25 dB above the BN

ASR, acoustic startle response; PPI, prepulse inhibition; BN, background noise.