The visual demonstration link below, after the Reference list, illustrates our mind's ability to shift from right brain (emotional) or left brain (logical) dominance:

Copy and paste any URL's or links below into your browser to view.

Our right hemisphere sees the world more as it really is. The left hemisphere suppresses sensory information that conflicts with what it believes "ought" to be. Paul Valent discusses this issue, and its implications for trauma therapy, in a presentation on the right brain as a substrate for reforging psychoanalytic and trauma therapies.

References:

Bonneh, Y. S. et al. (2001). Motion-induced blindness in normal observers. Nature, 411, 798-801. (Letters).

Funk & Pettigrew (2003). Does interhemispheric competition mediate motion-induced blindness? A transcranial magnetic stimulation study. Perception, 32, 1328-1338.

Valent, P. (2001). The right brain as a substrate for reforging psychoanalytic and trauma therapies. Presented at the ASTSS/NCPTSD Annual Conference, Canberra, Australia. March 2001.

The Motion Induced Blindness illusion was discovered by Yoram Bonneh. Work by Jack Pettigrew at University of Queensland suggests that this illusion results from a rivalry for dominance between the left and right hemispheres at the parietal lobe. When the right hemisphere is dominant, you see the yellow dots; when left hemisphere gains dominance, the yellow dots disappear.

Copy and paste the following into your browser:

http://www.michaelbach.de/ot/mot_mib/

What to see

"On the right you see a rotating array of blue crosses and 3 yellow dots. Now fixate on the centre (watch the flashing green spot). Note that the yellow spots disappear once in a while: singly, in pairs or all three simultaneously. In reality, the 3 yellow spots are continuously present, honest!"