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Transcript of 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 $iscussion
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Attention to Local vs. Global Features
Another %&le'
(imchi et al.* ++,)
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Fractal as a measure of
coordination
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In a variet- of tass have been found fractal or/ani0ation.
Motor tasks (e./.* walin/* tappin/* or sensorimotor s-nchroni0ation).(Gilden* ++12 3an Orden* Holden 4 5urve-* ++,).
Cognitive tasks (e./.* word reco/nition* speech production* time
estimation* mental rotation). (ello 4 3an Orden* ++6)
Perceptual tasks (e./.* visual search). (Gilden* ++12 !cIlha//a* ++7)
Fractal as a measure of
coordination
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Methods
Participant
21 undergraduate students, 18-4 years
!M" 21#4, SD" 8#1$ 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#