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Based on โKeep your brain from declining after age 30โ from Big Think Watch the original video
Unlock Your Brainโs Full Potential: A Guide to Lifelong Cognitive Vitality
The human brain, a marvel of biological engineering, is often considered the seat of our consciousness, thoughts, and experiences. Yet, like any intricate system, it undergoes changes with age, leading many to fear an inevitable decline in cognitive function. The good news? Far from being a passive recipient of timeโs toll, your brain is incredibly adaptable, and your daily habits play a profound role in its longevity and performance. Itโs a two-way street: what you do with your body affects your brain, and what you think with your brain influences your bodyโs physiology.
The Inevitable March of Time: Understanding Age-Related Cognitive Shifts
Memory, the cornerstone of our experiences, tends to decrease with age. Our brains, much like the rest of our bodies, naturally age, and their functions donโt maintain the same youthful efficiency. Surprisingly, memory peaks quite earlyโaround age 30โand then gradually declines. This isnโt necessarily a cause for alarm. Forgetting where you left your car keys or glasses, for instance, is a normal part of the aging process. Itโs when you forget that you even wear glasses that we enter the territory of more serious conditions like dementia.
The exact physical mechanisms underlying this decline are still being explored, but plausible candidates include a reduced ability to form new neural connections or to easily adjust the โweightโ of existing connections between nerve cells, known as synaptic weights. This diminished plasticity makes the brain less flexible as we get older. In severe cases, such as Alzheimerโs disease, post-mortem brain examinations reveal plaques and tanglesโabnormal protein deposits that are either causes or residues of cell death. As we age, brain cells can function less efficiently and even die, connections between them diminish, and neurochemical transmitters can face problems. All these physiological shifts contribute to memory challenges. While long-term memories (like your first kiss in high school) often remain intact, short-term recall (what you had for lunch yesterday) can become more challenging.
The Power of Engagement: Fueling a Happy, Functioning Brain
The encouraging reality is that you possess significant agency over your brainโs health. A mentally engaged lifestyle is paramount to keeping your brain happy and functioning well into older age. This isnโt about solving complex equations every day, but rather about consistent, gentle mental stimulation.
The key is to โtrain, not strainโ the brain. Explore activities that you find personally challenging but not overly difficult. This could mean diving into crossword puzzles, embarking on the journey of learning a new language, or mastering a musical instrument. The specific activity matters less than the act of continuous engagement and enjoyment. The brain thrives on novelty and challenge, forming new pathways and strengthening existing ones.
Your Brainโs โBubble Bathโ: The Miraculous Impact of Movement
Perhaps one of the most transformative things you can do for your brain is incredibly simple: move your body. Every single time you engage in physical activity, youโre treating your brain to what experts call a โwonderful bubble bath of neurochemicals.โ This includes a cocktail of feel-good substances like dopamine, serotonin, noradrenaline, and endorphins. These neurochemicals arenโt just for mood; they play crucial roles in learning, memory, and overall cognitive function.
Hereโs the truly good news: you donโt need to be a marathon runner to reap these benefits. Even a mere ten minutes of walking can yield immediate positive effects, reducing anxiety and depression levels. The longevity that comes with exercise is a universal need, offering a potent antidote to cognitive decline.
Beyond the immediate neurochemical boost, exercise also significantly improves blood flow to the brainโa fundamental requirement for its health and vitality. Furthermore, physical activity has been shown to trigger the secretion of Brain-Derived Neurotrophic Factor (BDNF). This powerful signaling molecule, made in the brain, acts like a โwatering can of growth factors,โ causing neurons to grow and improving plasticity in dendrites (the tree-like branches of neurons that receive signals). This enhanced plasticity, fueled by BDNF, directly contributes to improved brain function.
Studies have vividly illustrated the difference between an active and a sedentary brain. Research has shown that individuals who participated in three months of spin class not only reported higher overall mood states but also experienced a significant increase in growth factors circulating through their brains compared to those who played video Scrabble. This physical activity literally helps grow โshiny new hippocampal cellsโ and enhances the function of the prefrontal cortex, vital for decision-making and executive functions.
The Unending Promise of Brain Plasticity
The most hopeful principle underpinning all these strategies is brain plasticity. This extraordinary capacity allows your brain to change, modify, and rewire its connections based on the environment you place it inโincluding your physical activity levels. This means that even if youโve led a sedentary life, itโs never too late to start making changes. Just ten minutes of walking can initiate a shift towards a โbigger, fatter, fluffier, and happier brain,โ leading to better mood, decreased anxiety and depression, and improved focus.
The brain, when challenged, can always do more. In the absence of challenges, we often donโt reach our full potential. As we live longer, staving off cognitive losses by even a few years becomes incredibly important, enhancing our quality of life and independence.
Memory, though sometimes deceptive and stored in โlittle neurochemical packets,โ can indeed be improved with relatively simple strategies and techniques. By actively engaging our minds with enjoyable challenges and consistently moving our bodies, we are not just preserving our brains; we are actively cultivating them. Physical activity stands out as the single most transformative action you can take, not just for your body, but profoundly, for your brain. Itโs a testament to our inherent capacity for growth and adaptation, offering a path to lifelong cognitive vitality.
