Can You Improve Intelligence and IQ?
The consistency of an individual’s IQ scores over time has been interpreted as showing that IQ is mostly genetically determined. This view has been popularized by the influential book on IQ and group differences in IQ - The Bell Curve. The Bell Curve, published in 1996 by Richard J. Herrnstein and Charles Murray, made waves by arguing that intelligence is a singular, definable, measurable quantity that is highly heritable.
But growing evidence shows that intelligence can change over time as a function of a person’s learning and life experiences (for reviews, see Flynn, 2000; Nisbett, 2009). You can improve intelligence and IQ. This evidence is supported by research on frontal cortex neuroplasticity showing that the brain is highly plastic and changeable in its information processing circuitry.
The science tells us there are in fact a number of ways in which you can increase your IQ.
IQ Increasing Technologies: A Review
This article reviews three of the most effective IQ-increasing interventions that have a firm scientific basis – a basis in experimental laboratories and the exacting standards of peer reviewed scientific journals. The methods described below are part of the accumulated understanding of the scientific community about what can increase IQ – not just temporarily but long-term. Cognitive-enhancing nutrition, exercise and meditation is not covered in this review, which focuses on the use of intervention technologies.
1. Brain Training Software: N-back
Far-reaching advances in cognitive psychology and cognitive neuroscience over the past decade have identified a close link between frontal lobe ‘working memory’ circuitry, and fronto-parietal problem solving, self-control and fluid reasoning circuitry. Our working memory is used for holding information in mind (images, concepts, language, numbers) for brief periods while engaging in active, goal-focused thinking or comprehension, while screening out distracting information. Working memory has a limited capacity, and the bigger that capacity the more the cognitive ‘RAM’ power a person has for processing information – to make connections, generate alternatives, and grasp relationships. This brainpower lies at the core of being smart. If super brain Eddie Morra in Limitless changed one thing in his brain, it was his working memory circuitry!
Software has now been developed for selectively targeting working memory circuitry, resulting in long term neuroplasticity changes increasing short term memory capacity, problem solving ability, self-control and overall IQ. This software is based on a training exercise called the n-back. A scientifically credible version of this software is HighIQPro.
A review published this year on the effectiveness of n-back working memory training by an old grad school friend, Dr Jason Chein, concludes:
“there is a rapidly growing number of studies demonstrating that training-related increases in working memory capacity can yield improvements in a range of important cognitive skills (Chein & Morrison, 2010) as well as improved cognitive function in clinical populations with known WM deficiencies”
“core working memory training studies seem to produce far-reaching transfer effects, likely because they target domain-general mechanisms of working memory. The results of individual studies encourage optimism regarding the value of working memory training as a tool for general cognitive enhancement.”
In choosing an n-back working memory training application, ensure that you have a version and training program that has been demonstrated to increase IQ in a published scientific study – such as the landmark paper by Dr. Susan Jaeggi and colleagues (link) that first drew public attention to the benefits of n-back training. There are a number of n-back training programs on the market that do not replicate what is known to work. Avoid them.
2. Nootropics (‘Smart Drugs’)
The issue of using medication for cognitive enhancement is highly controversial, but the ethics of smart drugs is not discussed in this article. I’m simply presenting the facts.
Nootropics – also known as smart drugs, memory enhancers, cognitive enhancers and intelligence enhancers – are drugs, supplements, nutraceuticals (a product isolated or purified from foods) that are designed to improve cognitive functions such as memory, attention and intelligence. The use of nootropics for cognitive performance is widespread.
In January, the prestigious science journal Nature launched an informal survey into readers’ use of cognition-enhancing drugs, and found large-scale use (link). One in five respondents said they had used drugs for non-medical reasons to stimulate their focus, concentration or memory.
In 2008, Nature ran a commentary on this topic: Towards responsible use of cognitive enhancing drugs by the healthy. This article is well worth the time it takes to read. The authors outline the evidence in favor of the effectiveness of “smart drugs” and I will quote at length from the section “Paths to Enhancement” which reviews the nootropics known to boost brain power:
Ritalin and Adderall
Many of the medications used to treat psychiatric and neurological conditions also improve the performance of the healthy. The drugs most commonly used for cognitive enhancement at present are stimulants, namely Ritalin (methyphenidate) and Adderall (mixed amphetamine salts), and are prescribed mainly for the treatment of attention deficit hyperactivity disorder (ADHD). Because of their effects on the catecholamine system, these drugs increase executive functions in patients and most healthy normal people, improving their abilities to focus their attention, manipulate information in working memory and flexibly control their responses…
A newer drug, Modafinil (Provigil), has also shown enhancement potential. Modafinil is approved for the treatment of fatigue caused by narcolepsy, sleep apnoea and shift-work sleep disorder. It is currently prescribed off label for a wide range of neuropsychiatric and other medical conditions involving fatigue as well as for healthy people who need to stay alert and awake when sleep deprived, such as physicians on night call. In addition, laboratory studies have shown that modafinil enhances aspects of executive function in rested healthy adults, particularly inhibitory control. Unlike Adderall and Ritalin, however, Modafinil prescriptions are not common, and the drug is consequently rare on the college black market. But anecdotal evidence and a readers’ survey both suggest that adults sometimes obtain modafinil from their physicians or online for enhancement purposes.
