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All human societies are alive with the battle for influence. Every single day each of us is subject to innumerable persuasion attempts from corporations, interest groups, political parties and other organisations. Each trying to persuade us that their product, idea or innovation is what we should buy, believe in or vote for.

In our personal lives the same struggle is played out for the supremacy of viewpoints, ideals and actions. Whether it’s friends and family, work colleagues, potential employers or strangers, each of us has to work out how to bring others around to our own point of view. We all play the influence game, to greater or lesser degrees.

Psychologists have been studying how we try to influence each other for many years. In an 18 part blog series on PsyBlog, Jeremy Dean, researcher at University College London, has been covering some highlights of this research, which are collected below.

1. 3 Universal Goals to Influence People
Effective influence and persuasion isn’t just about patter, body language or other techniques, it’s also about understanding people’s motivations. Central to the art and science of persuasion is understanding three goals for which everyone is aiming.

2. The Persuasive Power of Swearing
Show your passion and people have one more emotional reason to come around to your point of view. But how can we convince others of our conviction? Light swearing at the start or end of a persuasive speech can help influence an audience.

3. Loudest Voice = Majority Opinion
Even if only one member of a group repeats their opinion, it is more likely to be seen by others as representative of the whole group.

4. Don’t Take No For An Answer
You ask someone for a favour and they say no. Where do you go from there? Dealing effectively with objections can be more powerful than other standard methods of persuasion.

5. The Influence of Fleeting Attraction
Friendship is a fantastic lever for persuasion and influence, a lever we happily push on every day. But how much does someone have to like us before we can start to influence them?

6. Caffeine Makes Us Easier to Persuade
Of all the effects caffeine has on our minds—enhanced attention, vigilance and cognition—perhaps least known is its tendency to make us more susceptible to persuasion.

7. Persuasion: The Right-Ear Advantage
If you want someone to comply with a random request for a cigarette, you should speak into their right ear.

8. Balanced Arguments Are More Persuasive
The instinct to paper over weaknesses in our argument is wrong—so long as we counter criticism.

9. The Battle Between Thoughts and Emotions in Persuasion
Nowadays people tend to use ‘I think’ and ‘I feel’ interchangeably. Does it make any difference whether what you say is couched in ‘thinking’ or ‘feeling’ terms?

10. Our Secret Attitude Changes
When you change your attitude about something, do you know why? Psychologists have argued that the inner workings of our minds are largely hidden away from us. One aspect of this is the surprising finding that people are often unaware when they have changed their attitudes.

11. Are Fast Talkers More Persuasive?
Beware the fast-talker, the person with the gift of the gab—the friendly salesman, the oily politician—running through the ‘facts’ faster than you can keep up.

12. Persuasion: The Sleeper Effect
Any time we receive a persuasive message before we find out who the source is, the sleeper effect can come into play.

13. Communicating Persuasively: Email or Face-to-Face?
Face-to-face communication is usually most persuasive but it’s not always possible to meet in person. How, then, do people react to persuasion attempts over email?

14. The Influence of Positive Framing
Do people really pay more attention to frightening messages? Actually emphasising the positive can be more persuasive than pointing out the negative.

15. The Illusion of Truth
Repetition is used everywhere: advertising, politics and the media. It seems too simplistic that just repeating a persuasive message should increase its effect, but that’s exactly what psychological research finds (again and again).

16. 9 Propaganda Techniques in Michael Moore’s Fahrenheit 9/11
Back in the Summer of 2004 Michael Moore brought out ‘Fahrenheit 9/11′, his personal view of how terrorist attacks in the US were used to pursue illegal wars. This article examines the psychological techniques of persuasion used in that film.

17. Persuasion: The Third-Person Effect
Attractive woman holding a bottle of beer? Hah! How stupid do they think we are? Many people say that persuasion attempts have little or no effect on them. Other people, oh sure, adverts, work on them. But not you and I, we’re too clever for that.

18. 20 Simple Steps to the Perfect Persuasive Message
Perfection is hard to achieve in any walk of life and persuasion is no different. It relies on many things going just right at the crucial moment; the perfect synchronisation of source, message and audience. But even if perfection is unlikely, we all need to know what to aim for.