Based on โA Landmark Supreme Court Ruling on Voting Rightsโ from New York Times Podcasts Watch the original video
Unleashing the Gerrymander: How the Supreme Court Just Reshaped American Democracy
On a pivotal Wednesday, the Supreme Court delivered what many observers are calling a decisive blow to the landmark Voting Rights Act of 1965. This ruling, the third in a series that has progressively eroded the Actโs power, is set to supercharge the already contentious and partisan battle over controlling the nationโs election maps. The decision, dissected by legal expert Adam Liptak and political reporter Nick Corasaniti, promises to fundamentally reshape American democracy, particularly concerning minority voting power and the landscape of political representation.
The Legacy Under Siege: A Triumph for Freedom Undone
The Voting Rights Act of 1965 (VRA) stands as arguably the greatest legislative achievement of the Civil Rights Movement. Born from the struggle to dismantle systemic racial discrimination, its primary purpose was to protect minority voting power. Initially, this meant stopping Southern officials from employing egregious tacticsโfrom violence and poll taxes to literacy tests and โgrandfather clausesโโthat historically kept Black individuals from the ballot box. But the VRAโs scope extended beyond individual voter protection; it was also designed to ensure that minority voters, as a collective, had the genuine opportunity to elect candidates of their choice.
President Lyndon B. Johnson, upon signing the Act, famously hailed it as a โtriumph for freedom.โ And it worked. In Southern states, voter registration and turnout numbers for minority communities, once in single digits, surged, sometimes even surpassing those of white voters. This undeniable success, however, also gave rise to a sustained attack from the political right, particularly Republicans, who noted a high correlation between protecting minority voters and protecting Democratic voters. This pressure, mounting over decades, has now culminated in a series of Supreme Court decisions that have systematically dismantled the VRAโs core protections.
A Trilogy of Diminishment: Hollowing Out the VRA
The recent ruling is not an isolated event but the latest chapter in a โtrilogy of decisionsโ that have collectively rendered the Voting Rights Act largely โtoothless.โ
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2013: Shelby County v. Holder: This decision, often described as cutting the โheart outโ of the VRA, eliminated the requirement for jurisdictions with a history of racial discrimination to obtain federal approval before changing their voting practices (known as โpreclearanceโ under Section 5). This provision had been a critical preventative measure against discriminatory new laws.
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2021: Brnovich v. DNC: This ruling made it exceedingly difficult to sue under the VRA for โvote denialโ claims. These claims typically involved challenges to practices like strict voter ID laws that made it harder for individuals to cast ballots. The Courtโs decision raised the bar for proving such discrimination, effectively shielding many restrictive voting laws from legal challenge.
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Wednesdayโs Ruling: The Final Blow: The most recent decision took aim at the VRAโs remaining bulwark: its protection against vote dilution. This provision was meant to prevent the drawing of election maps that would dilute minority voting power, thereby denying minority groups the opportunity to elect their preferred candidates.
The Louisiana Case and the New Standard: Intent Over Effect
The specifics of the case decided on Wednesday centered on Louisianaโs congressional map. Louisiana, where approximately one-third of the population is Black, had redrawn its six congressional districts. The question was whether the state could create two majority-minority voting districts, a number that, purely by population math, โsounds about right.โ However, the Supreme Court ruled that taking race into account in this manner was unlawful, effectively striking down the creation of the second majority-Black district.
For decades, the VRA had been understood to protect not just an individualโs right to vote, but also the collective power of minority communities to elect their chosen representatives. But with a 6-3 vote, the Courtโs Republican appointees in the majority installed a drastic new test, one that makes it incredibly difficult to consider race when drawing voting districts.
Under this new standard, the Voting Rights Act only โkicks inโ if lawmakers had the explicit intent to discriminate against minority voters. The effect or results of a map, no matter how discriminatory they appear, are no longer sufficient grounds for a challenge. Proving what was โin the lawmakersโ headsโโthat they were motivated by racial animus rather than, say, partisan advantageโis an exceptionally high bar. As one expert noted, a lawmaker could truthfully say, โI donโt mean to discriminate against Black people. I mean to discriminate against Democrats, and Iโm allowed to do that.โ This distinction is crucial because the Supreme Court, in another ruling, has previously declared that partisan gerrymandering (drawing maps to favor one political party) is not subject to review in federal courts. The practical implication is stark: districts drawn to ensure minority voters have the power to elect their candidates are now โin peril across the country.โ
Colorblind Constitution, Clear-Eyed Consequences
The rationale behind the conservative justicesโ ruling stems from a broader ideological stance: a uniform hostility to government decision-making that takes race into account. This courtโs conservative majority often invokes the idea of a โcolorblind Constitution,โ arguing that people should not be sorted based on their race.
Justice Alito, writing for the majority, asserted that while the VRA had a vital role to play historically, โthings have changed.โ He noted that at the time of the Actโs passage, the nation faced โnearly a century of entrenched racial discrimination in voting,โ an โinsidious and pervasive evil.โ However, he argued that the VRA had led to โgreat strides,โ abolishing voting tests, erasing disparities in registration and turnout, and enabling African Americans to attain political office in record numbers. This account of history suggested to him that the law โhas done its job.โ
This perspective directly contradicts the famous dissent of Justice Ruth Bader Ginsburg in the 2013 Shelby County case, where she quipped that โyou donโt throw away your umbrella just because youโre not getting wet.โ Her point was that the VRAโs continued existence was precisely why these gains were sustained, and without it, they might begin to erode.
