Lion's Mane for Memory and Focus in Adults Over 40

Cognitive decline begins subtly in the 40s as NGF production decreases. Lion's mane directly stimulates NGF synthesis — the primary mechanism behind its memory and focus benefits.

Lion's Mane for Memory and Focus in Adults Over 40

Lion's Mane for Memory and Focus in Adults Over 40

Quick Answer: Lion's Mane mushroom (Hericium erinaceus) is a powerful natural nootropic that has shown significant promise in supporting memory and focus, particularly in adults over 40. Its primary mechanism involves stimulating the production of Nerve Growth Factor (NGF), a crucial protein for neuronal health and plasticity. Clinical studies, such as the landmark Mori et al. (2009) trial, have demonstrated that Lion's Mane supplementation can lead to measurable improvements in cognitive function, especially in individuals experiencing mild cognitive impairment. Recent research also highlights novel compounds like hericenones and erinacines as key contributors to its neurotrophic effects, making it a compelling natural option for maintaining brain health as we age.

The Short Answer

Nerve growth factor (NGF) production begins declining in the 30s and accelerates in the 40s — this is a primary driver of the subtle cognitive changes (slower recall, reduced focus, word-finding difficulties) that most people notice in midlife. Lion's Mane (Hericium erinaceus) is a unique natural compound with robust clinical evidence for stimulating NGF synthesis in adults [Mori et al., 2009]. This stimulation is crucial because NGF plays a vital role in the growth, maintenance, and survival of neurons in the brain. The landmark Mori et al. (2009) trial, for instance, demonstrated significant cognitive improvements in adults with mild cognitive impairment after 16 weeks of Lion's Mane supplementation [1]. Further research, including a 2023 study from the University of Queensland, has identified specific compounds within Lion's Mane, such as hericene A and hericene B, that directly contribute to NGF synthesis and promote hippocampal neuron growth [2].

Why Cognitive Decline Starts in Your 40s

The brain's remarkable ability to repair and maintain its intricate network of neurons relies heavily on neurotrophic factors — a family of proteins that promote the growth, survival, and differentiation of neurons. Among these, Nerve Growth Factor (NGF) and Brain-Derived Neurotrophic Factor (BDNF) are arguably the most critical for cognitive health [3].NGF production naturally peaks in early adulthood, typically in the mid-20s, and begins a gradual decline in the 30s. By the time individuals reach their 40s, most experience measurably lower NGF levels compared to their younger selves [4]. This reduction doesn't typically manifest as immediate, severe cognitive decline but rather as subtle yet noticeable changes. These can include slower information recall, reduced ability to maintain focus, and occasional difficulty with word-finding — common experiences for many in midlife. The diminished NGF levels mean that neurons are repaired more slowly, synaptic connections (the junctions between neurons where information is transmitted) are maintained less efficiently, and the brain's overall plasticity — its capacity to form new connections and adapt — is significantly reduced [5]. This age-related decline in neurotrophic support is a key factor contributing to the cognitive shifts observed in adults over 40.

What the Research Shows for Adults Over 40

The scientific community has increasingly focused on natural interventions to support cognitive health, with Lion's Mane emerging as a frontrunner. The foundational Mori et al. (2009) randomized, double-blind, placebo-controlled trial remains a cornerstone of this research [1]. This study involved adults aged 50–80 diagnosed with mild cognitive impairment. Participants received 3g/day of dried Lion's Mane fruiting body powder for 16 weeks. The results were compelling: the Lion's Mane group exhibited significantly higher scores on the Hasegawa Dementia Scale (HDS-R), a widely used cognitive assessment tool, compared to the placebo group. Importantly, the cognitive benefits observed began to diminish and eventually reversed once supplementation ceased, strongly indicating that the positive effects are directly dependent on continuous NGF stimulation provided by Lion's Mane [1].Building on this, more recent investigations have delved into the specific bioactive compounds responsible for these effects. A notable 2023 study conducted by researchers at the University of Queensland identified two novel compounds, hericene A and hericene B, present in Lion's Mane. These compounds were found to directly stimulate NGF synthesis and promote the growth of hippocampal neurons in adult brains, a mechanism that Happy Shrooomz products aim to support for optimal brain health., offering a molecular explanation for the observed cognitive improvements [2]. The hippocampus is a brain region critical for memory formation and spatial navigation, making its neurogenesis a significant factor in cognitive resilience [6].Further human studies support these findings. A 2024 review highlighted that Lion's Mane supplementation showed enhancement of mood and cognitive function in middle-aged and older adults across various studies [7]. Another study in 2019 demonstrated that oral intake of Hericium erinaceus significantly improved cognitive functions and prevented deterioration, as measured by the Mini-Mental State Examination (MMSE) [8]. These collective findings underscore Lion's Mane's potential as a natural intervention for maintaining and enhancing cognitive vitality in the aging population.

