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

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Presentation transcript:

Treisman Visual Search Demo

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

Find the T

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

Find the Blue Letter 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 L L L L L L L L

Both are equally fast: Feature Search (blue)

Find the vertical T

Both are equally fast: Feature Search (vertical line)

Find the vertical T

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

Find the Blue L L L L L L T T T T T

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

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

What’s Going On? Number of Items RT Conjunction Feature