While Justice Alito maintained that the ruling was narrow, merely โupdating the frameworkโ and โnot abandoning their precedents,โ Justice Elena Kagan, in a scathing dissent, painted a different picture. Writing for the three Democratic appointees, she declared that the VRA, โborn of the literal blood of Union soldiers and civil rights marchers,โ had โushered in awe-inspiring change.โ She lamented that the Act had been โrepeatedly and overwhelmingly reauthorized by the peopleโs representatives in Congress,โ and only they, โnot the members of this court,โ had the right to say it was no longer needed. She concluded, โI dissent then from this latest chapter in the majorityโs now completed demolition of the Voting Rights Act.โ Given the considerable impact of the previous two decisions, many legal observers agree that Justice Kaganโs assessment of the VRAโs โdeconstructionโ holds more weight.
The Redistricting Arms Race Intensifies
The immediate practical implications of this ruling are profound, sparking a new chapter in what has already become a โnational redistricting arms race.โ The โguardrails that were once there that kept legislators in check are now even fewer.โ
- Louisiana: Most directly impacted, its map was struck down. The Republican-controlled legislature and governor face a tight window to redraw districts before early voting. This could result in the elimination of one to two Democratic-leaning districts, making the state more Republican-friendly.
- Other Southern States: South Carolina, Missouri, and Tennessee, which have similar protected districts, could see immediate action. In Tennessee, Republican Senator Marsha Blackburn has openly called for dismantling the stateโs lone Democratic district, a majority-minority seat encompassing Memphis. While there are calendar and geographical challenges, a โruthless gerrymanderโ could split Black voters across multiple Republican districts.
- Florida: Governor Ron DeSantis, anticipating the ruling, had already introduced an aggressive gerrymander that would eliminate four of the stateโs eight Democratic districts. Republicans in the state legislature quickly passed these new maps. While legal challenges are expected, the Supreme Courtโs decision provides a new legal shield, making it harder for Democrats to fight back using the VRA. The message is clear: unless explicit discriminatory intent can be proven, such gerrymandering will likely be deemed legal at the federal level.
Collectively, these actions are expected to create a โslight, but established Republican tiltโ to the maps heading into November, though perhaps not the โmulti-seat cushionโ in the double digits that some Republicans had initially envisioned.
A Blue Counter-Punch? The Spiral into 2028
The ruling is not just about immediate Republican gains; itโs also likely to trigger a more aggressive response from Democrats in states where they control the map-drawing process. While Democrats have already shown their agility in countering Republican gerrymandering in states like California and Virginia, this ruling is expected to โspiral into 2028โ and beyond.
States like New York and Colorado, where Democrats have control, have already begun to explore redrawing their maps. Governors like New Yorkโs Kathy Hochul have indicated a willingness to continue down this path. In states like Illinois and Maryland, where Democrats have complete control and have already drawn aggressive gerrymanders, they could now go โeven further.โ Maryland Democrats might attempt to eliminate the stateโs final Republican seat, and Illinois Democrats could potentially โsplit apart or spread across Chicago voters and eliminate every Republican in that state,โ even if it results in โwacky-looking map with a lot of spaghetti strings.โ The message from Illinois Governor Pritzker was succinct: โWe have options.โ
This dynamic portends a future of โvery brazen form of gerrymanderingโ where, if oneโs party is not in the political majority in a state, their political power is likely to be โtotally neutered.โ
The Future of Black Political Power
One of the most profound and concerning consequences of this ruling will be the dilution of Black political power. Almost certainly, this decision will result in fewer congressional districts having a majority of Black voters. This trend is not new; even before this ruling, Black members of Congress had seen their seats redrawn away in states like Texas, Missouri, and North Carolina.
The impact extends beyond Congress. The ruling creates an opportunity for state and local lawmakers to redraw their own districtsโstate legislative, county, or municipalโto gain a partisan edge. In doing so, they would likely be โdecimating some of these Black-majority districts.โ This is particularly significant because local races often serve as a โpipelineโ for lower elected officials, including Black officials, to gain experience and eventually climb the political ladder to higher office. A reduction in such districts could lead to โless Black leadership in governmentโ overall.
However, thereโs a nuanced โflip side.โ In blue states where Democrats are now emboldened to draw more aggressive maps, there is a possibility that they could create new Democratic districts that are also represented by Black members of Congress. Furthermore, Black voting power within the Democratic Party remains robust, holding an โoutsized impact in the presidential nominating processโ and serving as a โcore blockโ in the Democratic base for general elections. As long as a two-party system persists, their voice โcanโt be erased.โ
Ultimately, the intertwined nature of race and partisanship is undeniable in this new political reality. We are in a โhyper-partisan, hyper-polarized, give-no-inch era,โ where every decision, every redrawing of a map, is driven by the โdesire and a goal of pure partisan power.โ The Supreme Courtโs latest ruling on the Voting Rights Act will only intensify this battle, making it harder to separate the pursuit of partisan advantage from its inherent racial consequences, fundamentally reshaping the very fabric of American democracy.
ํ๊ตญ์ด
โKeep your brain from declining after age 30โ โ Big Think ๊ธฐ๋ฐ ๊ธฐ์ฌ ์๋ณธ ์์ ๋ณด๊ธฐ
30๋๋ถํฐ ์์๋๋ ๋ ๋ ธํ, ๋น์ ์ ๋๋ ์ฌ์ ํ ์ ์ด์ง ์ ์๋ค!
