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Continuity of intelligence construct throughout animal kingdom
from the section "Animal Intelligence" (pp 175-182) from Jensen's book
Bias in Mental Testing.
According to Arthur Jensen, intelligence among all animals is essentially the same thing:Dissident Dan said:We come from a common background at some point. The fact that humans weren't just dropped down from the sky by god, separate from other animals, indicates that other animals have mental capacities similar to my own.
Code:
The main indices of intelligence in animals are the speed of learning
and the complexity of what can be learned, the integration of sensory
information to achieve a goal, flexibility of behavior in the face of
obstacles, insightful rather than trial-and-error problem-solving
behavior, transfer of learning from one problem situation to somewhat
different situations, and capacity to acquire abstract or relational
concepts. There is a definite relationship between high and low
ratings of animals' performances along these dimensions (all of which
involve a common fact of differences in complexity) and the animals'
phylogenetic status. Numerous ingenious behavioral tests have been
devised to investigate this relationship, tests that permit
comparisons of behavioral capacities of quite differing animals
despite their often vast differences in sensory and motor capacities.
It is possible to give such diverse species as fish, birds, rats,
cats, and monkeys essentially equivalent forms of the same test
problems. In terms of measured learning and problem-solving
capacities, the single-cell protozoan (e.g., the ameba) rank at the
bottom of the scale, followed in order by the invertebrates, the
lower mammals, the primates, and man. The vertebrates have been
studied most intensively and show fishes at the bottom of the
capacity scale, followed by amphibians, reptiles, and birds. Then
comes the mammals, with rodents at the bottom followed by the
ungulates (cow, horse, pig, and elephant, in ascending order), then
the carnivores (cats and dogs), and finally the primates, in order:
new world monkeys, old world monkeys, the apes (gibbon, orangutan,
gorilla, chimpanzee), and, at the pinnacle, humans. Because of
individual differences within species, there is considerable overlap
between adjacent species and even adjacent phyla in the phylogenetic
hierarchy.
Bias in Mental Testing.