Intro arrow 15. Different Theories
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0. Left & Right Brain
1. Masking Alpha Channel
2. Rods & Cones
3. LGN: Magno & Parvo
4. SC: Superior Colliculus
5. Primary Visual Cortex
6. Dorsal - Ventral Stream
7. Eye Movements
8. Oculomotor System
9. Balance System
10. Ectopia & Microgyrus
11. Genetic Etiology
12. Reading
13. Animals
14. Conclusion / Solution
15. Different Theories
16. Peace of Mind
15.1 P-type / perceptual and L-Type / linguistic (Dirk J. Bakker)

"Neurolinguistic differentiation of children with subtypes of dyslexia. A detailed analysis of the types of childhood dyslexia proposed by Boder (1973) and Bakker (1990) revealed characteristic patterns of organization of intellectual functions, of hemispheric specialization, and of reading errors in right-handed children with dyslexia. Children with L-type dyslexia (10 subjects) evidenced a large number of reading errors (e.g., substitutions of nouns and verbs), low scores in verbal short-term memory, and right-ear advantage (REA) in dichotic listening. Children with P-dyslexia (18 subjects) evidenced few reading errors, a short ..."

Source: Journal of Learning Disabilities - Masutto, Cristina-Bravar, Laura-et al (October 1, 1994) - exact link

Info at BDA: Paper by Jean Robertson and Mike Johnson link

Book: Neuropsychological Treatment of Dyslexia (Dirk J. Bakker) Amzon

Reflection of "The Alpha-Channel" on this Theory:

When we look at the Dyslexics and Image Processing / Reading -topic and compare them to Bakker's subtypes:


1. Dyslexics with Gap (Dg) resemble the profile of P-type (perceptual) Dyslexics: accurate but slow and fragmented reading.

2. Dyslexics with Blur (Db) have the same profile as L-type (Linguistic) Dyslexics: hurried, inaccurate reading.


The purpose of this site is to present questions and new ideas about the above subjects.

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