Scientists from Birkbeck College, London, have used
  the Geodesic Sensor Net to show that a baby's brain
  goes through a crucial stage of development between six
  and eight months of age, allowing them to "see" a
  well-known optical illusion. 

  When adults are shown "pacman" shapes arranged with
  their "mouths" open in four corners, their brains
  automatically register a square, even though the shape
  itself does not actually exist. Babies younger than six
  months are unaware of the square, yet at eight months
  they have acquired the cerebral "software" to register
  the four corners and so "see" a four-sided shape. 

  A team led by Gergely Csibra, a psychologist, used the
  sensor net to show in a study published in the journal
  Science that this stage of development is accompanied
  by the emission of certain brain-waves called gamma
  oscillations. The electrical activity of the brains of babies
  younger than six months does not include gamma
  oscillations, but by eight months they can be registered
  when the brain is performing the task of identifying an
  object from its constituent shapes. 

  By Steve Connor, Science Editor 
  24 November 2000
  The Independent - English broadsheet
                                 
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              FURTHER REFERENCES

  GO - "search perceptions" - in SEARCH-ENGINE


file-ID www.perceptions.couk.com/wire-up.txt