So, how did SF do it? Let’s look again at the letter-remembering exercise. We saw that, under normal circumstances, remembering more than six or seven letters is pretty difficult without a great deal of concentration and without constantly repeating the letters to oneself. Now try remembering the following thirteen letters. I suspect you will be able to do so without any difficulty whatsoever – indeed, without even bothering to read through the letters one by one.
ABNORMALITIES
Piece of cake, wasn’t it? Why? For the simple reason that the letters were arranged in a sequence, or pattern, that was instantly familiar. You were able to recall the entire series of letters by, as it were, encoding them in a higher-order construct (i.e., a word). This is what psychologists call ‘chunking’.
Now, suppose I were to write down a list of random words. We know from our previous exercise that you would probably be able to remember six or seven of them. That is the number of items that can be comfortably stored in short-term memory. But, at thirteen letters per word, you would, by implication, be remembering around eighty letters. By a process of ‘chunking’, you have been able to remember as many letters as SF remembered numbers.
Think back to SF’s battle with the digit span task. He kept saying things like, ‘Three-forty-nine-point-two’. Why? Because when he heard the numbers 3 4 9 2, he thought of it as 3 minutes, 49.2 seconds, nearly a world record time for running the mile. In the same way other four-digit sequences became times for running the marathon, or half-marathon.
SF’s ‘words’ were, in effect, mnemonics based on his experience as a club runner. This is what psychologists call a retrieval structure.
Now, let’s take a detour into the world of chess. You’ll be aware that chess grandmasters have astonishing powers of recall and are able to play a mind-boggling number of games at the same time, without even looking at the boards. Alexander Alekhine, a Russian grandmaster, once played twenty-eight games simultaneously while blindfolded in Paris in 1925, winning twenty-two, drawing three, and losing three.
Surely these feats speak of psychological powers that extend beyond the wit of ‘ordinary’ people like you and me. Or do they?
In 1973 William Chase and Herbert Simon, two American psychologists, constructed a devastatingly simple experiment to find out (Chase is the researcher who would later conduct the experiment with SF). They took two groups of people – one consisting of chess masters, the other composed of novices – and showed them chessboards with twenty to twenty-five pieces set up as they would be in normal games. The subjects were shown the boards briefly and then asked to recall the positions of the pieces.
Just as expected, the chess masters were able to recall the position of every piece on the board, while the non-players were only able to place four or five pieces. But the genius of the experiment was about to be revealed. In the next set of tests, the procedure was repeated, except this time the pieces were set up not as in real games, but randomly. The novices, once again, were unable to recall more than five or so pieces. But the astonishing thing is that the experts, who had spent years playing chess, were no better: they were also stumped when trying to place more than five or six pieces. Once again, what looked like special powers of memory were, in fact, nothing of the kind.
What was going on? In a nutshell, when chess masters look at the positions of the pieces on a board, they see the equivalent of a word. Their long experience of playing chess enables them to ‘chunk’ the pattern with a limited number of visual fixations in the same way that our familiarity with language enables us to chunk the letters constituting a familiar word. It is a skill derived from years of familiarity with the relevant ‘language’, not talent. As soon as the language of chess is disrupted by the random positioning of pieces, chess masters find themselves looking at a jumble of letters, just like the rest of us.
The same findings extend to other games, like bridge, and much else besides. Time and again, the amazing abilities of experts turn out to be not innate gifts but skills drawn from years of dedication that disappear as soon as they are transported beyond their specific realm of expertise. Take SF. Even after he had built up the capacity to remember an astonishing 82 numbers, he was unable to recall more than six or seven random consonants.
Now let’s shift up a gear by taking these insights into the realm of sport.
The Mind’s Eye
In December 2004 I played a game of tennis with Michael Stich, the former Wimbledon tennis champion from Germany, at the Harbour Club, a plush sporting facility in west London. The match was part of a promotional day pitting journalists against top tennis players to publicize an upcoming competition at the Royal Albert Hall. Most of the matches were light-hearted affairs, with Stich hamming it up and giving the journalists the runaround, much to the amusement of onlookers. But when I came up against Stich, I wanted to conduct a little experiment.
I asked Stich to serve at maximum pace. He has one of the fastest serves in the history of the sport – his personal best is 134 mph – and I was curious to see whether my reactions, forged over twenty years of international table tennis, would enable me to return it. Stich smiled at the request, graciously assented, and then spent a good ten minutes warming up, loosening his shoulders and torso to gain maximum leverage on the ball. The onlookers – around thirty or so club members – suddenly became very curious, and the atmosphere a little tense.
Stich came back on to court sporting a light sweat, bounced the ball, and glanced across the net, as was his routine. I crouched down and focused hard, coiled like a spring. I was confident I would return the serve, although I was not certain it would be much more than a soft mid-court lob. Stich tossed the ball high into the air, arched his back, and then, in what seemed like a whirl of hyperactivity, launched into his service action. Even as I witnessed the ball connecting with his racket, it whirred past my right ear with a speed that produced what seemed like a clap of wind. I had barely rotated my neck by the time it thudded against the soft green curtains behind me.
I stood up straight, bemused, much to Stich’s merriment and that of the onlookers, many of whom were squealing with laughter. I couldn’t fathom how the ball had travelled so effortlessly fast from his racket, on to the court, and then pinged past my head. I asked him to send down another, then another. He served four straight aces before approaching the net with a shrug of the shoulder and a slap of my back. He told me that he had slowed down the last two serves to give me a fighting chance. I hadn’t even noticed.
Most people would conclude from this rather humbling experience that the ability to connect with, let alone return, a serve delivered at more than 130 mph must belong exclusively to those with innate reaction speeds – what are sometimes called instincts – at the outer limits of human capability. It is an inference that almost jumps up and bites you when the ball has just rocketed so fast past your nose that you’re relieved at having avoided injury.
But I was forbidden from reaching any such conclusion. Why? Because in different circumstances, I have those extraordinary reaction speeds. When I stand behind a table tennis table, I am able to react to, and return, smash-kills in the blink of an eye. The time available to return a serve in tennis is approximately 450 milliseconds; but there are less than 250 milliseconds in which to return a smash-kill in table tennis. So, why could I return the latter and not the former?
In 1984 Desmond Douglas, the greatest-ever UK table tennis player, was placed in front of a screen containing a series of touch-sensitive pads at the University of Brighton. He was told that the pads would light up in a random sequence and that his task was to touch the relevant pad with the index finger of his favoured hand as soon as he could, before waiting for the next pad to light up. Douglas was highly
