The 'First Idea' is long and tedious. I suspect 300 of the 450 pages are unnecessary. Despite this, some of the insights are well worth the effort one must invest to push through the book. The first 100 pages have all the meat. The next 200 are optional. The last 150 are counter productive.
The book proposes a theory by which language emerges from the innate human catalog of emotional states instead of 'logic'. Rather than argue language was 'built' as a 'logical' solution to a dangerous world, they argue that language is a technique for managing or 'avoiding' catastrophic emotional reactions. According to the authors, the caregiver - infant pair who can 'dance' their way through unexpected and frightening events without panic, survive and thrive. They do this by developing a shared set of gestural/auditory icons representing past, present and future emotional states. By shifting rising catastropic emotions like fight and flight out of the 'present state' and into 'icons of the dance', the pair can modulate emotional extremes.
Think about it. Could 'emotion' be the bedrock of logic?
Thinking about this, I was immediately struck by my inability to clearly describe 'emotions'. Are there 2 emotions? 4 emotions? 8 emotions? The shortest list of 'emotions' is binary: fear and anger. A slightly longer list includes 6 emotions: happy, angry, surprise, disgust, fear, sad. Once you get in the mood, the list can get pretty long: Acceptance, Anger, Anticipation, Boredom, Disgust, Envy, Fear, Guilt, Hate, Joy, Jealousy, Love, Remorse, Sorrow, Surprise, Curiosity, Fascination, Confusion, Anxiety, Bewilderment, Frustration, Chagrin, Despair, Hope, Satisfaction, and Confidence. And, there are a variety of emotions which are hard to encapsulate in a single term: 'it is finished', 'I know that', 'I understand'.
If this long list were not confusing enough, there is the common distinction between 'feeling' and 'emotion'. Many use the term 'emotion' to describe 'that which is remembered about a feeling'. Others reverse this, calling 'emotion' the precursor to 'feeling'. Personally, I prefer calling 'emotion' primordial or instinctive, something that emerges from the deepest aspects of our souls. In my view, 'feelings' are the memories of 'emotion'. It is just my vocabulary, and many may use an entirely difference scheme for describing what they experience.
Thus, the assertion that 'language is rooted in emotion' is hardly helpful unless there is a detailed treatment of what the authors mean by 'emotion'. Such a discussion will not be found anywhere in the book's 450 pages.
As I understand it, the authors are arguing that language emerges from the 'dance' infant and caregiver join. The 'dance' is composed of rhythmic 'action' and 'absorb reaction' states which both infant and caregiver cooperatively alternate between. This dance is initiated by the baby when he instinctively seeks to capture the attention of the caregiver by offering a 'stimulus' (crying, smiling, etc.). If the action (a smile) captures the attention of the caregiver, a 'happy' exchange can ensue (the dance). If the baby cannot capture the attention of the caregiver, it will often increase the energy of the stimulus (smile becomes vocalization, becomes crying, etc.) until exhausted or entirely frustrated. The authors suggest this pattern is inate to all human infants (and most mammals). Further, if the infant demonstrates limited interest or capacity for this dance, there is probably going to be an IQ or psychological problem exhibited in later years.
Given this 'dance' which infant and caregiver engage in, language is seen as a refinement which allows greater control of both external 'reality' and internal emotions. Just as ballroom dancers will learn specific 'moves' and then sequences of moves, there will naturally emerge collaborative patterns which represent or symbolize emotional states. Sequences of these states can elicit predictable 'new' emotional states. Memorizing 'moves in the dance' involves defining boundaries and key signals. The process forms the foundation for memorizing words. The pattern of the dance becomes the 'sentence'.
In terms of the caretaker's interactions with babies, the dance is memorized and eventually develops the pair's ability to negotiate undesired or unexpected experiences in life without catastrophic emotion (fear, anger, despair, etc.). The catastropic emotions close out an opportunity for cooperation. The non-catastrophic emotions include joy, curiosity, acceptance, anticipation, etc. If cooperation is essential for the survival of one or both partners, the management of emotional states are all important.
All this is outlined within the first 50 pages, and it represents an interesting proposal for the evolution of human language. Unfortunately, the following 350 pages of supporting arguments are tedious. In particular, the authors repeatedly refer to a table of `functional emotional developmental levels':
1. Shared attention and regulation (from birth)
2. Engagement and relating (2 to 4 months)
3. Two way intentional emotional signaling and communication (4 to 8 months)
4. Long chains of coregulated emotional signaling, social problem solving and formation of presymbolic self
5. Creating representations, symbols or ideas (18 months on)
6. Building bridges between ideas, logical thinking (2.5 years on)
7. etc.
This developmental pattern (the Affect Diathesis Hypothesis) is then the scaffold from which `an explanation of everything' is constructed. We wander through a recap of 2 million years of human evolution, the evolution of societies, and the necessary admonitions for saving humanity from itself. None of these were particularly interesting.