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The purpose of this thesis was to investigate a
proposed neurophysiological model for Necker cube reversals
by using electroencephalography. It is suggested that
Necker cube reversals are mediated by sustained focused
attention to the overall drawing with visual selective
attention to vertices of the cube. The main hypotheses were
that deliberate attention would increase Necker cube
reversals over passive attention, there would be greater
high theta power during the deliberate focusing of attention
than during passive attentional processing, and there would
be greater theta power in the right hemisphere.
Thirty undergraduate psychology students had monopolar
EEG recorded bilaterally from frontal and parietal electrode
sites. The subjects viewed computer presentations of the
Necker cube under two different experimental conditions: a
passive condition in which they were not instructed to
influence reversals, and an active condition in which
subjects deliberately shifted their focus of attention.