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Crick on consciousness

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14/09/2016

By | From the Collections

In the States of Mind exhibition at Wellcome Collection you’ll find a small section dedicated to Francis Crick’s work on the science of consciousness. Since the Library also has Crick’s personal papers, we decided to take a closer look at what made a Nobel prize-winning molecular biologist change to a completely new field. As you’ll see from our short series of blog posts, historical as well as scientific influences made a surprising contribution to his thinking.

It’s often forgotten that Francis Crick, who along with James Watson discovered the structure of DNA, spent the last 25 years of his life researching the brain. In fact he spent as long researching the brain as he had on molecular biology and genetics, publishing 23 research papers, many articles and two books on neuroscience and consciousness.

Cover of the Astonishing Hypothesis by James Crick. Proof copy in the Crick Papers. Wellcome Library reference PP/CRI/L/5/6/6/3: Box 330.

Cover of the Astonishing Hypothesis by Francis Crick, 1994. Proof copy in the Crick Papers. Wellcome Library reference: PP/CRI/L/5/6/6/3: Box 330.

Crick was intrigued by how little was known about consciousness. He found it “remarkable that most of the work in both cognitive science and the neurosciences makes no reference to consciousness”. Perhaps Crick speculated, it had been neglected by scientists for most of the 20th century, because we all think we know what consciousness is, just accepting it as some ‘mysterious presence’ inside us.

But Crick was suspicious of anything that proposed a non-physical explanation for the workings of the human body. Neuroscience was not the first place he had encountered such notions, vitalism – the ancient idea that there was some mysterious life force in all living things – was a pervasive influence in biology that was largely dispelled by the findings of molecular biology in the 20th century. For Crick, “a disembodied soul is as unnecessary as the old idea that there was a Life Force.” (Astonishing Hypothesis, p.261)

In a 1979 article about research into the brain, he argued that the time had come for science to take on the ‘taboo’ subject of consciousness. This meant drawing on research from many fields because “the brain is being studied at many levels, from the molecules at its synapses up to complex forms of behaviour, and by diverse approaches – chemical, anatomical, physiological, embryological and psychological”.

L0025506 Descartes, "L'homme et un traitte..." Credit: Wellcome Library, London. Wellcome Images images@wellcome.ac.uk http://wellcomeimages.org Figure from page 81 line drawing L'homme...et un traitte de la formation du foetus du mesme autheur Rene Descartes Published: 1664 Copyrighted work available under Creative Commons Attribution only licence CC BY 4.0 http://creativecommons.org/licenses/by/4.0/

Coordination of muscle and visual mechanisms by means of pineal body in ‘L’homme…et un traitte de la formation du foetus‘ by Rene Descartes, 1664.

As someone new to the field, Crick read and consulted widely, and didn’t limit his investigations to science. He considered the work of philosophers, who had investigated the nature of consciousness and developed various theories since before Descartes’ mind-body separation. But Crick dismissed their introspective approach because:

“Our capacity for deceiving ourselves about the operation of our brain is almost limitless, mainly because what we can report is only a minute fraction of what goes on in our head. This is why philosophy has been barren for more than 2000 years.” (Thinking about the Brain, Scientific American, 1979) Psychology, which sought to explain behaviour in terms of mental processes, was another promising field, but he found that by the 20th century that too had set aside any direct investigation of consciousness:

“The basic difficulty is that psychology attempts to treat the brain as a black box. The experimenter studies the inputs and outputs and tries from the results to deduce the structure and operation inside the box.” (Thinking about the Brain).

Crick was interested in 19th century science on consciousness.

Crick’s studies included the 19th century ‘science’ of phrenology, which like contemporary science assumed that specific areas of the brain were responsible for specific functions and traits.   In ‘Astonishing Hypothesis’, p.86.

Crick concluded that the last time scientists had investigated consciousness in any significant way was in the 19th century and so he readily considered these historical ideas as well. He was particularly interested in the work of William James, the ‘father’ of psychology, on attention. He found James’ book,  ‘The Principles of Psychology’ published in 1890, was “still worth reading in spite of its age” because it “shows that consciousness was an important topic in psychology in those days.”