์ฐ๋ฆฌ๋ ํํ ๋์ด๊ฐ ๋ค๋ฉด ๊ธฐ์ต๋ ฅ์ด ์์ฐ์ค๋ฝ๊ฒ ๊ฐํดํ๋ค๊ณ ์๊ฐํฉ๋๋ค. ํ์ง๋ง ๋๋๊ฒ๋ ๋ ๊ธฐ๋ฅ, ํนํ ๊ธฐ์ต๋ ฅ์ 30์ธ ๋ฌด๋ ต์ ์ ์ ์ ์ฐ๊ณ ์ ์ง์ ์ผ๋ก ํ๋ฝํ๊ธฐ ์์ํฉ๋๋ค. ์ด๋ ๋ง์ ์ด๋ค์๊ฒ ์ถฉ๊ฒฉ์ ์ธ ์ฌ์ค์ผ ์ ์์ต๋๋ค. ๊ทธ๋ ๋ค๋ฉด ์ฐ๋ฆฌ๋ ๊ทธ์ ๋ ๋ ธํ๋ฅผ ์ง์ผ๋ด์ผ๋ง ํ ๊น์? ๋คํํ ๊ทธ๋ ์ง ์์ต๋๋ค. ๋น ์ฑํฌ(Big Think) ์ฑ๋์ ์ ๋ฌธ๊ฐ๋ค์ ๋์ ์ ์ฒด์ ๋๋ผ์ด ์ฐ๊ฒฐ๊ณ ๋ฆฌ, ๊ทธ๋ฆฌ๊ณ โ๋ ๊ฐ์์ฑโ์ด๋ผ๋ ํฌ๋ง์ ๋ฉ์์ง๋ฅผ ํตํด 30๋ ์ดํ์๋ ์ ๊ณ ํ๊ธฐ์ฐฌ ๋๋ฅผ ์ ์งํ ์ ์๋ ๊ตฌ์ฒด์ ์ธ ๋ฐฉ๋ฒ๋ค์ ์ ์ํฉ๋๋ค.
๋์ ์ ์ฒด์ ๋๋ผ์ด ์ฐ๊ฒฐ๊ณ ๋ฆฌ: ์ํธ์์ฉํ๋ ์์คํ
์ฐ๋ฆฌ ๋ชธ๊ณผ ๋๋ ์๋ก ๋ฐ์ ํ๊ฒ ์ฐ๊ฒฐ๋์ด ์์ต๋๋ค. ์ ์ฒด ํ๋์ด ๋์ ์ํฅ์ ๋ฏธ์น๊ณ , ๋์์ ์ผ์ด๋๋ ์๊ฐ๊ณผ ๊ฐ์ ๋ํ ์ ์ฒด์ ์๋ฆฌ์ ๋ฐ์์ ์ํฅ์ ์ค๋๋ค. ์ด์ฒ๋ผ ๋์ ๋ชธ์ ์๋ฐฉํฅ์ผ๋ก ์์ฉํ๋ฉฐ, ์ธ๊ฐ์ ๊ฒฝํ์ด ๋๋ฅผ ๋ณํ์ํฌ ์ ์๋ค๋ ์ฌ์ค์ ๋๊ฐ ์์, ์ฌ๊ณ , ๊ฒฝํ์ ์ค์ฌ์ด๋ผ๋ ๊ฒ์ด ์๋ ค์ง ์ด๋๋ก ์ค๊ณง ์ธ์ง๋์ด ์์ต๋๋ค. ๋๋ ์ฑ์ฅํ๊ณ ์ ์ฐ์ฑ์ ์ ์งํ๊ธฐ ์ํด ๋์์์ด ๋ณํํด์ผ ํฉ๋๋ค. ์ด๋ฌํ ๋์ ๋ณํ ๋ฅ๋ ฅ, ์ฆ โ๋ ๊ฐ์์ฑ(Brain Plasticity)โ์ ์ฐ๋ฆฌ๊ฐ ๋์ด๊ฐ ๋ค์ด๋ ๋ ๊ธฐ๋ฅ์ ๊ฐ์ ํ ์ ์๋ค๋ ํฌ๋ง์ ๊ทผ๊ฑฐ๊ฐ ๋ฉ๋๋ค.
30๋๋ถํฐ ์์๋๋ ๋์ ๋ณํ: ์ ์์ ์ธ ๋ ธํ์ ์น๋งค์ ๊ฒฝ๊ณ
๋์ด๊ฐ ๋ค๋ฉด์ ๊ธฐ์ต๋ ฅ์ด ๊ฐ์ํ๋ ๊ฒ์ ์ฐ๋ฆฌ ๋ชธ์ ๋ค๋ฅธ ๊ธฐ๊ด๋ค์ฒ๋ผ ๋๋ ๋ ธํํ๊ธฐ ๋๋ฌธ์ ์์ฐ์ค๋ฌ์ด ํ์์ ๋๋ค. ํ์ง๋ง ๋ชจ๋ ๊ธฐ์ต๋ ฅ ๊ฐํด๊ฐ ๊ฐ์ ์๋ฏธ๋ ์๋๋๋ค. ์๋ฅผ ๋ค์ด, ์ฐจ ํค๋ฅผ ์ด๋์ ๋์๋์ง ์์ด๋ฒ๋ฆฌ๋ ๊ฒ์ ๋์ด๊ฐ ๋ค๋ฉด์ ๋ํ๋๋ ์ ์์ ์ธ ๊ธฐ์ต๋ ฅ ๊ฐํด์ ์ผ๋ถ์ ๋๋ค. ๊ทธ๋ฌ๋ ์์ ์ด ์๊ฒฝ์ ์ฐฉ์ฉํ๋ค๋ ์ฌ์ค ์์ฒด๋ฅผ ์์ด๋ฒ๋ฆฌ๋ ๊ฒ์ ์น๋งค(Dementia)์ ์งํ์ผ ์ ์์ต๋๋ค.
