Hard Evidence: Is the teenage brain wired for addiction?

The younger you are when you have your first alcoholic drink, the more likely you are to develop problems later on in life.

As a nation, we are drinking much more than we used to, which is partly attributable to alcohol being cheaper and more available than ever. Many British teenagers get into the habit early, although recent trends suggest this situation is improving (alcohol consumption among teenagers is slightly lower than it was ten years ago).

Nonetheless, drinking alcohol during adolescence is not a good idea, because the younger you are when you have your first alcoholic drink, the more likely you are to develop problems later on in life. The same is true for cigarette smoking and the use of illicit drugs such as cannabis and cocaine.

Rates of teenage drinking are dropping. NatCen

 

Arrested development

Why are adolescents particularly vulnerable to addiction? A large part of the answer comes from our understanding of the neurobiology of brain development during adolescence. The brain does not reach maturity until fairly late in life, with new connections between brain cells being formed right up until people are in their mid-20s.

Importantly, the brain does not mature at a uniform rate. The more primitive regions of the brain, including the reward system and other areas of the subcortex such as those parts that process emotions, reach maturity relatively early (when people are in their early teens).

The prefrontal cortex is a late bloomer. National Institute of Health

The more “advanced” parts of the brain, such as the prefrontal cortex, are not fully developed until much later. In behavioural terms this means adolescents are particularly sensitive to their emotions and to things that are novel and motivationally appealing, but they are relatively unable to control their behaviour and plan for the future.

Taking risks

My research suggests this can explain why some adolescents drink more than others: teenagers who were relatively poor at exerting self-control, or who took more risks on a computer test of risk-taking, were more likely to drink heavily in the future.

This creates perfect conditions for vulnerability to addiction during adolescence, because the motivational “pull” of alcohol and other drugs is very strong, whereas the ability to control behaviour is relatively weak. Many scientists think if adolescents do drink a lot, and if they do it frequently, then this might cause long-lasting changes in the way that the brain is organised, which can make it very difficult to stop drinking.

We certainly see changes in the brains of people with alcohol problems (compared to people without problems), but it can be difficult to work out if alcohol caused those brain changes, or if those people had slightly different brains before they started drinking, and these subtle differences may have led them to start drinking in the first place.

Starting early carries greater risk. NatCen

 

Addiction and behaviour

In principle, adolescent brains could be vulnerable to “behavioural” addictions as well as alcohol and drug addiction, for exactly the same reason. Very few behavioural addictions are officially recognised by psychiatrists and psychologists at the moment (gambling addiction is the only exception).

The Channel 4 documentary Porn on the Brain shown this week asked whether pornography is addictive, and if adolescents could be getting hooked. As shown in the programme, it certainly seems to be the case that a minority of adolescents who use pornography exhibit some of the characteristic features of addiction, such as feeling unable to control their use of porn, and loss of interest in other activities.

Their patterns of brain activity when viewing porn seem to be similar to those seen in people with alcohol and drug addictions when they look at pictures of alcohol and other drugs. It remains to be seen whether addiction to porn will eventually be recognised as a psychological disorder, but it is clear that it can create problems for some adolescents and young adults who use it.

What can be done? Although it’s obvious, parents should do what they can to prevent their children from experimenting with alcohol, smoking and other drugs for as long as possible. The same applies to other things that might eventually be considered “addictive”. School-based prevention programmes can also be successful, including a recent program that is tailored to different personality types and has shown some promise at reducing alcohol consumption in teenagers.

Hard Evidence is a series of articles in which academics use research evidence to tackle the trickiest public policy questions.

Matt Field receives funding from the Medical Research Council, Economic and Social Research Council, Wellcome Trust, British Academy and Alcohol Research UK. He is affiliated with the UK Centre for Tobacco and Alcohol Studies.

This article was originally published at The Conversation. Read the original article.

Teenages making a toast in a pub. Photo: Getty

Matt Field is Professor of Experimental Addiction Research at the University of Liverpool.

Google Allo
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Google Allo: a chat app like WhatsApp – but with only a cursory consideration for your privacy

When will we stop sacrificing security for stickers of muscular bulls wiggling their butts? 

