I have reported here a few times that I have observed that patching one
eye appears to stimulate the opposite hemisphere because verbal
responses to questions seem to reflect left/right brain differences.
(http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstra
ct&list_uids=8258284
and http://www.cerebromente.org.br/n14/mente/lateralization.htm)

This effect is sometimes so strong, that it was hard to believe it had
never been reported scientifically.

I found this article for monocular viewing:

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1
1506536&dopt=Abstract

Toosy AT, Werring DJ, Plant GT, Bullmore ET, Miller DH, Thompson AJ.

NMR Research Unit, Institute of Neurology, Queen Square, London WC1N
3BG, United Kingdom.

We have demonstrated asymmetric activation patterns in the visual
cortices of normal humans who have undergone functional MRI with
monocular photic stimulation. The contralateral hemisphere is activated
more strongly and to a greater spatial extent than the ipsilateral
hemisphere when either eye is stimulated. This asymmetry can be
explained by nasotemporal asymmetries which have been described in
anatomical studies of the visual system in primates and humans. In
part, the representation of the monocular crescent of the temporal
hemifield of either eye, which exists only in the crossed projection,
may explain this. In addition, within the binocular field, there is a
biased crossed projection of nasal retinal ganglion cells which drive
the contralateral ocular dominance columns in V1. Finally, the blind
spot representation in the ipsilateral visual cortex may also
contribute to the observed asymmetries. Our study may in effect provide
a functional correlate of the anatomical asymmetries that have been
observed in humans and animals.

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And this article for viewing either left or right sides when wearing a
bi nasal patch. (Lateral stimulation).   But I just used a simple
patch.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstra
ct&list_uids=15246450

Lateral visual field stimulation reveals extrastriate cortical
activation in the contralateral hemisphere: an fMRI study.

Schiffer F, Mottaghy FM, Pandey Vimal RL, Renshaw PF, Cowan R,
Pascual-Leone A, Teicher M, Valente E, Rohan M.

Department of Psychiatry, Harvard Medical School, and the Developmental
Biopsychiatry Research Program, McLean Hospital, 115 Mill Street,
Belmont, MA 02478, USA. fschif@attbi.com

We examined whether lateral visual field stimulation (LSTM) could
activate contralateral extrastriate cortical areas as predicted by a
large experimental literature. We asked seven unscreened, control
subjects to wear glasses designed to allow vision out of either the
left (LVF) or right lateral visual field (RVF) depending upon which
side the subject looked toward. Each subject participated in a block
design functional magnetic resonance imaging (fMRI) study with
alternating 30-s epochs in which he was asked to look to one side and
then the other for a total of five epochs. On each side of the bore of
the scanner, we taped a photograph for the subject to view in the LVF
and RVF. The data were analyzed with SPM99 using a fixed effect,
box-car design with contrasts for the LVF and the RVF conditions. Both
LVF and RVF conditions produced the strongest fMRI activation in the
contralateral occipitotemporal and posterior parietal areas as well as
the contralateral dorsolateral prefrontal cortex. LSTM appears to
increase contralateral fMRI activation in striate and extrastriate
cortical areas as predicted by earlier studies reporting differential
cognitive and/or emotional effects from unilateral sensory or motor
stimulation.