์ด๋ฌํ ๋ ๊ธฐ๋ฅ ์ ํ์ ์ ํํ ๋ฌผ๋ฆฌ์ ์์ธ์ ์์ง ์์ ํ ๋ฐํ์ง์ง ์์์ง๋ง, ์ ๋ ฅํ ๊ฐ์ค ์ค ํ๋๋ ๋๊ฐ ์๋ก์ด ์ฐ๊ฒฐ์ ํ์ฑํ๋ ๋ฅ๋ ฅ์ด๋ ์ ๊ฒฝ ์ธํฌ(Neurons) ๊ฐ์ ์ฐ๊ฒฐ ๊ฐ๋(์๋ ์ค ๊ฐ์ค์น, Synaptic Weights)๋ฅผ ์กฐ์ ํ๋ ๋ฅ๋ ฅ์ด ์ฝํ๋๋ ๊ฒ์ ๋๋ค. ์ด๋ฌํ ๋ณํ๋ ๋๊ฐ ๋์ด๊ฐ ๋ค๋ฉด์ ํน์ ๋ฐฉ์์์ ๋ ์ ์ฐํด์ง๋(๊ฐ์์ฑ์ด ๋จ์ด์ง๋) ์ด์ ๊ฐ ๋ ์ ์์ต๋๋ค. ์์ธ ํ์ด๋จธ๋ณ(Alzheimerโs Disease)์ผ๋ก ์ง๋จ๋ฐ์ ์ฌ๋๋ค์ ๋๋ฅผ ์ฌํ์ ์ดํด๋ณด๋ฉด, ์ธํฌ ์ฌ๋ฉธ์ ์์ธ์ด๊ฑฐ๋ ๊ทธ ๊ฒฐ๊ณผ๋ก ๋ณด์ด๋ โํ๋ผํฌ(Plaques)โ์ โ์ํด(Tangles)โ์ด ๋ฐ๊ฒฌ๋๊ธฐ๋ ํฉ๋๋ค.
์ ์ ๋๋ฅผ ์ํ ํต์ฌ ์ ๋ต: ์์ง์ด๊ณ , ์๊ฐํ๊ณ , ์์์ ๊ณต๊ธํ๋ผ
๊ทธ๋ ๋ค๋ฉด ์ฐ๋ฆฌ๋ ์ด๋ป๊ฒ ๋์ ๋ ธํ๋ฅผ ๋ฆ์ถ๊ณ ๊ธฐ๋ฅ์ ์ต์ ํํ ์ ์์๊น์? ์ ๋ฌธ๊ฐ๋ค์ ๋ช ๊ฐ์ง ํต์ฌ์ ์ธ ์ ๋ต์ ์ ์ํฉ๋๋ค.
1. ๋๋ฅผ ์ํ โํ๋ณต ๋ชฉ์โ: ๊ท์น์ ์ธ ์ ์ฒด ํ๋
์ ์ฒด ํ๋์ ๋ ๊ฑด๊ฐ์ ๊ฐ์ฅ ๊ฐ๋ ฅํ ์ํฅ์ ๋ฏธ์น๋ ์์ ์ค ํ๋์ ๋๋ค. ์ฐ๋ฆฌ๊ฐ ๋ชธ์ ์์ง์ผ ๋๋ง๋ค ๋๋ โ์ ๊ฒฝํํ๋ฌผ์ง(Neurochemicals)โ์ด๋ผ๋ ๋๋ผ์ด โ๊ฑฐํ ๋ชฉ์โ์ ๊ฒฝํํฉ๋๋ค. ์ด ์ ๊ฒฝํํ๋ฌผ์ง์๋ ๊ธฐ๋ถ๊ณผ ๋๊ธฐ ๋ถ์ฌ์ ์ค์ํ ๋ํ๋ฏผ(Dopamine), ํ๋ณต๊ฐ์ ์ฃผ๋ ์ธ๋กํ ๋(Serotonin), ๊ฐ์ฑ๊ณผ ์ง์ค๋ ฅ์ ๋์ด๋ ๋ ธ๋ฅด์๋๋ ๋ ๋ฆฐ(Noradrenaline), ๊ทธ๋ฆฌ๊ณ ํต์ฆ ์ํ์ ์พ๊ฐ์ ์ฃผ๋ ์๋๋ฅดํ(Endorphins) ๋ฑ์ด ํฌํจ๋ฉ๋๋ค.
๋๋ผ์ด ์ฌ์ค์ ๋ง๋ผํค ์ ์์ฒ๋ผ ๊ฒฉ๋ ฌํ ์ด๋์ ํ ํ์๊ฐ ์๋ค๋ ๊ฒ์ ๋๋ค. ๋จ 10๋ถ๋ง ๊ฑธ์ด๋ ๋ถ์๊ฐ๊ณผ ์ฐ์ธ๊ฐ ๊ฐ์์ ๊ฐ์ ์ฆ๊ฐ์ ์ธ ์ด์ ์ ์ป์ ์ ์์ต๋๋ค. ์ด๋์ด ๊ฐ์ ธ๋ค์ฃผ๋ ์๋ช ์ฐ์ฅ์ ํ๋์ธ ๋ชจ๋์๊ฒ ํ์ํ ๊ฒ์ด๋ฉฐ, ์ด๋ ๋์๋ ํด๋น๋ฉ๋๋ค.
