As stated in the Presentation, the heritability of IQ is estimated to be between 0.7 & 0.8 in adults and 0.45 in childhood.
This presentation includes use of audio and video for communication purpose directed at both the sense of sight and the sense of hearing.
Generally, a Heritability estimates are computed by comparing the IQ correlations of a twins and other relatives.
In conclusion, the heritability of intelligence is exepected to increases from about 20% in infancy to perhaps 80% in later adulthood.
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