Injecting a noise current in vitro is detrimental to correlations between burst and stimulus attributes. (a): plots of burst vs. stimulus attributes for an example pyramidal cell without noise injection. The panels show: burst ISI vs. amplitude, upper left; burst ISI vs. slope, upper right; burst length vs. amplitude, lower left; burst length vs. slope, lower right. (b): plots of bursts attributes versus stimulus attributes for an example cell with noise injection. The panels show: burst ISI vs. amplitude, upper left; burst ISI vs. slope, upper right; burst length vs. amplitude, lower left; burst length vs. slope, lower right. (c): Population averages (n=6) of the correlation coefficients without noise injection for each of the plots in panel A. (d): population averages (n=6) of the correlation coefficients for each of the plots in panel B. “*” indicates statistical significance at the P= 0.01 level using a signrank test