์ ์ฒด ํ๋์ ๋ํ โ๋์ ๋์ ๊ฒฝ์์์ธ์(Brain-Derived Neurotrophic Factor, BDNF)โ๋ผ๋ ์ ํธ ๋ถ์์ ๋ถ๋น๋ฅผ ์ด์งํฉ๋๋ค. BDNF๋ ๋์์ ์์ฑ๋์ด ๋ด๋ฐ(์ ๊ฒฝ ์ธํฌ)์ ์ฑ์ฅ์ ๋๋ ์ธ์์ด๋ฉฐ, ํนํ ์์๋๊ธฐ(Dendrites)์ ๊ฐ์์ฑ์ ํฅ์์ํค๋ ๊ฒ์ผ๋ก ์๋ ค์ ธ ์์ต๋๋ค. ์ด๋์ด BDNF ๋ถ๋น๋ฅผ ์ ๋ํ์ฌ ๋์ ๊ฐ์์ฑ์ ๋์ด๊ณ ๊ธฐ๋ฅ์ ๊ฐ์ ํ ์ ์๋ค๋ ์์ด๋์ด๋ ๋ ๊ฑด๊ฐ ์ ์ง์ ์์ด ์ด๋์ ์ค์์ฑ์ ๋์ฑ ๊ฐ์กฐํฉ๋๋ค.
2. ๋๋ฅผ ๊นจ์ฐ๋ โ์ ์ ์ ๋์ โ: ์ธ์ง ํ๋
๋์ด๊ฐ ๋ค๋ฉด์๋ ๋๋ฅผ ํ๋ณตํ๊ณ ์ ๊ธฐ๋ฅํ๊ฒ ํ๋ ๋ ๋ค๋ฅธ ๋ฐฉ๋ฒ์ โ์ ์ ์ ์ผ๋ก ๋ชฐ์ ํ๋ ์ํ ๋ฐฉ์โ์ ์ ์งํ๋ ๊ฒ์ ๋๋ค. ๋๋ ๋์ ์ ๋ฐ์ ๋ ๋ ๋ง์ ๊ฒ์ ํด๋ผ ์ ์์ต๋๋ค. ๋์ ์ด ์์ ๋๋ ์ ์ฌ๋ ฅ์ ์ถฉ๋ถํ ๋ฐํํ์ง ๋ชปํ ์๋ ์์ต๋๋ค. ์ค์ํ ๊ฒ์ ๋๋ฅผ โํ๋ จ์ํค๋ ํน์ฌ์ํค์ง ์๋โ ๊ฒ์ ๋๋ค. ๊ฐ์ธ์ ์ผ๋ก ์ ํธํ๋, ์ ์ ์ ์ผ๋ก ๋์ ์ ์ด์ง๋ง ๋๋ฌด ์ด๋ ต์ง ์์ ํ๋์ ์ฐพ๋ ๊ฒ์ด ์ข์ต๋๋ค. ์ญ์๋งํ์ด, ์๋ก์ด ์ธ์ด ํ์ต, ์ ๊ธฐ ์ฐ์ฃผ ๋ฑ์ด ์ข์ ์์์ ๋๋ค. ๋ค์ํ ํ๋์ ์๋ํ๋ฉฐ ์์ ์๊ฒ ์ฆ๊ฒ๊ณ ํจ๊ณผ์ ์ธ ๊ฒ์ ์ฐพ๋ ๊ฒ์ด ์ค์ํฉ๋๋ค.
3. ํ๋ฅ ๊ฐ์ ๊ณผ ์์ ๊ณต๊ธ
๋๋ฅผ ๊ฑด๊ฐํ๊ฒ ์ ์งํ๋ ๊ฐ์ฅ ์ข์ ๋ฐฉ๋ฒ ์ค ํ๋๋ ๋จ์ํ ๋๋ก ๊ฐ๋ ํ๋ฅ๋ฅผ ๊ฐ์ ํ๋ ๊ฒ์ ๋๋ค. ํ์ก์ ๋ ํ๋์ ํ์์ ์ธ ์ฐ์์ ์์๋ถ์ ๊ณต๊ธํ๋ฉฐ, ๋ ธํ๋ฌผ์ ์ ๊ฑฐํ๋ ์ญํ ์ ํฉ๋๋ค. ๊ท์น์ ์ธ ์ด๋์ ์ฌํ๊ด ๊ฑด๊ฐ์ ์ฆ์ง์์ผ ๋ ํ๋ฅ๋ฅผ ๊ฐ์ ํ๋ ๋ฐ ์ง์ ์ ์ธ ๋์์ ์ค๋๋ค.
๋ ๊ฐ์์ฑ: ํฌ๋ง์ ๋ฉ์์ง
๋ชจ๋ ์ฌ๋์๊ฒ ํฌ๋ง์ด ์๋ ์ด์ ๋ ๋ฐ๋ก โ๋ ๊ฐ์์ฑโ์ด๋ผ๋ ์๋ฆฌ ๋๋ฌธ์ ๋๋ค. ๋ ๊ฐ์์ฑ์ ๋๊ฐ ๋์ธ ํ๊ฒฝ, ์ฆ ๋ฌผ๋ฆฌ์ ํ๊ฒฝ์ ํฌํจํ ๋ค์ํ ์์ธ์ ๋ฐ๋ผ ๋์ ๋ฐฐ์ (wiring)์ ๋ณํ์ํค๊ฑฐ๋ ์์ ํ ์ ์๋ ๋๋ผ์ด ๋ฅ๋ ฅ์ ๊ฐ์ง๊ณ ์๋ค๋ ๊ฐ๋ ์ ๋๋ค. ๋ง์ด ๊ฑท๊ณ , ๋ฐ๊ณ , ์ ์ฒด ํ๋์ ํ๋ฐํ๊ฒ ์ ์งํ๋ ๊ฒ์ โ๊ธ์ ์ ์ธ ๋ ๊ฐ์์ฑโ์ผ๋ก ์ด์ด์ง๋๋ค.
