Welcome to The Nonlinear Library, where we use Text-to-Speech software to convert the best writing from the Rationalist and EA communities into audio. This is: Attention control is critical for changing/increasing/altering motivation, published by kalla724 on LessWrong. I’ve just been reading Luke’s “Crash Course in the Neuroscience of Human Motivation.” It is a useful text, although there are a few technical errors and a few bits of outdated information (see [1], updated information about one particular quibble in [2] and [3]). There is one significant missing piece, however, which is of critical importance for our subject matter here on LW: the effect of attention on plasticity, including the plasticity of motivation. Since I don’t see any other texts addressing it directly (certainly not from a neuroscientific perspective), let’s cover the main idea here. Summary for impatient readers: focus of attention physically determines which synapses in your brain get stronger, and which areas of your cortex physically grow in size. The implications of this provide direct guidance for alteration of behaviors and motivational patterns. This is used for this purpose extensively: for instance, many benefits of the Cognitive-Behavioral Therapy approach rely on this mechanism. I – Attention and plasticity To illustrate this properly, we need to define two terms. I’m guessing these are very familiar to most readers here, but let’s cover them briefly just in case. First thing to keep in mind is the plasticity of cortical maps. In essence, particular functional areas of our brain can expand or shrink based on how often (and how intensely) they are used. A small amount of this growth is physical, as new axons grow, expanding the white matter; most of it happens by repurposing any less-used circuitry in the vicinity of the active area. For example, our sense of sight is processed by our visual cortex, which turns signals from our eyes into lines, shapes, colors and movement. In blind people, however, this part of the brain becomes invaded by other senses, and begins to process sensations like touch and hearing, such that they become significantly more sensitive than in sighted people. Similarly, in deaf people, auditory cortex (part of the brain that processes sounds) becomes adapted to process visual information and gather language clues by sight. Second concept we’ll need is somatosensory cortex (SSC for short). This is an area of the (vertebrate) brain where most of the incoming touch and positional (proprioceptive) sensations from the body converge. There is a map-like quality to this part of our brain, as every body part links to a particular bit of the SSC surface (which can be illustrated with silly-looking things, such as the sensory homunculus). More touch-sensitive areas of the body have larger corresponding areas within the SSC. With these two in mind, let’s consider one actual experiment [4]. Scientists measured and mapped the area of an owl monkey’s SSC which became activated when one of his fingertips was touched. The monkey was then trained to hold that finger on a tactile stimulator – a moving wheel that stimulates touch receptors. The monkey had to pay attention to the stimulus, and was rewarded for letting go upon detecting certain changes in spinning frequency. After a few weeks of training, the area was measured again. As you probably expected, the area had grown larger. The touch-processing neurons grew out, co-opting surrounding circuitry in order to achieve better and faster processing of the stimulus that produced the reward. Which is, so far, just another way of showing plasticity of cortical maps. But then, there is something else. The SSC area expanded only when the monkey had to pay attention to the sensation of touch in order to receive the reward. If a monkey was trained to keep a hand on the wheel that moved just the same, but he did not have to pay attention to it. the cortical map remained the same size. Thi...