Transcript Reading in the Brain

Reading in the Brain
Jakob Heinzle (Berlin) and Kevan
Martin and K.H. (Zürich)
Outline
• Tutorial on the functional neuroanatomy of
vision and eye-movements.
• Microcircuit model of the frontal eye fields.
• Biologically realistic cortical model of eye
movement control in reading.
• Work in progress.
Cortex (man, left hemisphere)
Cortex (macaque, left hemisphere)
Visual areas in the macaque cortex
Neurons in the feline primary visual
cortex V1
Microcircuit in V1
Eye muscles and motoneuron
Descending pathways for saccades
Reading enlarges the language
representation in the cortex
Eye movements during reading
FEF model for saccades
Complete network architecture
Interactions: B excitatory, A inhibitory
MathBox
Network activity for a visual saccade
More complex saccade tasks are
successfully implemented
FEF model naturally incorporates
reading
FEF model during reading
Implementation of the reading rule
Normal reading and word skipping
Reading statistics
Error statistics
Question: what happens in the brain
„behind the eye“during reading ?
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Many unsolved problems: Language,
consiousness
Simplification in the world of text processing:
Reading imbedded in sensorimotor actions
Copy-Paste between a Pdf-file and a Powerpoint
slide: Instructions
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Click on the Adobe buttom. Go to the page containing Figure 1. Enlarge
the image, by clicking on the arrow on the right of the white window and
selecting 100%. Center the image.
Click on ‚Werkzeuge‘ on the second Adobe control bar. Move to
‚Auswählen und Zoomen‘ and follow the arrow into the context window
down to ‚Schnappschuss-Werkzeug‘.
Move the cross of the pointer to the left upper corner of Figure 1. Press
the left mouse buttom, move it to the right lower corner and let go.
Change to Powerpoint,by clicking on its control buttom. Point into the
slide and type ‚Ctrl+V‘. Click into Figure 1 and center it in the content
field. Type ‚Architecture of the FEF model‘ in the title field.
Click on ‚Neue Folie‘. Move to Adobe Click on the ‚Single Page‘ button on
the upper control bar and go to the page containing Figure 2. Repeat the
same steps, without having to change again into the ‚SchnappschussWerkzeug‘.
Nur jedem das Seine (BWV 163)
Nur jedem das Seine!
Muss Obrigkeit haben
Zoll, Steuern und Gaben,
Man weigre sich nicht
Der schuldigen Pflicht!
Doch bleibet das Herze dem Höchsten alleine.
Gott soll allein mein Herze haben
(BWV 169)
Stirb in mir,
Welt und alle deine Liebe,
Dass die Brust
Sich auf Erden für und für
In der Liebe Gottes übe;
Stirb in mir,
Hoffahrt, Reichtum, Augenlust,
Ihr verworfnen Fleischestriebe!
Pointers
• J Heinzle, K Hepp, K Martin „A microcircuit model
of the frontal eye fields“. J Neuroscience 27:9341
(2007).
www.ini.uzh.ch/~jakob/code/FEF_Demo.zip
• J Heinzle, K Hepp, K Martin „A biologically
realistic cortical model of eye movement control
in reading“. Psychological Review 117:808 (2010).
www.ini.uzh.ch/~jakob/code/FEF_READ.zip
• Folien: [email protected]