Table 1. Characteristics of the four somatosensory and auditory pre-pulses.

The first column, MS, shows the label of the four selected vibratory and/or auditory stimuli used in the graphs and text below; this is also the duration in milliseconds of voltages to the shaker and duration of the broad-band noises in the uni- and multi-modal conditions. The 2nd-4th columns, Cycles, Hz, and ISI) show the programmed characteristics of the vibrations. The 5th and 6th columns, μV and μG, show the magnitude of the pre-pulse, in terms of voltage from the accelerometer and also in calibrated acceleration (where 1μG = 9.8μm/s2). The 7th column, Resonance, shows the amount of any residual vibration persisting beyond the ISI and into the 100ms response period. The 8th column, dB(ML), estimates the level of sound produced by the vibrating platform relative to the mouse audiogram by showing the maximum difference in dB between the power spectrum of sound recorded from a calibrated microphone in the center of the testing tube during each vibration minus an estimate of the C57/BL6J mouse audiogram: 0.00073*kHz3 – 0.06*kHz2 + 55.38*log10Hz2 – 449.4*log10Hz + 1.63*kHz + 918. These 7th and 8th columns are described below in the discussion of ‘controls’. The last column, dB Leq, shows the sound-pressure level of the acoustic prepulses integrated over the ISI [7]; spectrum level with no stimulus was 6 dB SPL leading to 52 dB in the 4 to 44 kHz bandwidth which is added in linear units to the pre-pulse and divided by the ISI to determine the amount of constant sound that would deliver the same total energy over the ISI as the auditory pre-pulse.

Ms	Cycles	Hz	ISI ms	μV rms	μG	Resonance μV rms	“dB(ML)”	dB (Leq)
4	2	500	200	49	2.5	0	−3	55
9	4	460	200	55	2.9	0	−2	5B
25	9	360	200	11B	6.1	.37	−1	64
45	10	220	150	ss1	17.2	.76	5	70