「サイコパス」といわれる反社会的な人格、サイコパシー(精神病質)をもった人たち。彼らが過去に犯した犯罪の結果から学ぶことができないのは、脳の構造に原因があるからだという研究結果が カナダのモントリオール大学のシャイラ・ホジンス教授と、キングス・カレッジ・ロンドンのナイジェル・ブラックウッド医学博士らによる研究チームによって発表された。
この研究のニュースリリースには、サイコパスの暴力犯罪者は、罰を受けた経験を普通の人と同じように処理できない。そしてそれは罪の意識や、罰から学ぶことに関係した脳の部位に異常があるためだ、と書かれている。
ホジンス教授によると「暴力犯罪者の5人に1人はサイコパス」だという。「サイコパスは再犯率が高く、矯正プログラムを受けてもあまり効果がありません」
サイコパスにはどんな特徴があるのだろうか。「Psychology Today」誌によると、サイコパシーは精神障害の一種であり、この障害を持つ人は、感情が希薄で共感能力に乏しい。
また、サイコパスはやや自信過剰で魅力的な人物に見えることもあるが、同時に人を操ろうとする傾向や攻撃性があり、暴力的であることが多い。男女比についていえば、「The International Journal of Women's Health」誌によると、サイコパスの特徴を示す女性の数は男性よりも大幅に少なく、そうした女性が暴力犯罪を犯す割合も低いとしている。
世間を騒がせた連続殺人事件の犯人、クリフォード・オルソンや、ポール・ベルナルド、テッド・バンディといった人物は、いずれもサイコパスの特徴を示していたと、カナダ公共放送の「CBC News」は報じている。
今回行われた研究では、そういったサイコパスの人たちの脳に何か違いがあるかどうかを調べるため、イギリスの保護観察所にいる暴力犯罪者たちの脳をMRIでスキャンし観察した。
被験者は全員が男性で、32人が反社会性パーソナリティ障害と診断された暴力犯罪者であり、そのうち12人はサイコパスでもあった。彼らは強姦、殺人、殺人未遂、傷害といった罪で有罪判決を受けていた。また、18人の健康な非犯罪者も参加した。
脳をMRIでスキャンしている間、被験者たちには、ある絵合わせのゲームをしてもらった。この絵合わせのゲームからは、参加者が「罰」にどのように反応するかを知る事ができる。
ニュースリリースの中で、ブラックウッド博士は研究の結果をこのように説明している。「神経心理学に関係する課題で、暴力犯罪者たちは罰を示す手がかりがあっても、その手がかりから学ぶことができず、また変化に応じて行動を変えることもできなかった。またより長い時間をかけて考えたにもかかわらず、不適切な判断をすることが多かった」
脳の反応はどうだったのだろうか? ホジンス教授によると、被験者のMRIスキャンから、「サイコパスの暴力犯罪者には、脳の灰白質および特定の白質の両方の線維束に構造的な異常」が見つかったという。白質は脳の各部位の間の情報の伝達を調整し、灰白質は認知機能と情報に関連している部位だ。
具体的にいえば、サイコパスの脳では、灰白質のうち共感・困惑・罪に関連する部分に萎縮が見られた。一方の白質は、罪や報償の経験から学ぶことに関係している部位だが、そこにも異常がみられたという。
加えて、サイコパスの犯罪者は罰に対する「異常な反応」を見せたのに対し、サイコパスではない暴力犯罪者は、「非犯罪者とよく似た脳の働き」とブラックウッド博士は説明している。「こうした結果は、サイコパスの暴力犯罪者は、罰や報償から学ぶことに使われる脳のネットワークの組織に特徴的な違いがある、ということを示唆している」
これらの結果から研究は、サイコパスの犯罪者は自分の行為がもたらすであろう結果のうち、自分にとって都合の良いことだけを考え、都合が悪い面は考えていない可能性がある、と結論づけている。
「罰を受ける可能性を示すサインを読むことは、行動を変えるために必要なことです」と、ホジンス教授は言う。「明らかに、ある状況で犯罪者たちは罰から学んで自分の行動を変えることが困難でした」
ニュースリリースにはまた、問題行動とサイコパスの兆候は小児期の時点ですでに現れていることがあり、この時期であれば「学習を中心した治療」で脳の働き方を変えることができる可能性があるとも書かれている。
ホジンス教授は、サイコパス的な行動を起こさせる脳の働きを中心に治療を行うことで、暴力犯罪を減らせるかもしれない、と述べている。
今回の研究結果では、サイコパスの脳は普通の人の脳と違う働き方をするということが示されたが、一方で2012年にクイーンズ大学が中心となって行った研究は、サイコパスは精神を患っているわけではなく、完全に責任能力があるとしており、研究の主著者ダニエル・クルップ氏は、サイコパスは「自分の行動がもたらす結果を十分に理解している」と述べたという。
この記事はハフポストUS版に掲載されたものを翻訳しました。
[日本語版:水書健司、合原弘子/ガリレオ]
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Psychopaths are social chameleons and can change their psychological spots in the blink of an eye if they think they can benefit from doing so. Playing on sympathy is a favourite weapon of choice.
