catherine miami conference powerpoint

8/13/2019 Catherine Miami Conference Powerpoint..

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The non-linear dynamic of Visual Search Task

Catherine Schneider

Samantha HindsSamantha Linsky

Alexandra Matthews

Allison Stewart

Heidi Kloos


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General Outline

1) Introduction Attention to Local vs. Global Features

How are the attentional processes coordinated?

Fractal as a measure of coordination

) !ethods and results

") #onclusion and $iscussion


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Attention to Local vs. Global Features

Another %&ample'

(imchi et al.* ++,)


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Fractal as a measure of

coordination


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In a variet- of tass have been found fractal or/ani0ation.

Motor tasks (e./.* walin/* tappin/* or sensorimotor s-nchroni0ation).(Gilden* ++12 3an Orden* Holden 4 5urve-* ++,).

Cognitive tasks (e./.* word reco/nition* speech production* time

estimation* mental rotation). (ello 4 3an Orden* ++6)

Perceptual tasks (e./.* visual search). (Gilden* ++12 !cIlha//a* ++7)

Fractal as a measure of

coordination


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Methods

Participant

21 undergraduate students, 18-4 years

!M" 21#4, SD" 8#1$ 28 children, %- years !M" &, SD"

1#'2$


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Procedure:

(andomi)ed configuration of stimuli ranging *et+een

4 elements elements 1& elements

.ne of the stimuli /aried either *y

Shape of the stimuli 0ifferent elements

1&8 trials generated !84 different, 84 identical$

ssem*led into eight consecuti/e *locks

1,44 trials administrated on 13 0ell flat panel monitor !dults$

&2 trials administrated on 1&3 0ell laptop !hildren$


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(esult

0.60

0.65

0.0

0.5

0.!0

0.!5

0."0

0."5

#.00

$ " #6

ProportionofCorrectAnswers Number of Elements

Visual Search Adults

%i&&erent Sha'e same elements Same Sha'e di&&erent elements

0.60

0.65

0.0

0.5

0.!0

0.!5

0."0

0."5

#.00

$ " #6

ProportionofCorrectAnswers

Number of Elements

Visual Search Children

%i&&erent Sha'e same elements Same Sha'e di&&erent elements

''

12''

1''

22''

2''

4 - 1&AverageReactionTime(ms)

Number of Elements

Visual Search Adults

0ifferent Shape same elements Same Shape different elements

''

12''

1''

22''

2''

4 - 1&

AverageReactionTime(ms) Number of elements

Visual Search Children

0ifferent Shape same elements Same Shape different elements


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5ractal

'#4'

'#%'

'#&'

'#'

'#8'

'#'

1#''

hildren dults

6urst78ponent!051$

5ractal coordination of Visual Search

.*ser/ed (andomi)ed-Shuffle


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onclusion (eaction times /isula search task has self-similarity that resem*le

the fractal structure in the other cogniti/e tasks# Pre/ious studies

ha/e sho+n the eistence of 19f noise in the perception of re/ersi*le

figures !ks : Sprott, 2''; ks, ased on these prior studies and our results, it is possi*le to

con?ecture that during the process of detecting glo*al and local

elements, a ne+ dynamic coordination emerges, and that this ne+

pattern could not *e completely descri*ed as separate components#The long-range correlation *et+een trials, demonstrate that such a

coordinati/e process is per/asi/e to the /isual processing#

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