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By Root 278 0

order of precedence among them. For the protester, achieving a given political reform may be more important than anything else, life included. That one goal takes precedence over all others. Most people, however, adopt “sensible” goals based on the needs of their body—to live a long and healthy life, to have sex, to be well fed and comfortable—or on the desires implanted by the social system—to be good, to work hard, to spend as much as possible, to live up to others’ expectations. But there are enough exceptions in every culture to show that goals are quite flexible. Individuals who depart from the norms—heroes, saints, sages, artists, and poets, as well as madmen and criminals—look for different things in life than most others do. The existence of people like these shows that consciousness can be ordered in terms of different goals and intentions. Each of us has this freedom to control our subjective reality.

THE LIMITS OF CONSCIOUSNESS

If it were possible to expand indefinitely what consciousness is able to encompass, one of the most fundamental dreams of humankind would come true. It would be almost as good as being immortal or omnipotent—in short, godlike. We could think everything, feel everything, do everything, scan through so much information that we could fill up every fraction of a second with a rich tapestry of experiences. In the space of a lifetime we could go through a million, or—why not?—through an infinite number of lives.

Unfortunately, the nervous system has definite limits on how much information it can process at any given time. There are just so many “events” that can appear in consciousness and be recognized and handled appropriately before they begin to crowd each other out. Walking across a room while chewing gum at the same time is not too difficult, even though some statesmen have been alleged to be unable to do it; but, in fact, there is not that much more that can be done concurrently. Thoughts have to follow each other, or they get jumbled. While we are thinking about a problem we cannot truly experience either happiness or sadness. We cannot run, sing, and balance the checkbook simultaneously, because each one of these activities exhausts most of our capacity for attention.

At this point in our scientific knowledge we are on the verge of being able to estimate how much information the central nervous system is capable of processing. It seems we can manage at most seven bits of information—such as differentiated sounds, or visual stimuli, or recognizable nuances of emotion or thought—at any one time, and that the shortest time it takes to discriminate between one set of bits and another is about 1/18 of a second. By using these figures one concludes that it is possible to process at most 126 bits of information per second, or 7,560 per minute, or almost half a million per hour. Over a lifetime of seventy years, and counting sixteen hours of waking time each day, this amounts to about 185 billion bits of information. It is out of this total that everything in our life must come—every thought, memory, feeling, or action. It seems like a huge amount, but in reality it does not go that far.

The limitation of consciousness is demonstrated by the fact that to understand what another person is saying we must process 40 bits of information each second. If we assume the upper limit of our capacity to be 126 bits per second, it follows that to understand what three people are saying simultaneously is theoretically possible, but only by managing to keep out of consciousness every other thought or sensation. We couldn’t, for instance, be aware of the speakers’ expressions, nor could we wonder about why they are saying what they are saying, or notice what they are wearing.

Of course, these figures are only suggestive at this point in our knowledge of the way the mind works. It could be argued justifiably that they either underestimate or overestimate the capacity of the mind to process information. The optimists claim that through the course of evolution the nervous system has become adept at