Human intelligence progressively diminishing: Study
London: Humans are losing intellectual and emotional capabilities because we no longer need intelligence to survive, a new study has claimed.
Researchers from Stanford University claim the intricate web of genes which endows us with our brain power is particularly vulnerable to mutations - and these mutations are not being selected against our modern society because we no longer need intelligence to survive.
However, we shouldn`t lose any sleep over our diminishing brain power - as by the time it becomes a real problem - technology will have found a solution making natural selection obsolete, the `Daily mail` reported.
"The development of our intellectual abilities and the optimisation of thousands of intelligence genes probably occurred in relatively non-verbal, dispersed groups of peoples before our ancestors emerged from Africa," said Dr Gerald Crabtree, lead author.
In this environment, intelligence was critical for survival, and there was likely to be immense selective pressure acting on the genes required for intellectual development, leading to a peak in human intelligence.
It was downhill from there on in as, from that point, it`s likely that we began to slowly lose ground, researchers claim.
According to researchers, with the development of agriculture, came urbanisation, which may have weakened the power of selection to weed out mutations leading to intellectual disabilities.
Based on calculations of the frequency with which deleterious mutations appear in the human genome and the assumption that 2,000 to 5,000 genes are required for intellectual ability, Crabtree estimates that within 3,000 years - about 120 generations - we have all sustained two or more mutations harmful to our intellectual or emotional stability.
Recent findings from neuroscience suggest that genes involved in brain function are uniquely susceptible to mutations, the report said.
Crabtree argues that the combination of less selective pressure and the large number of easily affected genes is eroding our intellectual and emotional capabilities.
The study was published in Cell Press journal Trends in Genetics.
More from India
More from World
More from Sports
More from Entertaiment
- Bihar will celebrate two Diwalis in 2015, one will be after poll results: Modi
- DNA: Analysis of Lal Bahadur Shastri's mysterious death
- DNA: Analysis of Prime Minister Modi's rapidfire politics on Gandhi Jayanti
- Is Mahatma Gandhi's name slowly fading away from the minds of the youth?
- Lalu Prasad calls beef eating people uncultured
- World can now see consequences of Pakistan occupation in PoK: India
- Indrani Mukerjea's condition critical due to drug overdose; Maha govt orders inquiry
- ISL 2015: Chennaiyin FC vs Atletico de Kolkata - Preview
- Singh Is Bliing movie review: Watch it for Akshay Kumar!
- Watch: NASA releases best images of Pluto's largest moon, Charon