1. Treisman Visual Search Demo

2. Visual Search Tasks  Can detect features without applying attention  But detecting stimulus conjunctions requires attention

3. Find the T

5. Both are equally fast: Feature Search (t-junction)

6. Find the Blue Letter L L L L L L L L

7. L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L

8. Both are equally fast: Feature Search (blue)

9. Find the vertical T

11. Both are equally fast: Feature Search (vertical line)

12. Find the vertical T

14. Reaction Time is slower and depends on the number of distractors Conjunction Search (vertical line + T-junction)

15. Find the Blue L L L L L L T T T T T

16. T L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L T T T T T T T T T T T T T T T T T T T T L

17. Reaction Time is slower and depends on the number of distractors Conjunction Search (blue + T- junction)

18. What’s Going On? 0 200 400 600 800 1000 1200 0102030 Number of Items RT Conjunction Feature