What is the Cocktail Party Effect?

Jennifer Clinehens

minute read

Quick Definition: The Cocktail Party Effect says that people focus on the information most relevant to them (like our name, or personal information). 

It seems like every company is chasing personalization. In fact, almost 70% of brands surveyed in an Everstring report called it a “top priority.”It could be easy to write personalization off as a shiny object, if not for the financial returns.

In their 2019 Personalization Development Study, Monetate outlined the ROI of personalized marketing:

  • Personalized marketing drives growth: 93% of companies with an “advanced personalization strategy” saw revenue growth. Only 45.4% of companies without a personalization strategy saw equivalent growth.
  • The higher the investment, the better the returns: Companies with ROI of 2x or more said personalization made up at least 20% of their marketing budget.
  • Personalization drives long-term customer value: Brands that had the highest personalization ROI (3x or more) focused on loyalty as their top KPI. Companies with lower ROI targeted short term measures like average order value.

It’s clear there’s evidence supporting personalization. It compels customers to act, and they’re actively asking for more. In a recent study, Infosys found that 31% of customers wish their experiences were “far more” personalized.

But why? The answer lies in a psychological principle known as the Cocktail Party Effect.


What is the Cocktail Party Effect?

The Cocktail Party Effect was discovered in the 1950s by a British Cognitive scientist named Colin Cherry. Cherry wanted to understand what people focus on and why. After researching the dynamics of a noisy room, he discovered something interesting. Our brain separates overlapping conversations and background noise into different auditory streams. It can then decide to ignore information that isn’t relevant. 

The Cocktail Party Effect says that people focus on the information most relevant to them (like our name, or personal information). According to a study published in the journal Brain Research, a key trigger for “tuning in” is when people hear their name. Given the research, it makes sense that brands start personalization efforts with a customer’s name.

But the Cocktail Party Effect shows if we go deeper, relevant content can drive incredible results.


Beyond a Name: What is "True" Personalization? 

Personalization isn’t about getting your customer’s first name right then spamming them with impersonal ads. As Seth Godin says:

“[Personalization] is a chance to differentiate at a human scale, to use behavior as the most important clue about what people want and more important, what they need.”

True personalization is deeply understanding your customer’s journey. Once you know what they need, you can serve them the right message at the right time, and drive business results.


How to Apply the Cocktail Party Effect 

1. Get specific about your customer’s world

In a recent study, research firm Elastic found the personalization tactics that have a direct effect on buying behavior:

  • 84% of shoppers say personalization already influences their decision to shop with specific brands.
  • 68% of online shoppers have purchased an item they didn't initially intend to when product recommendations were personalized.
  • 88% of customers are more likely to continue shopping on a website that offers a personalized experience.


In this email from Monica Vinader, the brand uses customer data in a smart way. They’ve not only customized Kim’s name in the email (“Made for You Kim”). They’ve also used images of “K” monogrammed jewelry, and shown a necklace based on Kim’s past purchases.

Monica Vinader personalized email

Source: Monica Vinader

2. Personalize your marketing’s visuals, copy, and message

In their 2018 Ecommerce Quarterly Report, Monetate discovered that just three pages of personalized content can double conversion rates. 

Monetate also found that the value of personalization compounds with each experience. As you can see from the data below, true personalization does more than increase purchases. It gets people to add items to their cart more often and drives down cart abandonment rates.

Monate 2018 Ecommerce Quarterly Report

Source: Monate 2018 Ecommerce Quarterly Report


3. Go deeper with data — and be transparent

Your ability to personalize effectively is directly tied to the state of your brand’s data. And if the data is there, but it isn’t in shape, getting to the right insights might mean digging a little deeper. Further research could take the form of progressive profiling, marketing automation, or just asking your customers if the marketing they’re getting is right for them.


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The Cocktail Party Effect in action: EasyJet

EasyJet, a British low-cost airline, made a company milestone relevant for their customers. Instead of making their 20th anniversary about the brand, EasyJet focused on the consumer. They transformed people’s data into a celebration of their travels with EasyJet.

EasyJet Personalized Email Campaign

Source: Campaign Monitor

The Bottom Line

Personalization might be a top priority for brands, but most haven’t achieved their ambitions. And that’s a problem because, according to Gartner, the stakes are high. In a recent survey, they discovered brands are at risk of losing 38% of their customers because of poor personalization.

There’s no magic button you can press to become immediately personalized. It’s a tough process that requires marketers to work closely with IT, operations, and digital teams. But at the end of the day, the potential for revenue generation is huge. The science supports it, and customers are asking for it.

So instead of asking if you should focus on personalization, the better question is, “How can we prioritize it?”

Learn more when you listen to the Choice Hacking podcast:

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About Jen Clinehens
Jen Clinehens headshot
Welcome to Choice Hacking! 
My name is Jen, I'm the founder and managing director of Choice Hacking.  I've spent my career perfecting omni-channel customer experiences for brands like AT&T, McDonalds, Adidas and more using the power of behavioral science, psychology, and AI. 

Now I spend my time writing case studies and creating courses to help others supercharge their work with science.

My team and I also love helping brands solve their biggest marketing and experience challenges - if that sounds like you, please get in touch to learn more.