Are there additional intelligences?
Since Howard Gardner's original listing of the intelligences in Frames of Mind (1983) there has been a great deal of discussion as to other possible candidates for inclusion (or candidates for exclusion). Subsequent research and reflection by Howard Gardner and his colleagues has looked to three particular possibilities: a naturalist intelligence, a spiritual intelligence and an existential intelligence. He has concluded that the first of these 'merits addition to the list of the original seven intelligences' (Gardner 1999: 52).Naturalist intelligence enables human beings to recognize, categorize and draw upon certain features of the environment. It 'combines a description of the core ability with a characterization of the role that many cultures value' (ibid.: 48).
The case for inclusion of naturalist intelligence appears pretty straightforward, the position with regard to
spiritual intelligence is far more complex. According to Howard Gardner (1999: 59) there are problems, for example, around the 'content' of spiritual intelligence, its privileged but unsubstantiated claims with regard to truth value, 'and the need for it to be partially identified through its effect on other people'. As a result:
It seems more responsible to carve out that area of spirituality closest 'in spirit' to the other intelligences and then, in the sympathetic manner applied to naturalist intelligence, ascertain how this candidate intelligence fares. In doing so, I think it best to put aside the term spiritual, with its manifest and problematic connotations, and to speak instead of an intelligence that explores the nature of existence in its multifarious guises. Thus, an explicit concern with spiritual or religious matters would be one variety - often the most important variety - of an existential intelligence.
Existential intelligence, a concern with 'ultimate issues', is, thus, the next possibility that Howard Gardner considers - and he argues that it 'scores reasonably well on the criteria' (ibid.: 64). However, empirical evidence is sparse - and although a ninth intelligence might be attractive, Howard Gardner is not disposed to add it to the list. 'I find the phenomenon perplexing enough and the distance from the other intelligences vast enough to dictate prudence - at least for now' (ibid.: 66).
The final, and obvious, candidate for inclusion in Howard Gardner's list is moral intelligence. In his exploration, he begins by asking whether it is possible to delineate the 'moral domain'. He suggests that it is difficult to come to any consensual definition, but argues that it is possible to come to an understanding that takes exploration forward. Central to a moral domain, Howard Gardner suggests, 'is a concern with those rules, behaviours and attitudes that govern the sanctity of life - in particular, the sanctity of human life and, in many cases, the sanctity of any other living creatures and the world they inhabit' (ibid.: 70). If we accept the existence of a moral realm is it then possible to speak of moral intelligence? If it 'connotes the adoption of any specific moral code' then Howard Gardner does not find the term moral intelligence acceptable (ibid.: 75). Furthermore, he argues, researchers and writers have not as yet 'captured the essence of the moral domain as an instance of human intelligence' (ibid.: 76).
As I construe it, the central component in the moral realm or domain is a sense of personal agency and personal stake, a realization that one has an irreducible role with respect to other people and that one's behaviour towards others must reflect the results of contextualized analysis and the exercise of one's will.... The fulfilment of key roles certainly requires a range of human intelligences - including personal, linguistic, logical and perhaps existential - but it is fundamentally a statement about the kind of person that has developed to be. It is not, in itself, an intelligence. 'Morality' is then properly a statement about personality, individuality, will, character - and, in the happiest cases, about the highest realization of human nature. (ibid.: 77)So it is, that Howard Gardner has added an eighth intelligence - naturalist intelligence - to his list. He has also opened the door to another possibility - especially that of existential intelligence - but the court is out on that one.