B0000503 Interneuron in hippocampus Credit: Biosciences Imaging Gp, Soton. Wellcome Images images@wellcome.ac.uk http://wellcomeimages.org An interneuron in the hippocampus, computer-coloured. Published: - Copyrighted work available under Creative Commons by-nc-nd 4.0, see http://wellcomeimages.org/indexplus/page/Prices.html

An interneuron in the hippocampus, computer-coloured. Image credit: Biosciences Imaging Group, Southampton. Wellcome Images reference: B0000503.

Ultimately, Crick was convinced that “the problem of consciousness can, in the long run, be solved only by explanations at the neural level”. Again, he looked to his own experiences in other fields:

“What is conspicuously lacking is a broad framework of ideas within which to interpret all the different approaches. Biochemistry and genetics were in such a state until the revolution in molecular biology” (Thinking about the Brain).

He wrote to a colleague: “The field is crying out for someone to pull it all together or at least put the thinking about it into some sort of order”. And this is just what he set out to do.

From 1979 to 2003 Crick championed the cause of brain science. With his collaborator of 18 years, Christof Koch, he developed a framework for thinking about the conscious mind. Their ultimate aim was to map all the concepts associated with consciousness to properties of synapses, action potentials and neurons. These would be the neural correlates of consciousness (NCC) in the brain and their properties could be analysed scientifically.

Christof Koch, Image source: Wikimedia Commons.

Christof Koch, 2008. Image source: Wikimedia Commons.

By 2003 they had published their framework for consciousness. They set aside the Hard Problems of consciousness, in order to establish the NCC through “careful experimentation”, hoping that when they could “explain the NCC in causal terms, this [would] make the problem of qualia [subjective experiences] clearer”.

Writing in 2004, the year of his death, Crick observed that  “solving the problem of consciousness will need the labors of many scientists, of many kinds, though it is always possible that there will be a few crucial insights and observations” (Foreword for ‘Quest for Consciousness‘). Perhaps he was thinking of the sort of insight that had led Watson and him to the structure of DNA years before.

N0036707 Brain tractography: visualising neuronal tracts Credit: Nuada Medical . Wellcome Images images@wellcome.ac.uk http://wellcomeimages.org This image shows the neuronal tracts in the brain of an adult male, viewed from above. These tracts correspond to bundles of axons, which are the elongated projections that extend from neurons. They form the critical connective 'wiring' that transmits information between neurons within the brain, and to those elsewhere in the body for sensory and motor function. This image has been created using an MRI scanner and an advanced method called diffusion tensor imaging (DTI), which is sensitive to the movement (diffusion) of water molecules in the tissue. Water is able to diffuse more freely along the length of the neuronal tract rather than across it; so, by measuring the main direction of this water movement, this technique can provide directional information on the tracts and allow them to be seen in a living brain. A colour palette is applied to represent the directional information and superimposed on the 3D structural brain image to create the image shown here. 2011 Wellcome Image Award winner. Magnetic resonance imaging Published: - Copyrighted work available under Creative Commons by-nc-nd 4.0, see http://wellcomeimages.org/indexplus/page/Prices.html

Visualisation of neuronal tracts  in the brain, forming the connective ‘wiring’ that transmits information between neurons within the brain. Image credit: Nuada Medical, Wellcome Image Award winner 2011. Wellcome Images reference: N0036707.

Crick may not have uncovered the mysteries of consciousness in his lifetime but he certainly contributed to establishing the science of consciousness. In the early 1980s there were approximately 3000 researchers in neuroscience, by 2009 there were 35,000. I’ll leave the last word to one of them:

“the Nature manifesto [Framework for Consciousness] with Koch… worked because it was done scientifically, acknowledging the limitations and correcting the view based on new evidence (e.g. initially brain synchrony was going to be key and then it became clear that there was more than that). Since then the field has grown a lot and we have embraced many more concepts from neuroscience, psychology and philosophy. His legacy works as reminder of how consciousness should be studied scientifically.” Dr Tristan Bekinschtein, University of Cambridge.

Lalita Kaplish

Lalita Kaplish is Web Editor at the Wellcome Library. You can also find her on LinkedIn and Twitter @LalitaKaplish.

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