So many synapses,' Drisana said. 'Ten trillion synapses in the cortex alone.'
Danlo made a fist and asked, 'What do the synapses look like?'
'They're modelled as points of light. Ten trillion points of light.' She didn't explain how neurotransmitters diffuse across the synapses, causing the individual neurons to fire. Danlo knew nothing of chemistry or electricity. Instead, she tried to give him some idea of how the heaume's computer stored and imprinted language. 'The computer remembers the synapse configuration of other brains, brains that hold a particular language. This memory is a simulation of that language. And then in your brain, Danlo, select synapses are excited directly and strengthened. The computer speeds up the synapses' natural evolution.'
Danlo tapped the bridge of his nose; his eyes were dark and intent upon a certain sequence of thought. 'The synapses are not allowed to grow naturally, yes?'
'Certainly not. Otherwise imprinting would be impossible.'
'And the synapse configuration – this is really the learning, the essence of another's mind, yes?'
'Yes, Danlo.'
'And not just the learning – isn't this so? You imply that anything in the mind of another could be imprinted in my mind?'
'Almost anything.'
'What about dreams? Could dreams be imprinted?'
'Certainly.'
'And nightmares?'
Drisana squeezed his hand and reassured him. 'No one would imprint a nightmare into another.'
'But it is possible, yes?'
Drisana nodded her head.
'And the emotions ... the fears or loneliness or rage?'
'Those things, too. Some imprimaturs – certainly they're the dregs of the City – some do such things.'
Danlo let his breath out slowly. 'Then how can I know what is real and what is unreal? Is it possible to imprint false memories? Things or events that never happened? Insanity? Could I remember ice as hot or see red as blue? If someone else looked at the world through shaida eyes, would I be infected with this way of seeing things?'
Drisana wrung her hands together, sighed, and looked helplessly at Old Father.
'Oh ho, the boy is difficult, and his questions cut like a sarsara!' Old Father stood up and painfully limped over to Danlo. Both his eyes were open, and he spoke clearly. 'All ideas are infectious, Danlo. Most things learned early in life, we do not choose to learn. Ah, and much that comes later. So, it's so: the two wisdoms. The first wisdom: as best we can, we must choose what to put into our brains. And the second wisdom: the healthy brain creates its own ecology; the vital thoughts and ideas eventually drive out the stupid, the malignant and the parasitical.
