How many dots at the intersections are black?

10%
25%
50%
None
In this scin­til­lat­ing grid il­lu­sion, dark dots seem to appear and dis­ap­pear ran­dom­ly. Various theories have been proposed to explain it. It may be caused by the mech­a­nism of lateral in­hi­bi­tion (the capacity of an excited neuron to reduce the activity of its neigh­bors).

Answers distribution

10%
25%
50%
None
answers
flagthe United Arab Emirates
0%
0%
0%
100%
20
flagUnknown
1%
2%
4%
90%
410
flagSpain
0%
4%
4%
90%
22
flagGermany
0%
0%
8%
89%
146
flagNorway
0%
0%
6%
89%
29
flagDenmark
0%
10%
0%
89%
19
flagAustralia
0%
2%
8%
88%
36
flagthe United Kingdom
1%
1%
7%
86%
366
flagPoland
1%
3%
7%
85%
12241
flagFrance
2%
5%
7%
84%
38
flagItaly
0%
0%
15%
84%
26
flagRepublic of Ireland
4%
2%
10%
82%
47
flagCanada
3%
1%
11%
81%
54
flagthe United States
1%
3%
8%
80%
827
flagPakistan
0%
5%
5%
77%
18
flagIndia
2%
3%
12%
74%
203
flagMalaysia
0%
10%
10%
73%
19
flagRussia
3%
3%
7%
71%
28
flagthe Netherlands
2%
7%
16%
69%
42
flagthe Philippines
0%
0%
10%
65%
20

Gender

men89%
women88%
10%
1%
0%
25%
2%
2%
50%
6%
8%
None
89%
88%

Details

Author: Steve Lamberty
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