Make no mistake: psychopaths are confident, outgoing and mentally resilient, hardly ever, in reality, feeling sorry for themselves. But they are also master manipulators and have no qualms whatsoever about tugging on our emotional heartstrings if it works to their advantage.
Sympathy is a powerful motivator – a fact not lost on psychopaths even though they never feel it – and they are extremely adept at eliciting pity and compassion.
WARNING LIGHT: Consistently poor behaviour with frequent appeals to mitigating circumstances and pleas for support and understanding is one of the psychopath’s most recognizable kitemarks – in both the corporate realm and that of everyday life.
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Psychopaths are emotional chess players and a psychopathic boss sees his employees merely as pieces on an invisible psychological chessboard: disposable, dispensable, superfluous.
Psychopaths love to pick people up, move people round, make people jump just for the sake of it - even if, sometimes, it’s not to their immediate benefit. Unnecessary rearrangements of workspace, the sudden imposition of unsocial working hours, and the promise of favours for dishing the dirt on colleagues are just a few psychopathic favourites.
WARNING LIGHT: If you’re left scratching your head on yet another occasion as you try to figure out the rationale for your boss’s behaviour – then the answer might be simpler than you think.
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Psychopaths are past masters at making scintillating first impressions and possess an innate gift for making you feel as if you’re the only person in the room.
They are brilliant psychologists. They know that, through evolution, our brains are programmed to put a lot of store in initial encounters and so they bank substantial emotional ‘capital’ early in a new relationship by turning on the charm.
One psychopath I interviewed put it like this: “Charm is the ability to roll out a red carpet for those you cannot stand in order to fast-track them, as smoothly and efficiently as possible, in the direction you want them to go.”
WARNING LIGHT: If you suddenly find that the red carpet is rolled up and that the charm fades quickly during subsequent meetings with your boss leaving you feeling confused and vulnerable, you may well have a psychopath on your hands.
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Irrespective of whether they play the charm, manipulation or sympathy cards, psychopaths are corporate vampires and are second to none in their ability to take you into their confidence and suck out valuable new ideas that may have been months in the planning.
A typical ploy is the use of reciprocity – a powerful tool of influence. A psychopath might open the bidding and ‘confide’ in you some low-level idea of his own in order that you follow suit with something better. Once in the psychopath’s possession however, the idea is then ‘confiscated’ and, somewhere down the line, suddenly becomes ‘theirs.’
WARNING LIGHT: If your boss has a habit of taking the credit for work done by others, it might be time to look for work elsewhere.
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Psychopaths simply do not live by the same moral code as the rest of us, and experience little guilt or anxiety over telling lies – either to big themselves up, or to dump on others, or both.
In fact, it’s their consummate lack of remorse for misrepresenting the facts that is the single biggest contributor to their inordinate capacity for fabrication. They appear plausible and reasonable and their webs of deceit frequently contain a modicum of truth which they rely on as a safety net should their spurious cover stories come under too close a scrutiny.
WARNING LIGHT: If your relationship with your boss has been plagued by ‘misunderstandings’ and ‘false assumptions’ it might be time to face the real truth.
