Gain–frequency relationships of L2–3 PNs depend on the stimulus. A–C, Top row shows the power spectrum of each noise stimulus for σ_I = 0.25 nA. Bottom row shows average G(f), with I_DC and/or σ_I adjusted to obtain r₀ ≈ 10 Hz. D, Peak frequency of primary resonance, showing a higher value for 1/f noise. Asterisks in D, F, and G indicate that there was a significant difference between stimuli, based on a single-factor ANOVA, and the measure for the indicated stimulus differed significantly from the corresponding measure for both other stimuli, based on post hoc t tests with Bonferroni's correction factor. E, Strength of primary resonance. F, Peak frequency of high-frequency resonance, showing a higher value for 5 ms exponential-filtered noise. G, Strength of high-frequency resonance, which was also greatest for 5 ms exponential-filtered noise. *p < 0.05.