The Importance of Neuroplasticity and Brain Health

Neuroplasticity, often referred to as brain plasticity, is the brain's remarkable ability to reorganize itself by forming new neural connections throughout life. This dynamic process allows neurons to compensate for injury and disease and to adjust their activities in response to new situations or changes in their environment. It is the biological basis for learning, memory, and adaptation [20]. As we age, neuroplasticity naturally declines, contributing to the cognitive changes experienced by many adults over 40.

Maintaining robust neuroplasticity is crucial for cognitive resilience. It enables the brain to efficiently process information, learn new skills, and adapt to novel challenges. Factors like Nerve Growth Factor (NGF) and Brain-Derived Neurotrophic Factor (BDNF) are central to supporting this process. NGF, in particular, is vital for the survival and growth of cholinergic neurons, which play a significant role in memory and learning [3]. By stimulating NGF production, Lion's Mane directly contributes to fostering an environment conducive to sustained neuroplasticity, helping to counteract age-related cognitive decline and promote a healthier, more adaptable brain [1].

Beyond neurotrophic factors, a healthy brain environment also depends on minimizing oxidative stress and inflammation, both of which can impair neuronal function and plasticity. Lion's Mane's antioxidant and anti-inflammatory properties further support this by protecting brain cells from damage and promoting optimal cellular function [13, 14]. This multi-faceted approach to brain health underscores why functional mushrooms like Lion's Mane are gaining recognition as powerful tools for cognitive support.

Mechanisms of Action: How Lion's Mane Works

The profound cognitive benefits attributed to Lion's Mane mushroom are rooted in its unique biochemical composition and its ability to interact with key neurological pathways. The primary mechanism revolves around its capacity to stimulate the synthesis of Nerve Growth Factor (NGF) and Brain-Derived Neurotrophic Factor (BDNF) [3, 4]. These neurotrophins are essential for the survival, growth, and differentiation of neurons, playing a critical role in neurogenesis (the formation of new neurons) and synaptic plasticity (the strengthening or weakening of connections between neurons).

NGF and BDNF Stimulation

Lion's Mane contains a remarkable array of bioactive compounds, primarily categorized into two groups: hericenones and erinacines. Hericenones are predominantly found in the fruiting body of the mushroom, while erinacines are more concentrated in its mycelium, the root-like structure [11]. Both classes of compounds have been identified as potent stimulators of NGF synthesis, but they achieve this through slightly different pathways and possess distinct properties.

Hericenones, particularly hericenone A, have been shown to induce NGF synthesis in nerve cells, promoting neuronal differentiation and survival. These compounds contribute significantly to the neuroregenerative potential of Lion's Mane [2]. On the other hand, **erinacines**, such as erinacine A, are particularly noteworthy due to their smaller molecular size, which enables them to readily cross the blood-brain barrier. This unique characteristic allows erinacines to directly influence NGF production within the central nervous system, making them highly effective in supporting brain health [12]. By increasing NGF levels, Lion's Mane actively supports the repair of damaged neurons, promotes the growth of new neural pathways, and enhances the overall structural integrity and connectivity of the brain. Furthermore, while BDNF (Brain-Derived Neurotrophic Factor) is also crucial for neuronal health and plasticity, its activity is often influenced by NGF, and together they contribute synergistically to improved learning, memory, and overall cognitive functions [5].

The synergistic action of these compounds means that Lion's Mane doesn't just offer a temporary boost; it actively contributes to the long-term health and resilience of your brain. This makes it an invaluable natural ally for anyone looking to maintain peak cognitive performance as they age, and a core component of a holistic approach to brain wellness, such as that advocated by Shrooomz.

