Table 6.  Student t-values from planned contrasts testing for the presence of PPI (0 vs. 360-ms SOA) and refractoriness (60- vs. 360-ms SOA) on each component and each lead from the 7-lead PCA.

Recording Lead

Component

PPIa

(0- vs. 360-ms SOA)

Refractorinessa

(60- vs. 360-ms SOA

Fz

N19

P30

N40

P50

<1

<1

2.42*

3.47**

<1

<1

1.57

2.44*

Cz

N19

P30

N40

P50

<1

<1

3.55**

6.41**

<1

<1

3.62**

1.57

F8

N19

P30

N40

P50

<1

<1

3.05**

<1

<1

<1

3.28**

<1

T4/6

N19

P30

N40

P50

1.01

<1

<1

<1

1.18

<1

<1

<1

Masseter

N19

P30

N40

P50

<1

<1

1.18

<1

<1

<1

<1

1.48

Post-auricularis

N19

P30

N40

P50

1.89

<1

<1

1.76

1.01

<1

1.18

1.98

Medial frontalis

N19

P30

N40

P50

1.69

3.48**

5.59**

<1

<1

<1

4.58**

1.55

*p < .05. **p < .01.

adf=35.