์ ์ ์ธ ๋์ ํ๋์ ์ธ ๋ฌ๋์ ๋๋ ์ด๋ค ์ฐจ์ด๊ฐ ์์๊น์? ๋ฌ๋์ ๋๋ ๋ฌ๋ฆด ๋๋ง๋ค ๋ํ๋ฏผ๊ณผ ์ธ๋กํ ๋ ์์น๊ฐ ๋์์ง๋๋ค. ์ด๋ ์ ๋ฐ์ ์ธ ๊ธฐ๋ถ ์ํ๋ฅผ ํฅ์์ํต๋๋ค. ํ ์ฐ๊ตฌ์์๋ 3๊ฐ์๊ฐ ์คํ ํด๋์ค(์ค๋ด ์์ ๊ฑฐ ์ด๋)์ ์ฐธ์ฌํ ์ฌ๋๋ค์ด ๋น๋์ค ์คํฌ๋๋ธ์ ํ ์ฌ๋๋ค๋ณด๋ค ์ ๋ฐ์ ์ผ๋ก ๋ ๋์ ๊ธฐ๋ถ ์ํ๋ฅผ ๋ณด์์ต๋๋ค. ์ด๋ ๊ทธ๋ฃน ์ฐธ๊ฐ์๋ค์ ๋ ์ ์ฒด, ํนํ ํด๋ง(Hippocampi)์ โ์ฑ์ฅ ์ธ์(Growth Factors)โ๊ฐ ๋ง์น ๋ฌผ๋ฟ๋ฆฌ๊ฐ๋ก ๋ฌผ์ ์ฃผ๋ ๊ฒ์ฒ๋ผ ํจ์ฌ ๋ ๋ง์ด ๊ณต๊ธ๋๋ ํ์์ ๋ณด์์ต๋๋ค. ์ด๋ ์๋ก์ด ํด๋ง ์ธํฌ๋ฅผ ์ฑ์ฅ์ํค๊ณ , ์ ๋์ฝ ํผ์ง(Prefrontal Cortex)์ ๊ธฐ๋ฅ์ ํฅ์์ํค๋ ๊ฒฐ๊ณผ๋ฅผ ๊ฐ์ ธ์์ต๋๋ค.
๋ ๊ฐ์์ฑ์ ์ ๋์ ์ ๋๋ค. ํ์์ ์์์ ๋ณด๋๋ค๊ณ ํด๋, ๋จ 10๋ถ ๊ฑท๊ธฐ๋ง์ผ๋ก๋ ๋๋ฅผ โ๋ ํฌ๊ณ , ํ์ฑํ๋ฉฐ, ํ๊ธฐ์ฐฌ(bigger, fatter, fluffier and happier)โ ์ํ๋ก ๋ณํ์ํค๊ธฐ ์์ํ ์ ์์ต๋๋ค. ์ฐ๊ตฌ ๊ฒฐ๊ณผ, ๋จ 10๋ถ ๊ฑท๊ธฐ๋ง์ผ๋ก๋ ๊ธฐ๋ถ ๊ฐ์ , ๋ถ์๊ฐ ๋ฐ ์ฐ์ธ๊ฐ ๊ฐ์, ๊ทธ๋ฆฌ๊ณ ์ง์ค๋ ฅ ํฅ์๊ณผ ๊ฐ์ ๋์ผํ ์ด์ ์ ๋ฐ๊ฒฌํ ์ ์์์ต๋๋ค.
๊ฒฐ๋ก : ๋น์ ์ ๋๋ ์ฌ์ ํ ์ฑ์ฅํ๊ณ ๋ณํํ ์ ์๋ค
๋์ด๊ฐ ๋ค๋ฉด์ ๋จ๊ธฐ ๊ธฐ์ต๋ ฅ์ ๋ฌธ์ ๊ฐ ์๊ธฐ๊ณ , ๋ ์ธํฌ๊ฐ ๋นํจ์จ์ ์ผ๋ก ๊ธฐ๋ฅํ๊ฑฐ๋ ์ฌ๋ฉธํ๋ฉฐ, ๋ ์ธํฌ ๊ฐ์ ์ฐ๊ฒฐ์ด ์ฝํด์ง๊ณ ์ ๊ฒฝํํ์ ์ ๋ฌ ๋ฌผ์ง์ ๋ฌธ์ ๊ฐ ์๊ธฐ๋ ๋ฑ ๋ค์ํ ์๋ฆฌ์ ๋ณํ๊ฐ ๊ธฐ์ต๋ ฅ ๋ฌธ์ ์ ๊ธฐ์ฌํ๋ ๊ฒ์ ์ฌ์ค์ ๋๋ค. ํ์ง๋ง ๋ ๊ฐ์์ฑ์ด๋ผ๋ ๊ฐ๋ ฅํ ์๋ฆฌ๋ ์ฐ๋ฆฌ๊ฐ ์ด๋ฌํ ๋ณํ์ ์ ๊ทน์ ์ผ๋ก ๋์ํ ์ ์์์ ๋ณด์ฌ์ค๋๋ค.
