Dr Crabtree told the online journal Natural Society that humans were at their peak when exposed to nature's "fight or flight mechanism".
Under those conditions humans were forced to rely on memory, clear thinking and emotional stability that allowed us to trust our instincts and adapt to situations quickly.
Modern life places other demands on our bodies and our minds, but technology has replaced our need to rely on our natural abilities and instincts.
Our over-processed diet is not doing us any favours, either. British researchers recently discovered that a steady intake of foods high in fructose can quickly reduce IQ. Pesticides and fluoride found in water supply are also said to have a negative impact on brain development.
But all is not lost. Dr Crabtree argues that our superior education and progress means we'll have figured out how to overcome these weaknesses in another 300 years or so.
heraldsun.com.au 19 Feb 2013
Technically, it's all part of the plan, to dumb down the masses.
Education is held by a handful of people and not released into the general populous.
It is of no consequence to governments that their citizens are not bright, as they are easier to control.
Keeping them occupied with menial trivial events, and falsified TV reality shows is the 'normality' now, as it's all part of the 'programming'.