jobb fÉlteke dominancia a vizuÁlis statisztikus tanulÁs kezdŐfÁzisÁban
DESCRIPTION
JOBB FÉLTEKE DOMINANCIA A VIZUÁLIS STATISZTIKUS TANULÁS KEZDŐFÁZISÁBAN. József Fiser, Matthew E. Roser *, Richard N. Aslin # & Michael S. Gazzaniga * Brandeis University, University of Rochester # and Dartmouth College*. Great diversity of proposed hemispheric specializations. - PowerPoint PPT PresentationTRANSCRIPT
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JOBB FÉLTEKE DOMINANCIA A VIZUÁLIS
STATISZTIKUS TANULÁS KEZDŐFÁZISÁBAN
József Fiser, Matthew E. Roser*, Richard N. Aslin# & Michael S.
Gazzaniga*
Brandeis University, University of Rochester# and
Dartmouth College*
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Great diversity of proposed hemispheric
specializations
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Hemispheric differences in object perception
•For highly familiar objects:
RH metric and positional information LH abstract categorical information •RH visual form information LH conceptual associations
•RH early information (low SF) LH late information (high SF)
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Object perception requires visual feature learning
•First, visual scenes are interpreted via already learned object features
•Next, search for new specific spatial co-occurrences and new arrangements among elements (emergence of new feature combinations) occurs•Finally, explicit access to a new feature by developing associations and categorical and semantic meaning
Right hemisphere
Left hemisphere
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Question:
Can the process of learning new
visual features be linked to
differential involvement of the
two brain hemispheres?
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Six base-pairs
Fit three base-pairs into 3 X 3 grid
The basic paradigm
Visual feature = spatio-temporal conjunction of separate shapes
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Testing phase
• 2AFC task• Base-pair vs. Non-base pair
A
B
E
F
I J
A
B
Base-pair Non-base pairs
IF
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Split the base-pairs
Modifying the paradigm
GHC
D
K L
A
B
F
E
I J
2 deg
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Modified test phase
Ipsilateral:
• Practice: RH Test: RH• Practice: LH Test: LH
Contralateral:
• Practice: RH Test: LH• Practice: LH Test: RH
Four lateralized test types
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Subjects
• Normal subjects: Sixteen college students
• Callosotomy patient: V. P.
(Corballis et al. Neurology 2001)
SpleniumRostrum
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Experimental procedure for normal subjects
Practice:
•144 scenes alternating randomly between the right and left visual fields
•Eye-movements monitored by iView to verify fixation (and hemifield stimulation)Test:
•Six test trials in each of the four test types (Ipsi, Contra) x (RH, LH)
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Results with normal subjects
Equal learning in all conditions interhemispheric transfer
40
50
60
70
80
90
100
40
50
60
70
80
90
100
Practice: RH LH LH RH
Test: RH LH RH LH
Normal
Ipsilateral Contralateral
Chance
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V.P.'s testing schedule
1st day: practice
2nd day: practice, ipsilateral tests, practice,
ipsilateral tests
3rd day: practice, ipsilateral tests, practice,
ipsilateral tests
4th day: practice, contralateral tests
5th day: practice, contralateral tests
Data collection in five days
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40
50
60
70
80
90
100
40
50
60
70
80
90
100
Practice: RH LH LH RH
Test: RH LH RH LH
Normal
Split brain
Ipsilateral Contralateral
•Contralateral: No interhemispheric
information transfer•Ipsilateral: Strong right hemisphere advantage
*
Chance
Results with the split brain patient
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Conclusions
•The initial phase of extracting spatial statistical regularities from the visual input is dominated by right hemisphere processes
•These results predict a shift of relative brain activity from the right to the left hemisphere as visual perception shifts from naïve observation to a knowledge-based interpretation of the scene
•Visual statistical learning does not transfer across split hemispheres even when some limited transfer of higher-level word-related information is possible