์ ์ฒด ํ๋์ ๋จ์ํ ๋ชธ๋ฟ๋ง ์๋๋ผ ๋์๋ ๊ฐ์ฅ ํ์ ์ ์ธ ๋ณํ๋ฅผ ๊ฐ์ ธ๋ค์ค ์ ์๋ ์์์ ๋๋ค. ๊พธ์คํ ์ ์ฒด ํ๋๊ณผ ์ ์ ์ ๋์ ์ ํตํด ๋์ ํ๋ฅ๋ฅผ ๊ฐ์ ํ๊ณ , ์ ๊ฒฝํํ๋ฌผ์ง์ ๋ถ๋น๋ฅผ ์ด์งํ๋ฉฐ, ์๋ก์ด ์ ๊ฒฝ ์ธํฌ์ ์ฑ์ฅ์ ์ ๋ํ ์ ์์ต๋๋ค. 30๋ ์ดํ์๋ ์ ๊ณ ํ๊ธฐ์ฐฌ ๋๋ฅผ ์ ์งํ๋ ๋น๊ฒฐ์ ๋ฐ๋ก โ์์ง์ด๊ณ , ๋ฐฐ์ฐ๊ณ , ๋์ ํ๋โ ์ํ ์ต๊ด์ ์์ต๋๋ค. ์ค๋๋ถํฐ ๋จ 10๋ถ์ด๋ผ๋ ๊ฑท๊ธฐ ์์ํ๋ฉฐ ๋น์ ์ ๋์ ๊ธ์ ์ ์ธ ๋ณํ๋ฅผ ์ ๋ฌผํด ๋ณด๋ ๊ฒ์ ์ด๋จ๊น์? ๋น์ ์ ๋๋ ์ฌ์ ํ ์ฑ์ฅํ๊ณ ๋ณํํ ์ค๋น๊ฐ ๋์ด ์์ต๋๋ค.
โA Landmark Supreme Court Ruling on Voting Rightsโ โ New York Times Podcasts ๊ธฐ๋ฐ ๊ธฐ์ฌ ์๋ณธ ์์ ๋ณด๊ธฐ
๋ฏธ๊ตญ ๋๋ฒ์, ํฌํ๊ถ๋ฒ์ ์น๋ช ํโฆ ์ ๊ฑฐ๊ตฌ ์ฌํธ โ๊ฒ๋ฆฌ๋งจ๋๋งโ ์ ์ ๊ฒฉํ ์๊ณ
์ต๊ทผ ๋ฏธ๊ตญ ๋๋ฒ์์ ํ ํ๊ฒฐ์ด ๋ฏธ๊ตญ ๋ฏผ์ฃผ์ฃผ์์ ๊ทผ๊ฐ์ ๋คํ๋ค๊ณ ์๋ค๋ ํ๊ฐ๊ฐ ๋์ต๋๋ค. ํนํ ์์์ ํฌํ๊ถ์ ๋ณดํธํด์จ ์ญ์ฌ์ ์ธ ํฌํ๊ถ๋ฒ(Voting Rights Act)์ด ์ฌ์ค์ โ์ด๋นจ ๋น ์ง ํธ๋์ดโ๊ฐ ๋ ์๊ธฐ์ ์ฒํ๋ฉด์, ๊ตญ๊ฐ ์ ๊ฑฐ๊ตฌ ์ฌํธ์ ๋๋ฌ์ผ ๋นํ์ ์ธ์์ด ๋์ฑ ๊ฒฉํ๋ ์ ๋ง์ ๋๋ค. ๋ด์ํ์์ค ํ์บ์คํธ โ๋ ๋ฐ์ผ๋ฆฌโ๋ ์ด๋ฒ ๋๋ฒ์ ํ๊ฒฐ์ ๋ฒ์ ๋ ผ๋ฆฌ์ ๋ฏธ๊ตญ ๋ฏผ์ฃผ์ฃผ์์ ๋ฏธ์น ํ๊ธ ํจ๊ณผ๋ฅผ ์ฌ์ธต ๋ถ์ํ์ต๋๋ค.
ํฌํ๊ถ๋ฒ(Voting Rights Act)์ ์ญ์ฌ์ ๋๋ฒ์์ โ3๋ถ์โ ํ๊ฒฐ
1965๋ ์ ์ ๋ ํฌํ๊ถ๋ฒ์ ๋ฏธ๊ตญ ์๋ฏผ๊ถ ์ด๋์ ๊ฐ์ฅ ์๋ํ ์ ๋ฒ์ ์ฑ๊ณผ๋ก ๊ผฝํ๋๋ค. ์ด ๋ฒ์ ์์์์ ํฌํ๊ถ์ ๋ณดํธํ๊ณ , ํนํ ๋จ๋ถ ์ง์ญ์์ ํญ๋ ฅ, ์ธ๋์ธ(poll tax), ๋ฌธ๋งน ํ ์คํธ(literacy test), ์กฐ๋ถ ์กฐํญ(grandfather clause) ๋ฑ ๋ค์ํ ์๋ฒ์ผ๋ก ํ์ธ ์ ๊ถ์์ ํฌํ๋ฅผ ๋ง์ผ๋ ค๋ ์๋๋ฅผ ์ ์งํ๊ธฐ ์ํด ๋ง๋ จ๋์์ต๋๋ค. ๋ํ, ์์์ ์ ๊ถ์ ์ง๋จ์ด ์์ ๋ค์ด ์ํ๋ ํ๋ณด๋ฅผ ์ ์ถํ ์ ์๋ ์ง๋จ์