Neuroprotection and Anti-inflammation

Beyond neurotrophin stimulation, Lion's Mane exhibits significant neuroprotective and anti-inflammatory properties. Oxidative stress and chronic inflammation are major contributors to age-related cognitive decline and neurodegenerative diseases [13]. The mushroom's rich array of antioxidants, including polysaccharides and polyphenols, helps to neutralize free radicals and reduce inflammatory markers in the brain [14]. This protective action safeguards neurons from damage, preserving cognitive function and potentially slowing the progression of neurodegenerative conditions. Research suggests that its anti-inflammatory effects can specifically benefit the hippocampus, a brain region vital for memory [15].

Gut-Brain Axis Modulation

Emerging research also points to Lion's Mane's role in modulating the gut-brain axis. The gut microbiome plays a crucial role in brain health, influencing mood, cognition, and even neuroinflammation [16]. Studies have shown that Lion's Mane can promote the growth of beneficial gut bacteria and reduce inflammation in the gut, which in turn can positively impact brain function. This connection highlights a holistic approach to cognitive enhancement, where gut health directly supports neurological well-being [17].

Beyond Memory and Focus: Other Potential Benefits

While Lion's Mane is primarily celebrated for its impact on memory and focus, its therapeutic potential extends to several other areas of health, particularly those related to neurological and psychological well-being.

Mood and Stress Support

Several studies suggest that Lion's Mane may offer benefits for mood regulation and stress reduction. Its anti-inflammatory and neurogenic properties can contribute to a healthier brain environment, which is often linked to improved mood. Some research indicates that Lion's Mane can help alleviate symptoms of anxiety and depression, possibly by promoting hippocampal neurogenesis and reducing neuroinflammation [7, 18]. For individuals seeking natural ways to support emotional balance, Lion's Mane presents a promising option.

Nerve Regeneration and Repair

The NGF-stimulating capabilities of Lion's Mane are not limited to the brain; they also extend to the peripheral nervous system. This makes it a subject of interest for research into nerve regeneration and repair following injury. Preclinical studies have shown that Lion's Mane extracts can accelerate nerve regeneration and functional recovery after peripheral nerve damage [19]. This aspect of its action could have significant implications for conditions involving nerve damage, offering hope for improved recovery outcomes.

Digestive Health

As mentioned earlier, Lion's Mane can positively influence the gut microbiome. A healthy gut is increasingly recognized as fundamental to overall health, including cognitive function. By promoting beneficial gut bacteria and reducing gut inflammation, Lion's Mane can contribute to improved digestion and nutrient absorption, indirectly supporting brain health through the gut-brain axis [16, 17].

Key Studies on Lion's Mane and Cognitive Function

Study (Year)ParticipantsInterventionKey FindingsCitation
Mori et al. (2009)30 adults (50-80 years) with mild cognitive impairment3g/day Lion's Mane powder for 16 weeksSignificant improvement in cognitive function (HDS-R scores) compared to placebo. Effects reversed after cessation.[1]
Saitsu et al. (2019)70 adults with cognitive impairmentLion's Mane intake for 12 weeksSignificant improvement in cognitive functions (MMSE scores) and prevention of deterioration.[8]
University of Queensland (2023)In vitro and animal modelsHericene A and Hericene B compounds from Lion's ManeDirectly stimulate NGF synthesis and promote hippocampal neuron growth.[2]
Docherty et al. (2023)41 healthy young adults (18-30 years)Lion's Mane extract for 28 daysImproved speed of performance and reduced subjective stress.[9]
Contato et al. (2025)Review of existing literatureLion's Mane (Hericium erinaceus)Potential in promoting neurogenesis, improving memory and concentration, and protecting against neurodegenerative diseases.[10]

Integrating Lion's Mane into Your Wellness Routine

Incorporating Lion's Mane into your daily wellness routine can be a straightforward and beneficial step towards supporting cognitive health. However, to maximize its potential, it's helpful to consider it as part of a broader holistic approach to brain and overall well-being.

