Table 1. List of channels in which initial dip has been detected.

Subjects	Tasks	Channels		Subjects	Tasks	Channels
1	Mental arithmetic	2, 4, 8, 9, 10, 11		5	Mental arithmetic	2, 3, 4, 10, 11, 12
	Mental Counting	2, 4, 6, 8, 10, 11, 12			Mental Counting	2, 4, 8, 10, 11, 12
	Puzzle solving	2, 3, 4, 8, 11			Puzzle solving	1, 2, 3, 4, 7, 8, 10, 11, 12, 16
2	Mental arithmetic	3, 4, 8, 9, 10, 11		6	Mental arithmetic	2, 4, 8, 10, 11
	Mental Counting	2, 7, 9, 10, 11, 15			Mental Counting	4, 8, 10
	Puzzle solving	2, 3, 4, 8, 9, 10, 11, 12			Puzzle solving	2, 4, 8, 10, 11, 12
3	Mental arithmetic	2, 3, 4, 7, 8, 9, 10, 11, 16		7	Mental arithmetic	4, 8, 10, 12, 16
	Mental Counting	2, 3, 4, 7, 8 10, 11, 12			Mental Counting	4, 5, 6, 10, 11, 12
	Puzzle solving	2, 3, 7, 8,10, 11, 15			Puzzle solving	2, 3, 4, 10
4	Mental arithmetic	2, 3, 6, 7, 10, 11		8	Mental arithmetic	4, 8, 10, 11, 16
	Mental Counting	3, 5, 7, 8, 11, 13, 15			Mental Counting	4, 8, 10, 16
	Puzzle solving	2, 3, 4, 8, 10, 16			Puzzle solving	1, 2, 3, 4, 10, 11, 12