Table 1.

Mean (SD) HbO and HbR responses during the test events. (a) and (b) Experiment 1, one sample t-tests comparing HbO and HbR responses (averaged over 6 to 20s) to zero for each channel. One-way ANOVAs tested for differences between groups for each channel. Follow-up comparisons, using independent samples t-tests, were performed for those channels in which a significant effect was obtained (c) and (d) Experiment 2, one sample t-tests comparing mean HbO and HbR responses (averaged over 7s to 24s) to zero. One-way ANOVAs tested for differences between groups. Follow-up comparisons, using independent samples t-tests, were performed for those channels in which a significant effect was obtained.

EXPERIMENT 1 HBO		ONE SAMPLE T-TESTS M (SD)			ONE-WAY ANOVA (DF = 51)	INDEPENDENT SAMPLES T-TESTS (DF = 34)
Neural Region	Channel	Shape Difference N = 18	Color Difference N = 18	Control N = 18	Between Subjects Effects	Shape vs. Control	Color vs. Control
T3	1	.0025 (.006)	−.00004 (.004)	− .0002 (.003)	F = 2.12
	2	.0023 (.004) ^*	.0021 (.009)	− .0012 (.006)	F = 1.53
	3	.0048 (.006) ^**	.0014 (.007)	− .00001 (.004)	F = 3.44 ^*	t = 2.86 ^**	t < 1
T5	4	.0058 (.007) ^**	.0040 (.007) ^*	.0033 (.006) ^*	F < 1
T5	5	.0042 (.007) ^*	.0067 (.010) ^*	.0036 (.006) ^*	F < 1
P3	6	.0025 (.007)	.0018 (.010)	−.0027 (.007)	F = 2.22
P3	7	−.0006 (.007)	.0006 (.008)	− .0002 (.007)	F < 1
01	8	.007 (.011) ^**	.0046 (.006) ^**	.0068 (.010) ^**	F < 1
01	9	.007 (.011) ^**	.0068 (.009) ^**	.0077 (.012) ^**	F < 1
EXPERIMENT 1 HBR		ONE SAMPLE T-TESTS M (SD)			ONE-WAY ANOVA (DF = 51)	INDEPENDENT SAMPLES T-TESTS (DF = 34)
Neural Region	Channel	Shape Difference N = 18	Color Difference N = 18	Control N = 18	Between Subjects Effects	Shape vs. Control	Color vs. Control
T3	1	−.0009 (.002)	.0004 (.003)	.0002 (.002)	F = 1.5
	2	−.0023 (.002) ^***	− .0046 (.002)	.0002 (.004)	F = 2.16
	3	−.0020 (.003) ^**	−.0014 (.003)	−.0004 (.006)	F < 1.5
T5	4	−.0012 (.003)	−.0016 (.003) ^*	−.0010 (.003)	F < 1
T5	5	−.0019 (.003) ^*	−.0019 (.003) ^*	−.0018 (.004) ^*	F < 1
P3	6	.00002 (.003)	.0002 (.004)	.0009 (.003)	F < 1
P3	7	−.0009 (.003)	−.0001 (.004)	.0010 (.005)	F < 1.5
O1	8	−.0020 (.003) ^*	−.0009 (.003)	−.0017 (.002) ^*	F < 1.5
O1	9	−.0021 (.003) ^*	−.0021 (.005)	−.0022 (.003) ^*	F < 1
EXPERIMENT 2 HBO		ONE SAMPLE T-TESTS M (SD)			ONE-WAY ANOVA (DF = 51)	INDEPENDENT SAMPLES T-TESTS (DF = 34)
Neural Region	Channel	Speed Discontinuity N = 18	Path Discontinuity N = 18	Control N = 18	Between Subjects Effects	Speed vs. Control	Path vs. Control
T3	1	− .0009 (.002)	.0015 (.003) ^*	.0001 (.004)	F = 2.39
	2	− .0006 (.008)	.0014 (.005)	.0006 (.008)	F < 1
	3	.0049 (.008) ^*	.0047 (.007) ^**	− .0010 (.008)	F = 3.48 ^*	t = 2.21 ^*	t = 2.32 ^*
T5	4	.0052 (.006) ^**	.0072 (.008) ^***	.0044 (.008) ^*	F < 1
T5	5	.0071 (.007) ^***	.0050 (.009) ^*	.0031 (.006) ^*	F < 1.5
P3	6	.0043 (.008) ^*	.0028 (.009)	−.0027 (.009)	F = 3.25 ^*	t = 2.48 ^*	t = 1.83
P3	7	.0040 (.010)	.0060 (.006) ^***	− .0011 (.009)	F = 3.35 ^*	t = 1.67	t = 2.88 ^**
01	8	.0090 (.009) ^***	.0115 (.011) ^***	.0098 (.009) ^***	F < 1
01	9	.0111 (.010) ^***	.0133 (.013) ^***	.0093 (.011) ^**	F < 1
EXPERIMENT 2 HBR		ONE SAMPLE T-TESTS M (SD)			ONE-WAY ANOVA (DF = 51)	INDEPENDENT SAMPLES T-TESTS (DF = 34)
Neural Region	Channel	Speed Discontinuity N = 18	Path Discontinuity N = 18	Control N = 18	Between Subjects Effects	Speed vs. Control	Path vs. Control
T3	1	.0009 (.003)	− .0009 (.003)	−.0010 (.007)	F < 1
	2	− .0001 (.003)	− .0008 (.003)	−.0006 (.004)	F < 1
	3	−.0014 (.003)	−.0010 (.003)	−.0010 (.003)	F < 1
T5	4	−.0012 (.003)	−.0006 (.005)	−.0006 (.003)	F < 1
T5	5	−.0010 (.005)	.0002 (.004)	−.0013 (.003)	F < 1
P3	6	−.0009 (.004)	−.0012 (.004)	.0007 (.004)	F < 1.5
P3	7	−.0010 (.005)	−.0002 (.003)	−.0009 (.004)	F < 1
O1	8	−.0032 (.004) ^**	−.0023 (.003) ^*	−.0021 (.003) ^**	F < 1
O1	9	−.0035 (.003) ^***	−.0027 (.004) ^*	−.0010 (.003)	F = 2.59

In all cases

p < .05;

^**

p < .01;

^***

p < .001, two-tailed.