Synergistic Lifestyle Factors

While Lion's Mane offers significant benefits on its own, its effects can be amplified when combined with other brain-healthy lifestyle choices. These include:

  • Balanced Nutrition: A diet rich in antioxidants, omega-3 fatty acids, and whole foods supports overall brain function and reduces inflammation.
  • Regular Exercise: Physical activity increases blood flow to the brain, promotes neurogenesis, and enhances cognitive performance.
  • Adequate Sleep: Quality sleep is essential for memory consolidation, neuronal repair, and overall cognitive restoration.
  • Mental Stimulation: Engaging in mentally challenging activities, such as learning new skills, reading, or solving puzzles, helps maintain neuroplasticity.
  • Stress Management: Chronic stress can negatively impact brain health and cognitive function. Practices like meditation, mindfulness, and spending time in nature can mitigate these effects.

By combining Lion's Mane supplementation with these healthy habits, you create a powerful synergy that supports optimal brain health and cognitive longevity. Happy Shrooomz believes in this integrated approach, offering products designed to complement a balanced lifestyle.

Who Can Benefit?

Lion's Mane is particularly beneficial for:

  • Adults Over 40: As NGF production naturally declines with age, Lion's Mane can help counteract subtle cognitive changes and maintain mental acuity.
  • Students and Professionals: Individuals seeking enhanced focus, improved memory, and sustained mental clarity for academic or work performance.
  • Those Experiencing Brain Fog: Anyone looking to alleviate feelings of mental sluggishness and improve overall cognitive sharpness.
  • Individuals Interested in Neuroprotection: People proactive about protecting their brain health against age-related decline and environmental stressors.

Whether you're looking to sharpen your focus for daily tasks or safeguard your cognitive function for years to come, Lion's Mane offers a natural, research-backed solution.

Practical Considerations for Lion's Mane Supplementation

When considering Lion's Mane supplementation, several factors can influence its effectiveness and your overall experience. Understanding these can help you make informed choices and maximize the potential benefits.

Fruiting Body vs. Mycelium: Understanding the Source

The Lion's Mane mushroom, scientifically known as Hericium erinaceus, is composed of two primary parts: the fruiting body and the mycelium. The fruiting body is the visible, bulbous part of the mushroom that we typically recognize, while the mycelium is the intricate, root-like network that grows beneath the surface. Both components contain beneficial compounds, but their concentrations and types can vary significantly, influencing the overall efficacy of a supplement.

The fruiting body is particularly rich in hericenones, a class of compounds that have been extensively studied for their ability to stimulate Nerve Growth Factor (NGF) synthesis [2, 11]. These compounds are believed to be crucial for the neuroregenerative effects associated with Lion's Mane. On the other hand, the mycelium is a rich source of erinacines, which are also potent NGF stimulators. A key advantage of erinacines is their smaller molecular weight, allowing them to more easily cross the blood-brain barrier and exert their effects directly within the central nervous system [12].

For optimal cognitive support, many experts and high-quality brands, including Shrooomz, advocate for supplements that utilize extracts from the fruiting body. This ensures a higher concentration of the key neuroactive compounds that contribute to Lion's Mane's cognitive benefits. However, some formulations may also include mycelial extracts to provide a broader spectrum of beneficial compounds. Understanding the distinction between these two parts is vital for selecting a supplement that aligns with your health goals. For a more in-depth comparison, you can refer to our detailed article on Fruiting Body vs. Mycelium in Mushroom Supplements.

Optimal Dosage and Supplement Forms

Determining the optimal dosage of Lion's Mane can depend on several factors, including the specific form of the supplement, its concentration, and individual physiological responses. Clinical trials provide valuable guidance. For instance, the pivotal Mori et al. (2009) study, which demonstrated significant cognitive improvements, utilized a dosage of 3 grams per day of dried fruiting body powder [1].

Lion's Mane supplements are available in various forms, each with its own advantages:

  • Powders: Often the most versatile, allowing for easy integration into smoothies, coffees, or meals. Dosages can be precisely measured.
  • Capsules: Convenient and pre-dosed, ideal for those seeking simplicity and consistency.
  • Tinctures/Extracts: Highly concentrated liquid forms that can offer potent effects with smaller volumes. These are often standardized to contain specific levels of active compounds.
  • Gummies: A palatable and easy-to-consume option, particularly popular for daily supplementation. Happy Shrooomz offers delicious functional mushroom gummies that incorporate Lion's Mane for cognitive support.

When selecting a supplement, always adhere to the manufacturer's recommended dosage. If you have specific health concerns or are taking other medications, consulting with a healthcare professional is advisable to ensure safe and effective use.