A modest degree of memory enhancement is possible with the ADHD medications just mentioned as well as with medications developed for the treatment of Alzheimer’s disease such as Aricept (donepezil), which raise levels of acetylcholine in the brain. Several other compounds with different pharmacological actions are in early clinical trials, having shown positive effects on memory in healthy research subjects.
The authors focus at length on the potential risks and ethical concerns of using nootropic cognitive enhancers, but conclude:
Like all new technologies, cognitive enhancement can be used well or poorly. We should welcome new methods of improving our brain function. In a world in which human workspans and lifespans are increasing, cognitive enhancement tools — including the pharmacological — will be increasingly useful for improved quality of life and extended work productivity, as well as to stave off normal and pathological age related cognitive declines23. Safe and effective cognitive enhancers will benefit both the individual and society.
3. Cortical Stimulation
A number of studies in the last few years have shown very promising results from applying electrical current to the brain using a technology known as transcranial direct current stimulation (tDCS). tDCS is a noninvasive technique in which a weak current is applied to the brain constantly over time to excite or inhibit the activity of neurons.
In late 2010, a group of researchers from University College London and Oxford University published a study showing that tDCS applied to the parietal lobes enhanced a person’s mathematical ability selectively, without influencing other cognitive functions. The improvement was found to have persisted six months after the training, showing the IQ gain was long-lasting.
Earlier this year a study was published in Clinical Neurophysiology showing that tDCS of a the dorsolateral prefrontal cortex (dlPFC) improves working memory functioning. The dlPFC is a region in the frontal lobes toward the top and side: hence dorso (top) and lateral (side). The researchers report that there was significant improvement in speed of performance following tDCS on an n-back working memory task.
In another study published earlier this year, a team at Centre for the Mind at the University of Sydney demonstrated that tDCS can dramatically improve insight problem solving. Three times as many cortically stimulated individuals succeeded in solving puzzles needing creative insight. People find it difficult to think outside of the box because their problem solving ‘mind set’ becomes crystallized by past experience. By inhibiting the activity of the left temporal lobe, and stimulating activity in the right temporal lobe, this team changed the balance between the two hemispheres of the brain, leading to better release from mental sets and better creative insight. One of the team, Professor Snyder, believes brain boosting headgear could be widely used.
“The thinking cap of the future is not one that helps us to remember facts as the internet has solved that problem, but one that facilitates learning and unlearning mindsets. It’s all about being original.”
Some of the most recent work on tDCS was presented in September this year by Professor Prof Heidi Johansen-Berg and her colleagues at Oxford University. They found that just ten minutes of motor cortex brain stimulation increases the speed of learning motor skills. In their study a musical keyboard sequence was the learning task.
“While the stimulation didn’t improve the participant’s best performance, the speed at which they reached their best was significantly increased.”
The researchers envisage the technique could be used to help in the training of athletes and suggest that the same method could be applied to other parts of the brain (such as the frontal or parietal cortex) to improve educational learning simply by positioning the electrodes in different locations so the current is focused on the correct area.
The potential for self-experimentation is exciting. As this BBC report on cortical stimulation states:
“The relative simplicity, low price (around £2,000 per unit), and portability of the technology may mean that, following further research, a device could be designed to be automated for use at home.”
One of my research areas is IQ and methods for increasing IQ. In this article I have reviewed three technologies that have been shown to have a substantial IQ increasing effect by the exacting standards of peer reviewed scientific research. The most effective technologies directly target working memory – the general purpose RAM power of our brain. But technologies can be effectively applied in a targeted way to enhance more specialized aspects of cognitive function such as motor learning, numerical ability or insight problem solving.
Intelligence augmentation is a cultural enterprise that is gaining momentum, but the technologies reviewed above take us into largely unexplored territory. The risks have not been fully quantified. It is our privilege to be in an era of both imaginative brain science, and biohackers’ responsible self-experimentation, to forge ahead in mapping out this territory in the spirit of pioneers.
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Flynn, J.R. (2000) IQ trends over time: intelligence, race, and meritocracy. In K. Arrow, S. Bowles, & S. Durlauf (eds.), Meritocracy and economic inequality, Princeton, NJ, Princeton University Press 35-60
Mayer, R. E., & Wittrock, R. C. (2006). Problem solving. In P. A. Alexander & P. H. Winne (Eds.), Handbook of educational psychology(2nd ed., pp. 287–304). Mahwah, NJ: Erlbaum. (For a review, click here)
McNab, F., Varrone, A., Farde, L., Jucaite, A., Bystritsky, P., Forssberg, H., & Klingberg, T. (2009). Changes in Cortical Dopamine D1 Receptor Binding Associated with Cognitive Training, Science, 6, 323, 800 – 802.
Morrison, A. & Chein, J. (2011). Does working memory training work? The promise and challenges of enhancing cognition by training working memory. Psychonomic Bulletin & Review, Volume 18, Number 1, February 2011 , pp. 46-60(15)