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Psychopaths are completely driven by their own hard-nosed self-interest. Though they may feign concern for others, appearing warm, considerate and even helpful, such interest is shallow and superficial and merely serves as the foreplay for future exploitation. For psychopath, read “ps-I-chopath.”
Psychopathic relationship patterns - in both personal and corporate settings - are stormy and transient. “Friendships” are often terminated without warning, and ties mercilessly severed once an individual ceases to “be of any use.”
Add to this an arrogant, grandiose and egocentric interpersonal style and you have on your hands a ruthless ambition machine with no “off “switch.
WARNING LIGHT: If your boss has been known to fire people for no apparent reason, or has an ostentatious and extravagant profile out of keeping with a more objective assessment of their standing, or has a habit of stealing the limelight…it’s time to leave them to it.
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Psychopaths make expert defence attorneys and are supremely skilled at getting themselves off the hook should accusations of incompetence be leveled at them.
Not only do they never accept culpability, but they are also extremely adept at manufacturing evidence that lays the blame for their misdemeanours firmly at someone else’s door.
Psychopathic bosses have no qualms whatsoever in using their employees as ‘reputation shields’ to safeguard their own status within the company.
WARNING LIGHT: If your boss has landed you in it through no fault of your own, start asking questions.
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The brain of the psychopath is wired up in a different way to the rest of ours.
In particular, the part of the brain responsible for emotion – the amygdala – is turned down, meaning that psychopaths do not experience the everyday feelings of fear, regret and disgust so familiar to normal folk.
But that doesn’t stop the psychopath acting scared, sorry or surprised in order to manipulate others. They are perfectly adept at putting on shows of emotion if it helps them get ahead.
A common example is extreme anger in response to a perceived personal insult, an alleged betrayal of trust, or the insufficient demonstration of respect for their authority. But such emotional pyrotechnics are purely for shock-and-awe purposes - coolly calculated psychological bombing raids aimed at minimizing the chances of any future “transgressions.”
WARNING LIGHT: If your boss is prone to extreme displays of emotion then quickly returns to normal as if nothing has happened, you should start to question whether he really feels anything at all.
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Imagine someone who has a warped perception of speed: someone who, through some weird trick of nature, perceives things happening at a much slower rate than they actually do.
You wouldn’t want to get in a car with them, would you? Well, it’s exactly the same with psychopaths – except for speed, read danger.
The neural power-cut in the fear zip code of psychopaths’ brains means that things that would scare the hell out of the rest of us just don’t have the same impact on these ice-cool emotional androids.
This, of course, gives psychopaths their enviable sang-froid, their composure under fire – and explains why they often do quite well for themselves in high-wire professions such as the media, finance and certain echelon areas of the military.
But it can, at times, also lead to unnecessary risk-taking – and, to return to the speed analogy, can often result in the car veering out of control and crashing off the road as opposed to a speedier journey time (as if we need any reminding with the global financial crisis.)
WARNING LIGHT: Risky investments, unwise alliances, inappropriate behaviour, risqué comments… if this sounds like your boss you may want to look for another one.
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Psychopaths are attracted to positions of influence in which they can satisfy their need to control and manipulate others.
Last year, I launched the Great British Psychopath Survey. The survey is unique: the first of its kind to assess the prevalence of psychopathic traits within an entire national workforce. What would turn out to be the UK’s most psychopathic profession? I wondered.
The results made interesting reading. CEOs, media folk, lawyers, surgeons, police officers, the clergy…any line of work which boasts a definitive hierarchical infrastructure and affords a position of power over others which may be wielded with relative impunity is ideally suited to the psychopathic personality.
WARNING LIGHT: If your boss has a tendency to step on those beneath him but goes out of his way to impress those above him, it’s time to move sideways…to another department or company.
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Hollywood movies typically portray the psychopath as an intense, menacing figure who makes the hairs on the back of one’s neck stand on end – and there’s evidence to suggest this is true.
Psychopaths often do give out a certain ‘aura’ and folk sometimes report experiencing unnerving physical sensations in their presence such as “he sends a chill up my spine” and “he makes my skin crawl.”
WARNING LIGHT: If you sometimes feel uneasy around your boss, and are uncomfortable being on your own with him for any length of time, trust your gut instinct: GET OUT WHILE YOU STILL CAN!
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