Report 8/28
Goal:
Brainwave spectrum emmitted while watching flicker translated into sound.
Set-up:
test subject-asian american female
IBVA
Madrid flicker video sample
MAX interface
SuperCollider to emulate sounds using algorithmic functions
*Test A
emulation of spectrum detected by volume level changes in pink noise
Result:
-slight building of pressure in head
-very slight nausea
-changes in noise level in sync with horizontal lines moving across the screen
*Test B
set pitch to follow the dominant frequency of spectrum
Result:
-pitch changes with frequency of eye movements
-little change in sound
*Test C
set beat to follow dominant frequency without eye movement. set ground
frequency to constant of 200 hz. Beat frequency 200 - 460 hz.
Note*change in test subject to australian male*
-subject fell asleep
-little to no brainwave activity
-little change in sound
Conclusion:
Changes in frequency levels too slight to create dynamic sound range.
Increase in activity of observer may create sufficient levels for more
interesting sounds results.
* Flicker is not perceptible at frequencies of about 100 flashes per second, but it nevertheless affects firing of cells in the retina and subcortical structures.
-Berman, Greenhouse, Bailey, Clear, and Raasch. Human electroretinogram responses to video displays, fluorescent lighting and other high frequency sources.
* Heart rate is increased when fluorescent lighting flickers impercetibly.
-Watts and Wilkins. The role of provocative visual stimuli in agoraphobia.
Psychological Medicine.
