This is taken from the revised "Personality Types" by Don Riso and Russ Hudson
Observe everything with extraordinary perceptiveness and insight. Are mentally alert, curious, have a searching intelligence: nothing escapes their notice. Display foresight and prediction abilities. Able to concentrate: become engrossed in what has caught their attention. / Attain skillful mastery of whatever interests them. Excited about knowledge: often become expert in some field. Innovative and inventive, producing extremely valuable, original works. Highly independent, idiosyncratic, and whimsical. At Their Best: Become visionaries, broadly comprehending the world while penetrating it profoundly. Open-minded, take things in whole, in their true context. Make pioneering discoveries and find entirely new ways of doing and percieving things.
Average: Begin conceptualizing everything before acting - working things out in their minds: model building, preparing, practicing, gathering resources. Studious, acquiring technique. Become specialized and often "intellectual": involvement in research, scholarship, and building theories. / Increasingly detached as they become involved with complicated ideas or imaginary worlds. Become preoccupied with their visions and interpretations rather than reality. Are fascinated by offbeat, esoteric subjects, even those involving dark and disturbing elements. Detached from the practical world, a "disembodied mind", although highly strung and intense. / Begin to take an antagonistic stance towards anything which would interfere with their inner world and personal vision. Become provocative and abrasive, with intentionally extreme and radical views. Cynical and argumentive.
Unhealthy: Become reclusive and isolated from reality, eccentric and nihilistic. Highly unstable and fearful aggressions: they reject and repulse others and all social attachments. / Get obsessed with yet frightened by their threatening ideas, becoming horrified, delirious, and prey to gross distortions and phobias. / Seeking oblivion, they may commit suicide or have psychotic break from reality. Deranged, explosively selfdestructive, with schizophrenic overtones.
Key Motivations: Want to be capable and competent, to master a body of knowledge and skill, to explore reality, to remain undisturbed by others, to reduce their needs.