The Evolution/Machine La Mettrie’s L'homme machine

In 1748 La Mettrie published, in Holland, L'homme machine.The following gives some idea of the argument in L’Homme Machine:

“Let us conclude boldly that man is a machine. The human body is a watch, a large watch constructed with such skill and ingenuity. To be a machine, to feel, to think, to know how to distinguish good from bad, as well as blue from yellow, in a word, to be born with an intelligence and a sure moral instinct, and to be but an animal, are therefore characters which are no more contradictory, than to be an ape or a parrot and to be able to give oneself pleasure. In general, the form and the structure of the brains of quadrupeds are almost the same as those of the brain of man; the same shape, the same arrangement everywhere, man the one whose brain is largest, and more convoluted.”

“The transition from animals to man is not violent, The springs of the human machine are such that all the vital, animal, natural, and automatic motions are carried on by their action..”

Reconsidering L’homme machine in the light of advances in neuroscience and evolutionary biology What do we share with animals? What don’t we share with animals? How have we acquired the things we do not share with animals ? What part has language played? How did we acquire language ? How did human brain size and intelligence increase so rapidly and remarkably ?

La Mettrie proposed that the human is 100% machine How much of a machine should we think we are now?

There is little in the detail of what La Mettrie said which nowadays would be disputed. Research in molecular biology and in neuroscience every day is showing how wonderfully the “springs” of human and animal action function. As shown by the following examples of the essential machinery we share with animals (even, at the cell level, with yeast ! )

These videos present, in real time, what Francis Crick called the central dogma of modern biology, how DNA makes protein and also suggest how neurons change to respond to incoming information and to the cell environment

DNA TRANSCRIPTIONDNA TRANSCRIPTION: The DNA strand (purple) is held in the cell nucleus by the polymerase complex (blue- grey), collects the complementary codons (yellow) and is read out into messenger RNA (yellow)

TRANSLATIONTRANSLATION: mRNA (yellow) emerges from the cell nucleus and is captured by a ribosome (blue), collects transfer RNA (green) with amino-acids attached (red tips) and exits as a protein (red) haemoglobin

NEUROSCIENCE Brain Remodelling I

NEUROSCIENCE Brain Remodelling I

DendriteDendrite(blue) spines growing in real time (recorded in 2006) Spines grow on the surface of the neuron, on the dendrites

NEUROSCIENCE Brain Remodelling II The strategies used for storing memory are the same from mollusks to mammals. “There are no fundamental … differences between the nerve cells and synapses of humans and those of a snail, a worm or a fly.”

Science shows us how more profoundly we are machines Evolutionary theory suggests we are machines in a broader sense

EVOLUTION

What else is machine besides the clearly biochemical machinery? What else do we share with animals? Feeling as part of the machine - I feel … hungry, thirsty pain, desire. The senses: tasting, smelling, hearing, seeing, touching. Emotions, guilt (Do not walk on the grass !)

What made it possible for man not to be altogether a machine? To be a modifiable machine? How comes it that l’homme machine can now re- jig the machine? Can be a self-transforming machine ?

WHAT DO WE NOT SHARE WITH ANIMALS?

A sensory-motor cortex 5 times larger than for the chimpanzee Speech and spoken language certainly (and writing) - but much else Mind Consciousness? Laughter Amazing bodily skills Music Clothes (perhaps the first nearly universal cosmetic) The (human) predictive (planning) power. The elaboration of mental simulation and imagery.

Mind is the dynamic system manifesting in thought and action Consciousness as an idea is closer to feeling and degrees of feeling. Animals and all life may have varying degrees of consciousness But it is less certain whether any animals have mind as an originating, controlling and predictive system

Understanding of the human mind and human consciousness has advanced surprisingly little since La Mettrie’s time (despite Darwin)

The question remains how human beings advanced from shared mechanical animality to the achievements which have left other animals far behind. How to explain the emergence of the individual and social superstructure which humans have erected on the same physical base as the ape, the dog, the drosophila?

