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Vision Research Vol. 21. pp. 749 to 750 0042-6989/81 I 050749-02502.00.0 Printed in Great Britain Pergamon Press Lid
 

Summary: 7 4 9
Vision Research Vol. 21. pp. 749 to 750 0042-6989/81 I 050749-02502.00.0
Printed in Great Britain Pergamon Press Lid
LETTER TO THE EDITORS
LOOKING AT THE WORLD THROUGH A
ROSE-COLORED GANZFELD
(Received 14 July 1990)
The recent exchanges between Walraven and Shevell
(Walraven, 1976, 1979; Shevell, 1978) led me to
wonder how visual stimuli would appear if viewed
against a colored ganzfeld. First, to review the dispute:
Walraven claims that a chromatic background is
"discounted" when a test stimulus is superimposed upon
it and that the background's only effect is to produce a
gain change--i.e. a von Kries transformation. Shevell
claims that Walraven's results only hold in special
conditions and that the general condition requires two
processes: the multiplicative process described above, as
well as an additive process whereby a signal from the
background is summed with that of the test (cf. Jameson

  

Source: Adelson, Edward - Computer Science and Artificial Intelligence Laboratory, Department of Brain and Cognitive Science, Massachusetts Institute of Technology (MIT)

 

Collections: Biology and Medicine