Sonic Chip: How a Potato Chip Experiment Changed the Way We Perceive Taste

In the year when the Greek national football team won the European Championship and Greece hosted the Olympic Games, at the University of Oxford, in the Department of Experimental Psychology, Massimiliano Zampini and Charles Spence set out to prove that the sound of chewing can alter our perception of taste.

The experiment was relatively simple. Participants were asked to eat potato chips while wearing headphones. As they bit into them, researchers manipulated the sound of the crunch in real time. While the product itself remained identical, the acoustic parameters, mainly volume and high-frequency content, were altered. The same chip became a different sensory experience depending on what participants heard. After each bite, they were asked to rate how crunchy and fresh the chip seemed, without knowing that the only variable being changed was the sound.

The results were clear. When the sound contained more high frequencies and greater intensity, the chip was perceived as crunchier and fresher. When the sound was softer or lower in frequency, the exact same bites were rated as less crunchy. The taste itself did not change, but perception did, and at the time, this was considered a revealing insight.

This experiment demonstrated something fundamental about how we function. The brain does not process senses in isolated channels. Crunchiness is not just a mechanical signal received by the mouth. It is an audiovisual event. This process is scientifically known as multisensory integration. The brain composes a unified experience from multiple stimuli. In essence, when something sounds crunchy, the mind experiences it as crunchy, even if the texture does not fully support it.

This is how one of the most talked-about experiments in snack history emerged, earning its creators an Ig Nobel Prize, a satirical award that first makes you laugh and then makes you think.

The experiment opened the door to what is now called neurogastronomy. It showed that crunchiness is not simply a texture but also a quality marker inherited from our evolutionary past. In nature, crunchiness signals freshness, whether it is a vegetable or even an insect, while softness often signals decay and moisture.

The food industry did not waste any time. After 2004, multinational companies began treating the “Sonic Chip” effect almost as doctrine. It is no coincidence that packaging for chips and many snacks has become increasingly noisy. The irritating sound of plastic wrapping, often noticed in dark cinema halls, exists for a reason. It prepares the brain for the crunch that follows.

Research did not stop there. Charles Spence continued exploring how sound influences taste, this time beyond snacks and into complete dining experiences. In later experiments, different musical environments altered the perception of sweetness, bitterness, and acidity. High frequencies enhanced the perception of sweetness, while low frequencies and heavier soundscapes amplified bitterness. This phenomenon is known as crossmodal correspondence, the brain’s tendency to link characteristics across different senses.

One of the most well-known examples came in 2011, when Heston Blumenthal collaborated with Spence at the restaurant The Fat Duck. In the dish “Sound of the Sea,” diners wore headphones and listened to sounds of waves and seagulls from an iPod while eating seafood. Guests who heard the seaside soundscape described the dish as fresher compared to those who ate it without any auditory input. This project is considered one of the earliest examples of applied multisensory gastronomy in a fine dining setting.

This is where things become particularly interesting for gastronomy. If sound can enhance the perception of crunchiness, freshness, or sweetness, it can also function as a tool for sustainability. Imagine a dessert with reduced sugar paired with a composition rich in high frequencies. The brain tends to fill in the missing intensity. The same approach has been tested with bitter vegetables. With the right sonic background, bitterness becomes less aggressive. Even in bar and club environments, this has practical implications. If you want to reduce sugar in a cocktail without compromising perception, sound can work in your favor.

Beyond restaurant sound design, which includes materials, fabrics, and tableware, there is also the issue of urban noise. Studies have shown that environmental noise, such as traffic or machinery, reduces the ability to distinguish flavors. On airplanes, for example, engine noise diminishes the perception of sweetness while enhancing umami, the so-called fifth taste associated with amino acids such as glutamate. Cabin humidity also plays a role, as it reduces olfactory sensitivity. This is why certain in-flight meals can feel more umami-driven than expected. It is not necessarily about the recipe, but about the environment.

In a world that is constantly shifting, where AI is beginning to replace human roles in established professions and the restaurant industry is searching for new ways to differentiate itself, the dining experience can no longer rely solely on the chef and the sommelier. The sound designer is emerging as the third key player, shaping how we experience food in ways we are only beginning to understand.