Effects of Surround Size and Luminance on Metacontrast*

Halsey H. Matteson

doi:10.1364/JOSA.59.001461

Journal of the Optical Society of America
Vol. 59,
Issue 11,
pp. 1461-1468
(1969)
•https://doi.org/10.1364/JOSA.59.001461

Effects of Surround Size and Luminance on Metacontrast

Halsey H. Matteson

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Halsey H. Matteson, "Effects of Surround Size and Luminance on Metacontrast*," J. Opt. Soc. Am. 59, 1461-1468 (1969)

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Abstract

The temporal course of reduction of test-stimulus effectiveness under conditions of metacontrast was studied with a suprathreshold brightness-matching procedure in which test-stimulus luminance was varied to maintain constant brightness. One purpose of this study was to determine the effects of surround diameter on the over-all amount of reduction of test-stimulus effectiveness. Two specific predictions concerning the effect of surround size on the temporal course of reduction of test-stimulus effectiveness were based on the notion of delays introduced in neural pathways mediating lateral inhibition. The typical metacontrast effect was obtained, i.e., maximum reduction of test-stimulus effectiveness occurred when the test stimulus preceded the surround by an appreciable interval. The amount of metacontrast increased with increasing surround diameter, but surround size had no consistent effects on the temporal course of reduction of test-stimulus effectiveness. Although the amount of metacontrast decreased with decreasing surround luminance, the stimulus-onset asynchrony at which maximum reduction occurred showed no consistent changes with decreasing surround luminance.

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Source of variation	df	HHM				RWH
Source of variation	df	PSE	Corrected PSE	PSEPOST	Difference Threshold	PSE	Corrected PSE	PSEPOST	Difference Threshold
Surround diameter (D)	2	44.3^a	75.4^a	18.0^a	1.88	0.151	2.49	6.56^a	0.891
Surround luminance (L)	3	193.7^a	142.4^a	39.4^a	20.6^a	171.9^a	139.4^a	49.4^a	7.95^a
SOA	8	26.4^a	28.8^a	2.20^b	3.11^a	24.8^a	28.4^a	4.94^a	6.12^a
Replications (R)	1	28.1^a	4.98^b	52.7^a	0.100	0.466	2.14	26.7^a	7.49^a
D×L	6	6.49^a	9.15^a	1.69	3.55^a	1.23	1.02	3.53^a	0.209
D×SOA	16	8.16^a	8.85^a	1.53	1.64	1.79	2.40^a	0.917	1.82
L×SOA	24	7.23^a	8.38^a	1.63	1.31	7.38^a	8.55^a	1.44	2.64^a
D×R	2	1.24	0.374	3.20^b	1.08	2.32	1.95	4.94^b	1.35
L×R	3	2.17	0.338	5.68^a	0.891	1.79	0.899	2.136	1.512
SOA×R	8	4.35^a	4.11^a	0.808	0.770	1.50	1.56	1.59	1.60
D×L×SOA	48	2.91^a	3.19^a	1.02	1.17	1.03	1.34	1.22	1.21
D×L×R	6	0.393	0.505	1.47	0.105	0.312	0.693	1.04	2.12
D×SOA×R	16	1.33	0.759	1.27	1.21	0.746	0.781	0.777	1.45
L×SOA×R	24	1.33	1.28	0.778	0.661	1.17	1.21	1.00	1.55
D×L×SOA×R	48	0.09019	0.08478	0.01686	0.00239	0.14215	0.10984	0.02166	0.00129
(Error mean square)	—
	215

Stimulus-onset asynchrony (SOA in msec)
		+100	+50	0	−25	−50	−75	−100	−150	−200
HHM	Between replications	0.198	0.365	0.218	0.342	0.243	0.382	0.740	0.553	0.215
	Difference threshold	0.113	0.110	0.100	0.115	0.133	0.128	0.157	0.144	0.124
RWH	Between replications	0.552	0.495	0.388	0.207	0.195	0.446	0.293	0.441	0.433
	Difference threshold	0.126	0.115	0.081	0.102	0.101	0.110	0.144	0.120	0.127

Source of variation	df	HHM				RWH
Source of variation	df	PSE	Corrected PSE	PSEPOST	Difference Threshold	PSE	Corrected PSE	PSEPOST	Difference Threshold
Surround diameter (D)	2	44.3^a	75.4^a	18.0^a	1.88	0.151	2.49	6.56^a	0.891
Surround luminance (L)	3	193.7^a	142.4^a	39.4^a	20.6^a	171.9^a	139.4^a	49.4^a	7.95^a
SOA	8	26.4^a	28.8^a	2.20^b	3.11^a	24.8^a	28.4^a	4.94^a	6.12^a
Replications (R)	1	28.1^a	4.98^b	52.7^a	0.100	0.466	2.14	26.7^a	7.49^a
D×L	6	6.49^a	9.15^a	1.69	3.55^a	1.23	1.02	3.53^a	0.209
D×SOA	16	8.16^a	8.85^a	1.53	1.64	1.79	2.40^a	0.917	1.82
L×SOA	24	7.23^a	8.38^a	1.63	1.31	7.38^a	8.55^a	1.44	2.64^a
D×R	2	1.24	0.374	3.20^b	1.08	2.32	1.95	4.94^b	1.35
L×R	3	2.17	0.338	5.68^a	0.891	1.79	0.899	2.136	1.512
SOA×R	8	4.35^a	4.11^a	0.808	0.770	1.50	1.56	1.59	1.60
D×L×SOA	48	2.91^a	3.19^a	1.02	1.17	1.03	1.34	1.22	1.21
D×L×R	6	0.393	0.505	1.47	0.105	0.312	0.693	1.04	2.12
D×SOA×R	16	1.33	0.759	1.27	1.21	0.746	0.781	0.777	1.45
L×SOA×R	24	1.33	1.28	0.778	0.661	1.17	1.21	1.00	1.55
D×L×SOA×R	48	0.09019	0.08478	0.01686	0.00239	0.14215	0.10984	0.02166	0.00129
(Error mean square)	—
	215

Stimulus-onset asynchrony (SOA in msec)
		+100	+50	0	−25	−50	−75	−100	−150	−200
HHM	Between replications	0.198	0.365	0.218	0.342	0.243	0.382	0.740	0.553	0.215
	Difference threshold	0.113	0.110	0.100	0.115	0.133	0.128	0.157	0.144	0.124
RWH	Between replications	0.552	0.495	0.388	0.207	0.195	0.446	0.293	0.441	0.433
	Difference threshold	0.126	0.115	0.081	0.102	0.101	0.110	0.144	0.120	0.127

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Journal of the Optical Society of America