LANGUAGE La Mettrie asked what was man before the invention of words and the knowledge of language. The contribution of language to the ascent of the human being is no novel discovery (Aristotle, Darwin and many others). How has language made us into the humans we are individually and in groups ? What did it do for the ascent of mind? How did it function to increase intelligence and power?

Separate what language does: In the brain – Internally – In the human group – Externally –

Internally (in the brain)

Role in ? creating mind creating the self creating I and You making possible prediction and the planning of action stabilising understanding discriminating past present and future > time labelling memory > history analysing and mirroring the external world reshaping the brain - increasing intelligence

Externally (in the group)

Language operating at a distance - and writing at a further distance, in time as well as in space Family relationships made conscious by naming Communication in the group and the stabilisation of groups Classification of objects Accumulation of knowledge and invention A language as externalised mind ?

Language distances us from the immediate reality - mirrors our world and allows us to operate in the mirrored world. Mind has offered the possibility of freedom from evolutionary drives, which otherwise make humans, like all animals, into evolutionary puppets

WORDS Language is a system of words It is through words that language has changed human beings

How could words do all these things? Because:.Words are not arbitrary.Words are not symbols.Words change the structure of the brain.Words increase the size and complexity of the brain.Words are integrated with and form part of the motor system of the brain.Words form a network in the brain, a network of linked interacting neurons.Words accumulate and integrate.Words allow a distance between immediate experience and the experiencing self.Words create the self in time and space

.Words actively mirror the world.Words transmit experience from one person to another.Words change the other person’s mind and brain.Words can program action for the individual.Words can program the action of others.Words can program action for the group..Words can be an instrument for power of the group.Words can change the environment for individual selection.Words can change the environment for group selection.Words change fitness and so survival of individuals with bigger brains and greater effectiveness in the physical and cultural environment

GESTURES Words have made humans into what they are now But where did the words come from: Words came from gestures.

Where do the gestures come from? Gestures come from perception (visual, auditory and other sensation) of the world, of the human being’s own bodily experience - shapes, sounds, movements etc.

But why humans using gestures ? For gestures the hands and arms must be free. Bipedalism freed the hands and arms and made possible and necessary changes in the motor processes of the brain Walking on two feet may not only have contributed to the emergence of gesture but also made possible refinements in control of the hands, manipulation, seen in advances in toolmaking and in many other manual skills

The universality of gesture? Seeing gesture as at the origin of language (Condillac) Gesture manifests the relation between language and action. It was at the origin of language and is of central importance in the relation between motor articulation and the motor storage of the concepts and percepts from which individual words derive their meaning

Was each gesture as arbitrary as traditional linguistics says that each word is? Clearly not. Gestures of all kinds were generated by imitation of actions, shapes and sounds. These were stored as motor programs before humans acquired speech. “The discovery of mirror neurons may provide a new, though still sketchy, neurobiological basis to account for the emergence of language” (Gallese)

FROM GESTURE TO SPEECH

“Neuroanatomically, the step from genetically determined controlled vocal patterns is associated with the emergence of a direct connection between the motor cortex and the laryngeal motoneurons, a connection lacking in subhuman primates” (Jürgens, Uwe [German Primate Center, Göttingen] A computational model has been constructed which allows prediction of the fMRI images in the brain associated with individual words. (Mitchell et al. Science 30 May 2008)

Cerebral reorganisation provided new direct connections between the motor cortex, the tongue and the larynx. There was a great increase in the innervation of the articulatory apparatus generally. Motor programs from gestural origins were transduced automatically into articulated words structured by the gestural programs. The meanings of words were automatically linked to the actions, sounds and shapes to which the gestures referred.

The process by which words were formed was the inverse of the process by which gestures and sounds can be generated from existing word-forms - a reverse application of motor equivalence. On seeing some one hitting something, the action patterning was by motor equivalence converted into articulatory patterning to produce a speech-sound structure, a word, directly related to the action patterning seen. Similarly on hearing an animal sound, the typical sound of a cat, a hyena, a wasp or a wolf, the sound-patterning is transduced by motor equivalence to form a word whose structure is derived from the sound heard.