“That,” Tarsedth said, “would be like expecting Diagnostician Conway to forgo all other-species surgery until it had first treated the Earth-human DBDGs in the hospital. Don’t be stupid, Lioren. Operating on an other-species patient is far more interesting and exciting than one of your own kind, and the more physiological differences there are the greater the professional challenge. But you know all this already. On Cromsag you treated—”
“There is no need to remind me of the results,” Lioren said sharply, irritated in spite of knowing that the other could not help being irritating. “I was about to say that Seldal, who has a beak and no arms, is showing no signs of mental confusion while its mind is partially under the control of a being accus- tomed to using six limbs all of which are capable of various degrees of manipulation. The psychological and emotional pressure, not to mention the input from its mind-partner’s involuntary muscle system, must be considerable.”
“Yes,” the Hudlar said. “Obviously it has good control of both minds. But I wonder how I, another six-limbed being, would feel if I had to take a Nallajim tape. I don’t have a beak equivalent or even a mouth.”
“Don’t waste time worrying about it,” Tarsedth said. “Educator tapes are only offered to those studious, highly intelligent, and emotionally stable types who are being considered for promotion to Senior Physician or higher. The way Cresk-Sar criticizes our work, can you imagine one of us ever being offered an Educator tape?”
Lioren did not speak. Much stranger things had happened in Sector General—the staff records showed that Thornnastor’s principal assistant, the DBDG Earth-human Pathologist Mur-chison, had joined the hospital as a trainee nurse—but it was a strict rule of the department that the subject of a long-term promotion should not be discussed with trainees who were being considered for it nor, except in the most general terms, any of the problems associated with the Educator-tape system.
The major problem from which all the others stemmed was that, while Sector General was equipped to treat every known form of intelligent life, no single entity could hold in its mind even a fraction of the physiological data necessary for this purpose. Surgical dexterity was a product of aptitude, training, and experience, but the complete information covering the physiology of a given patient could only be transferred artificially by Educator tape, which was the brain record of some great medical authority belonging to the same species as that of the patient to be treated.
If a Melfan doctor was assigned to a Kelgian patient, it was given a DBLF tape until the treatment was complete, after which the mind recording was erased. The exceptions to this rule were the Senior Physicians of proven emotional stability such as Sel-dal, and the Diagnosticians.
The Diagnosticians were those rare beings whose minds were stable enough to retain permanently six, seven, and in one case up to ten physiology tapes simultaneously. To these data-crammed minds were given the initiation and direction of orig- inal research in xenological medicine in addition to the practice and teaching of their considerable art.
The tapes, however, imparted not only the physiological data required for treatment, but the entire memory and personality of the donor entity as well. In effect a Diagnostician, and to a lesser extent a Senior Physician, subjected itself voluntarily to an extreme form of multiple schizophrenia. The donor entities apparently sharing the host doctor’s mind could be aggressive, unpleasant individuals—geniuses were rarely nice people—with all sorts of pet peeves and phobias. Normally these would not become apparent during the course of an operation or treatment because both host and donor minds were concentrating on the purely medical aspects of the work. The worst effects were felt when the possessor of the tape was sleeping.
Alien nightmares, Lioren knew from a few of his own tape experiences, were really nightmarish. And alien sexual fantasies were enough to make the host mind wish, if it was capable of wishing coherently for anything at the time, that it was dead. He could not even imagine the physical and emotional effect of the sensorium of an enormous, intelligent crustacean on the mind of a ridiculously fragile but equally intelligent bird.