Table 1.

Results of statistical tests

Test/comparisonFigureAreas ComparedP Value Obtained with Full Data SetP Value with Boundary-Adjacent Units DroppedDifferenceP Value with Monkey B DroppedDifference
Frequency PI for PT3ANOVA6.4 × 10−67.4 × 10−60.00036
A1 vs. CM0.0480.170.042
A1 vs. CL2.4 × 10−62.6 × 10−60.00025
CM vs. CL0.0480.0150.46
Frequency PI for ⅓-oct BPN3ANOVA0.000143.4 × 10−50.0044
A1 vs. CM0.0190.0470.038
A1 vs. CL8.0 × 10−51.0 × 10−50.0054
Frequency PI for 1-oct BPN3ANOVA0.0320.0110.12
A1 vs. CL0.0310.00720.19
Linear discriminator performance for PT3ANOVA0.000390.000630.00025
A1 vs. CL5.2 × 10−50.000145.9 × 10−5
Linear discriminator performance for ⅓-oct BPN3ANOVA0.000520.000680.0010
A1 vs. CL5.3 × 10−56.2 × 10−50.00019
CM vs. CL0.00950.0130.023
Linear discriminator performance for 1-oct BPN3ANOVA2.7 × 10−54.3 × 10−52.3 × 10−5
A1 vs. CL1.1 × 10−61.5 × 10−63.7 × 10−6
CM vs. CL0.010.00970.04
Number of peaks in frequency-rate curve, PT3ANOVA0.000830.000400.0021
A1 vs. CM0.00710.00810.007
A1 vs. CL0.00150.000620.0071
Number of peaks in frequency-rate curve, ⅓-oct BPN3ANOVA0.0290.0480.014
A1 vs. CM0.0330.160.014
Stimulus PI for MC4ANOVA0.0160.0180.011
A1 vs. CL0.0590.024+0.094
A1 vs. CM0.0560.280.021+
Stimulus PI for ES4ANOVA0.0170.0610.026
A1 vs. CL0.0410.10.05
Linear discriminator performance for MC4ANOVA1.2 × 10−51.9 × 10−59.2 × 10−6
A1 vs. CM0.0130.0140.0063
A1 vs. CL1.5 × 10−52.8 × 10−51.8 × 10−5
Linear discriminator performance for ES4ANOVA2.2 × 10−51.7 × 10−54.6 × 10−5
A1 vs. CL1.5 × 10−56.3 × 10−64.2 × 10−5
CM vs. CL0.000980.00110.0023
Azimuth PI, best PT6ANOVA0.0170.00150.018
A1 vs. CL0.00870.000920.0087
CM vs. CL0.310.017+0.4
Azimuth PI, best ⅓-oct BPN6ANOVA0.0340.00730.066
A1 vs. CL0.0350.00840.13
CM vs. CL0.0960.023+0.11
Azimuth PI, WN6ANOVA0.0170.000220.017
A1 vs. CL0.0380.00190.038
CM vs. CL0.0270.000270.027
Elevation PI, best 1-oct BPN6ANOVA0.0120.0140.027
CM vs. CL0.00850.0130.017
Elevation PI, wide band averaged6ANOVA0.0190.0230.071
CM vs. CL0.0180.0180.075
Latency7ANOVA5.1 × 10−142.4 × 10−132.2 × 10−12
A1 vs. CM4.1 × 10−137.1 × 10−132.6 × 10−12
CM vs. CL1.7 × 10−91.5 × 10−81.7 × 10−7
Latency-best frequency correlation7A15.4 × 10−65.4 × 10−61.8 × 10−5
r = −0.364r = −0.364r = −0.386
CM0.440.390.58
r = −0.076r = −0.091r = −0.061
CL0.100.100.10
r = −0.179r = −0.202r = −0.179
Linear discriminator best window, all stimuli8ANOVA1.2 × 10−91.0 × 10−72.5 × 10−7
A1 vs. CM0.000890.000390.0010
A1 vs. CL0.00100.0210.046
CM vs. CL2.2 × 10−92.8 × 10−75.6 × 10−7
Correlation between acoustic structure and firing rate, ES9ANOVA0.0190.0390.053
CL vs. CM0.0210.040.067
  • Values are results of statistical tests with units adjacent to the caudomedial (CM)/caudolateral (CL) boundary dropped to test against uncertainty of the boundary location, or with units recorded from monkey B dropped, compared to results obtained with the full data set. Except for latency-best frequency (BF) correlations, all P values are for pairwise comparisons between areas by t-test and corrected for multiple (3) comparisons with Šidak correction, or for ANOVA comparing all 3 areas. Analyses resulting in nonsignificant P value (P ≥ 0.05) for both full data set and with units dropped are not shown (except for latency-BF correlations). Difference is coded as “+” when dropping the units changed the P value from nonsignificant to significant and as “−”' when it changed the P value from significant to nonsignificant. For latency-BF correlation, r values are also provided.

  • PI: preference index; PT, pure tones; BPN, band-pass noise; MC, monkey calls; ES, environmental sounds; WN, white noise.