1. The Flanker Task
A Demonstration

2. What you’re about to see is a quick depiction of how the Flanker Task was conducted. Each subject participated in the experiment in blocks of 32 trials. The subject was asked to first focus their attention on a fixation point, affixed a ½ degree below the target letter yet to be presented, and after a delay of 1 second, the target letter appeared, either alone or with a series of “flanker” letters. The subject was asked to identify whether the target letter was an H or K, S or C, by pressing a left or right lever. The subjects’ responses were timed, and upon the identification of the target letter, a new trial would begin.

3. ●

4. S ●

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6. C ●

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8. H ●

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10. K ●

11. ●

12. SSSSSSS ●

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14. CCCCCCC ●

15. ●

16. KKKKKKK ●

17. ●

18. HHHHHHH ●

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20. SSSCSSS ●

21. ●

22. KKKCKKK ●

23. ●

24. HHHSHHH ●

25. ●

26. CCCHCCC ●

27. ●

28. SSSKSSS ●

29. ●

30. WWWSWWW ●

31. ●

32. JJJKJJJ ●

33. ●

34. GGGHGGG ●

35. ●

36. MMMCMMM ●

37. ●

38. NNNSNNN ●

39. ●

40. SSSCSSS ●

41. ●

42. HHHKHHH ●

43. ●

44. CCCSCCC ●

45. ●

46. KKKHKKK ●

47. ●

48. CCCCCCC ●

49. ●

50. GGGHGGG ●

51. ●

52. SSSKSSS ●

53. ●

54. KKKCKKK ●

55. ●

56. MMMSMMM ●

57. ●

58. HHHHHHH ●

59. ●

60. GGGKGGG ●

61. ●

62. QQQSQQQ ●

63. ●

64. NNNKNNN ●

65. ●

66. GGGCGGG ●