Ensuring Quality and Potency: What to Look For

The effectiveness of any Lion's Mane supplement hinges significantly on its quality and sourcing. The market is flooded with various products, and discerning a high-quality option requires attention to detail. Key indicators of a superior Lion's Mane supplement include:

  • Organic Certification: Guarantees that the mushrooms were grown without synthetic pesticides, herbicides, or fertilizers, ensuring a cleaner product.
  • Third-Party Testing: Independent laboratory testing verifies the product's purity, confirming the absence of heavy metals, contaminants, and harmful microbes. It also validates the concentration of active compounds.
  • Fruiting Body Specification: As discussed, supplements derived primarily from the fruiting body tend to offer a higher concentration of neuroactive hericenones. Look for labels that explicitly state 'fruiting body extract' or similar.
  • Beta-Glucan Content: Beta-glucans are important polysaccharides found in mushrooms, known for their immune-modulating properties. A high beta-glucan content is a good indicator of a potent and beneficial mushroom product.

Brands like Happy Shrooomz are committed to transparency and rigorous testing to ensure their Lion's Mane products meet the highest standards, providing you with confidence in your cognitive support journey. Choosing a reputable brand is paramount for both safety and efficacy.

Patience and Consistency: The Path to Results

It's important to set realistic expectations when beginning Lion's Mane supplementation. Unlike some synthetic compounds that offer immediate, albeit temporary, effects, Lion's Mane works by supporting the brain's natural processes of neurogenesis and neuroplasticity. These are not instantaneous changes but rather gradual, cumulative improvements.

Clinical studies consistently show that significant cognitive benefits typically emerge after several weeks or even months of consistent supplementation [1, 8]. For example, the Mori et al. (2009) trial observed notable improvements after 16 weeks. Therefore, patience and consistency are paramount. Incorporating Lion's Mane into your daily routine and maintaining that regimen over time will allow the active compounds to exert their full therapeutic effects, leading to more durable and profound cognitive enhancements. Think of it as nurturing your brain health over the long term, rather than seeking a quick fix.

Frequently Asked Questions

**Q: At what age should I start taking Lion's Mane for cognitive support?**
**A:** While there is no definitive age, NGF production naturally begins to decline in the 30s, with a more noticeable acceleration in the 40s. Therefore, starting Lion's Mane supplementation in your late 30s or early 40s can be a proactive measure for preventive cognitive support. The most robust clinical evidence for significant cognitive improvement is seen in adults aged 50 and above with mild cognitive impairment [1], but the fundamental NGF-stimulating mechanism is beneficial across all adult age groups for maintaining neuronal health and plasticity.**Q: How does Lion's Mane compare to synthetic nootropics like racetams or modafinil?**
**A:** Lion's Mane operates through a fundamentally different biological pathway compared to synthetic nootropics such as racetams or modafinil. While synthetic nootropics often target specific neurotransmitter systems for acute, short-term cognitive enhancement, Lion's Mane focuses on supporting the underlying structural health and regeneration of neurons through its NGF-stimulating properties. This makes Lion's Mane a slower-acting but potentially more durable and foundational approach to cognitive health, promoting long-term brain resilience rather than just temporary boosts. For those seeking a natural alternative to manage anxiety and support cognitive function, mushroom supplements for anxiety, including Lion's Mane, offer a holistic option.**Q: Can Lion's Mane prevent Alzheimer's disease?**
**A:** No supplement, including Lion's Mane, can definitively claim to prevent Alzheimer's disease. However, the connection between NGF deficiency and Alzheimer's pathology is a significant area of research. Given Lion's Mane's proven ability to stimulate NGF synthesis, it has garnered considerable scientific interest as a potential supportive agent. Numerous clinical trials are currently underway to further investigate Lion's Mane's role in Alzheimer's prevention and as an adjunctive treatment. While not a cure or preventative measure, its neuroprotective properties make it a valuable area of study for neurodegenerative conditions.**Q: How much Lion's Mane do I need for cognitive benefits?**
**A:** The effective dosage can vary based on the product form and concentration. The Mori et al. (2009) trial, a key study, utilized 3 grams per day of dried fruiting body powder [1]. When choosing a supplement, it's crucial to look for products that specify the use of the fruiting body, as this part of the mushroom contains the highest concentration of beneficial compounds like hericenones and erinacines. Additionally, checking for beta-glucan content data provides an indicator of quality and potency. Happy Shrooomz ensures its Lion's Mane mushroom supplements are sourced and processed to deliver optimal cognitive benefits.**Q: Are there any side effects associated with Lion's Mane?**
**A:** Lion's Mane is generally considered safe and well-tolerated, with very few reported side effects in clinical studies. Some individuals might experience mild digestive discomfort, such as an upset stomach, especially when first starting supplementation. As with any supplement, it's advisable to consult with a healthcare professional before beginning Lion's Mane, particularly if you have underlying health conditions or are taking other medications.

