A Study on Dyslexic Students in Holland


28 students (aged 13-17) were divided into three groups.

Group 1: 10 students diagnosed with dyslexia, receiving remedial education and auditory stimulation (Johansen IAS).

Group 2: 10 students diagnosed with dyslexia, receiving remedial education but without auditory stimulation.

Group 3: 8 non-dyslexic students.

The groups were matched on age, gender, I.Q., reading comprehension and mathematics/ calculation.

Significant differences were present between Groups 1 & 2 and Group 3 in technical reading (decoding) and spelling.


Group 1 students listened to individually customised Johansen IAS CDs for 10 minutes per day, 5 days a week over a period of 15 to 18 months.

A battery of assessments was carried out on all three groups before and after Group 1 received auditory stimulation (Johansen IAS) and again on Group 1 10 months after completion of the programme. The skills tested included:

  • Technical Reading (decoding)
  • Reading comprehension
  • Spelling
  • Writing/ Copying
  • Visual Memory
  • Auditory Memory
  • Phonemic Analysis
  • Rapid Naming
  • Pure-tone monaural and binaural listening audiometry
  • Dichotic listening

Parent and Student questionnaires were also completed


Immediately following Johansen IAS statistically significant improvements were seen in Group 1 compared to Group 2 and Group 3 students in:

  • Technical Reading
  • Spelling
  • Phonemic Analysis
  • Visual Memory
  • Rapid Naming
  • Audiometry

At follow-up 10 months later improvements were seen (some of which were statistically significant) in:

  • Reading comprehension
  • Writing/ copying
  • Auditory Memory

Parent and student questionnaires reported improvements in attention and coordination.


The results of this study support the belief that Johansen IAS can improve underlying skills which are often found to be weak in dyslexic students. Further studies with similar groups of students are ongoing.

We hope this study will be published in the not too distant future.

Contacting Johansen IAS:

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