Table 1.

Inclusion criteria for subset

Group	% Freezing during acclimation	% Freezing before probes, difference post–pre	Startle amplitude, difference post–pre
CTRL	Pretest ≤25%	Noise alone ≤0%	Noise alone ≤50
	Difference post–pre ≤0%	Tone–noise ≤0%	Tone–noise ≤50
ANX	Pretest ≤25%	Noise alone ≥10%	Noise alone ≥50
	Difference post–pre ≥10%
FEAR	Pretest ≤25%	Tone–noise ≥10%	Tone–noise ≥50
	Difference post–pre ≤25%