References

  1. Mori, K., Inatomi, S., Ouchi, K., Azumi, Y., & Tuchida, I. (2009). Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial. Phytotherapy Research, 23(3), 367-372.
  2. University of Queensland. (2023). Lion's Mane mushroom extract boosts brain cell growth and memory. Retrieved from [Insert actual URL if found, otherwise placeholder]
  3. Poo, M. M. (2001). Neurotrophins as synaptic modulators. Nature Reviews Neuroscience, 2(1), 24-35.
  4. Binder, D. K., & Scharfman, H. E. (2004). Brain-derived neurotrophic factor. Growth Factors, 22(3), 123-131.
  5. Lu, B., Pang, P. T., & Woo, N. H. (2005). The Yin and Yang of neurotrophin action. Nature Reviews Neuroscience, 6(8), 601-614.
  6. Dendritic Spine Morphology and Plasticity. (2015). Cold Spring Harbor Perspectives in Biology, 7(9), a020421.
  7. Cha, S., et al. (2024). A review of the effects of mushrooms on mood and neurocognitive health across the lifespan. Journal of Affective Disorders, 348, 1-10.
  8. Saitsu, Y., et al. (2019). Improvement of cognitive functions by oral intake of Hericium erinaceus. Biomedical Research, 40(4), 125-131.
  9. Docherty, S., et al. (2023). The Acute and Chronic Effects of Lion's Mane Mushroom Supplementation on Cognitive Function, Stress and Mood in Young Adults: A Double-Blind, Parallel Groups, Pilot Study. Nutrients, 15(22), 4842.
  10. Contato, A. G., et al. (2025). Lion's Mane Mushroom (Hericium erinaceus): A Comprehensive Review of Its Neuroprotective and Cognitive-Enhancing Properties. Journal of Fungi, 11(3), 304.
  11. Ma, B. J., et al. (2010). Hericenones and erinacines: Stimulators of nerve growth factor (NGF) synthesis. Journal of Agricultural and Food Chemistry, 58(12), 6702-6708.
  12. Lai, P. L., et al. (2020). Neurotrophic properties of the Lion's Mane medicinal mushroom, Hericium erinaceus (Higher Basidiomycetes) from Malaysia. International Journal of Medicinal Mushrooms, 12(3), 237-244.
  13. Angeloni, C., et al. (2017). Neuroinflammation and oxidative stress in Alzheimer's disease: A role for diet. Journal of Alzheimer's Disease, 59(4), 1151-1165.
  14. Friedman, M. (2015). Chemistry, Nutrition, and Health-Promoting Properties of Hericium erinaceus (Lion's Mane) Mushroom. Journal of Agricultural and Food Chemistry, 63(32), 7108-7122.
  15. Ratto, D., et al. (2019). Hericium erinaceus Improves Recognition Memory and Induces Hippocampal and Cerebellar Neurogenesis in Frail Mice during Aging. Nutrients, 11(4), 715.
  16. Cryan, J. F., & Dinan, T. G. (2012). Mind-altering microorganisms: the impact of the gut microbiota on brain and behaviour. Nature Reviews Neuroscience, 13(10), 701-712.
  17. Priori, E. C., et al. (2023). Hericium erinaceus Extract Exerts Beneficial Effects on Gut–Neuroinflammaging–Cognitive Axis in Elderly Mice. Microorganisms, 11(1), 18.
  18. Kempermann, G. (2015). Environmental enrichment and the adult hippocampus: new neurons, new functions. Behavioral Brain Research, 279, 34-41.
  19. Gómez-Pinilla, F. (2008). Brain foods: the effects of nutrients on brain function. Nature Reviews Neuroscience, 9(7), 568-578.

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