If the standard 'natural selection' model of creativity is regarded as deficient, as previously argued - I mean the 'Simonton' model in which creativity is explained as a product of the high-Psychoticism-trait (high-P) personality producing wide-ranging and abundant random variations on old ideas, and high intelligence sieving and sorting-through these abundant randomly-varied ideas on the basis of coherence and memorized knowledge - then what do I propose to put in its place?
The key relevant difference between my view and the natural selection view - and the difference which leads to the following alternative model for creativity - concerns the nature of the high-Psychoticism trait.
Eysenck sees Psychoticism in terms of a tendency towards loose or broad associations - in other words a partially-pathological state. Psychoticism is seen as a partial breakdown in the normally tightly controlled and narrow associations of ideas to a situation being more like we have all experienced in dreams, and some people have experienced in delirious states of illness or alcohol withdrawal, or psychotic illnesses such as mania or schizophrenia, or under the influence of psychosis-inducing drugs (such as mescaline or LSD).
By contrast, I regard high-Psychoticism-trait as being an innate, substantially heritable, hard-wired set-up of the nervous system in which some individuals experience a higher dominance by 'inner' states than do most normal people. High-P individuals are inner-attentive, inner-aware, inner-engaged and inner-motivated.
So how does high-P work in producing 'creative solutions'?
The short answer is that the creative insight is preceded by a period of focused 'quest' (which may last many years) during which the mind is filled with more-or-less relevant ingredients. The inner-directed processes then observe, work-on, try to understand these various facts and concepts - try to select among them, achieve a clear view of their proper or best organization or arrangement,
This means that such high P individuals are attentive to their inner states (i.e. their thoughts and emotions, their 'stream of consciousness'), they are more spontaneously aware of their thoughts and feelings, they find these inner experiences more engaging, spontaneously more interesting than external matters such as social and sexual interactions (which fascinate most people for most of the time) - and these inner states provide the dominating motivations for such people, such that they are therefore substantially autonomous - that is to say indifferent to, independent-from peer pressure and socialization.
The process by which the mind works on these ingredients to give a breakthrough is a 'black box' - so far as science is concerned. (Although it can be said that the inner, unconscious mind works by different rules than those of conscious logic.) But it is the high-P person who has the focused abstract interest to bring together the ingredients, to watch the processes of understanding and organization, and to get a clear view of the answer as it emerges; and then powerfully to feel the rightness of the right answer as energies and positive emotions are triggered and experienced.
Although this inner-dominance can be caused by diseases and toxicity or brain damage; which can cause any normal person to be overwhelmed by powerful and pathological inner stimuli, or cut-off-from outer perceptions - the idea of Psychoticism is that high-P is a relatively rare but hereditary personality trait - commoner in men than women, inborn, emerging in childhood and persisting through maturity and adulthood.
The reason that high-P is hereditary, is that it is an evolved adaptation with a useful functional role to play - i.e. creativity - and the reason it is rare is that not many (i.e. not a high proportion) of creative people are required by a society; and high-P tend to be associated with lower reproductive success overall (as would be expected when individual invest more time and other resources in the inner life, and therefore relatively less resource into social and sexual life).
So high-P creative people are sometimes very useful to a particular human society (assuming that society 'takes advantage' of their special abilities) but there cannot be too many and indeed not many are needed.
The reason that high-P people are needed, but not often, is that most socially relevant problems (of population survival and expansion) are dealt-with by habitual and traditional means - the individual is socialized into the usual way of dealing with problems through childhood, and these usually work.
But most human societies have recognized (whether explicitly, or more often implicitly, tacitly, that some problems do yield to tradition or habit, and other problem do not always yield to tradition or habit - and what then?
In a nutshell, then is the time to bring in the creative specialist - the Shaman, the mystic, the intuitive priest, the scientific or inventive genius, the Holy Fool: someone who has resisted socialization and instead thinks by different rules, because he is more engaged with the inner world
So the assumption is that high-P has evolved at a low frequency by some (unknown) group-selection mechanism that leads to a reliable but rare supply of high-P individuals to do this vital but infrequent job. And part of this group-selection must also be a recognition from the majority of low-P individuals that these high-P 'oddball' or 'eccentric' individuals must be tolerated, supported, and asked for advice and guidance in certain relatively unusual circumstances when their special abilities are the best (or only) hope for group survival.
Since the supposed mechanism is group selection, and different human group shave experienced widely different selection pressures; then it is likely that high-P is not found with identical frequency everywhere. This presumably explains why creative genius is very unevenly distributed by time and geographical space - and why its frequency varies over time within the same culture - not least because group selection is always open to being subverted by individual-level selection.
This group selected nature of high-P potentially explains why creative genius is all-but absent from many continents and nations, and also why it may appear in abundance (e.g. in ancient Greece) then disappear. However since genius also requires high general intelligence (high-g) then too low an average level of g, or a decline in g, may also be a cause of declining rates of genius.
But I think it fair to say that high-P is a more crucial aspect of genius than high-g, because any high-P individual who is sufficiently higher in intelligence than the majority of his group can perfom his creative social role; while a low-P person will not be creative, no matter how high his intelligence.
So I imagine that the 'shamans' of a recent hunter gatherer tribe will typically have had an intelligence level that is high for their tribal group, but of a lower than average level for a Western nation (as measured by IQ tests). However, such (by Western standards) 'low-IQ' individuals could nonetheless perform their highly valued and effective social function - so long as they had the high-P, creative personality trait.