The world already has enough chat apps. When Google’s latest messaging service Allo launched this morning, a cursory glance showed us it had much the same features as Snapchat, WhatsApp, and Facebook Messenger before it. You can doodle on your pictures! Here’s an emoji with heart eyes! Look at this sticker of a bull twerking! Oh-by-the-way-we’re-reading-your-messages-hope-that’s-not-a-problem-bye!

Just like Facebook, Instagram, Skype, and Snapchat, the messages you send on Google Allo are not automatically end-to-end encrypted. This type of encryption – which Whatsapp began using in April – means that only you and the recipient of your message can read it and nobody in between. Messaging apps without end-to-end encryption can store your messages on their servers and access them at any time, as well as hand them over to the government if required by law. The technology academic and author John Naughton has likened it to “sending your most intimate secrets via holiday postcards” and Edward Snowden went as far as too call Google Allo “dangerous”.

But Google has a reason for not using end-to-end encryption (whether it’s a good one or not is up to you). The app includes Google Assistant, a tool which can answer your questions within any chat. In order for this to work, Google naturally needs to access your messages. Its new “Smart Reply” feature also means it reads and analyses your conversations to give you personalised auto-reply suggestions. Despite originally promising that it would only store your chat history for a limited amount of time, Google has now admitted that it will retain the data unless you personally choose to delete it. The app is actively trying to learn as much about you as possible, and then storing the data. 

But while Google Allo doesn’t automatically offer end-to-end encryption, it is receiving praise for the ability to opt in via “Incognito mode”. Once this mode is selected, you have end-to-end encryption on your messages, and you can set them to expire after a certain period of time. Wonderful. Brilliant. Article over. No more worries.

Except by placing the onus on the user to opt in to privacy (rather than opt in to Google Assistant) Google has played a trick that many companies have played before. Amazon recently launched a UK version of Echo, a “constantly listening” smart device that records and stores all of your questions, and gave users the option to mute the machine if they were concerned about privacy. But by its very nature, no one who desires this device is concerned about privacy.

And so too with Google Allo. Anyone worried about Snowden’s warning won’t download it, and those who do download it are unconcerned about, or unaware of, the lack of end-to-end encryption. Even the name, “Incognito mode” makes it sound like something that should be used for shady or saucy goings-on, instead of accepting that, by default, all of your private conversations should stay private.

Which begs the question: why don’t most of us care? Allo’s opt-in encryption is actually a vast improvement on Facebook Messenger’s complete disregard for this privacy measure, and that app has one billion active users. Are we truly so distracted by stickers and emojis that we don’t spare a thought for security? Our general apathy towards personal privacy sets a precedent for a future in which – and really, no tinfoil hats are needed here – none of our conversations are ever private.

You probably don’t care because your conversations are boring (no offence). It doesn’t worry us that the government or the police or big businesses are listening because all we’re talking about is whether to meet the lads in Nando’s at six or six-thirty. But no matter how inane our conversations, we should always protect ourselves from eavesdropping.

This is because, as the way Google search histories are used in court shows, your personal data can easily be misconstrued. If you ever did get in trouble with the police, can you really trust them to understand the private jokes between you and your friends, and not construe malicious meanings in your messages? What if third parties accessed your conversations? Companies already use our social media profiles to target advertisements towards us, but what if they scanned our messages to understand us better? Could your offhand conversation about how sick you’re feeling affect your health insurance claims? Will your message about money trouble prevent you from getting a loan?

These are all hypothetical questions, yes, but they are a path our apathy is driving us down. We’d much rather skip through the Terms and Conditions to get a new flashy feature than really scrutinise the data we’re giving away and how it’s used. Companies know this, which is why they hide behind opt-in features like “Incognito mode” and the “delete chat history” button. They can defend themselves by saying the option is there while simultaneously knowing that most people will never actually use it.

There is no easy way to get the wider world to care about privacy, but thankfully there’s probably no way to get them to care about Allo either. It’s not certain whether the messaging app will fail, but given the success of Google's previous chat apps (Talk or Hangouts, anyone?), it seems likely. Then again, none of those had a sticker of a muscular bull wiggling its butt.

Amelia Tait is a technology and digital culture writer at the New Statesman.