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American Focus > Blog > Tech and Science > Squirty gels bring the taste of cake and coffee to virtual reality
Tech and Science

Squirty gels bring the taste of cake and coffee to virtual reality

Last updated: March 3, 2025 5:09 am
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Squirty gels bring the taste of cake and coffee to virtual reality
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Researchers have developed a groundbreaking device called “e-Taste” that has the ability to deliver virtual tastes by squirting chemicals onto the tongue. This innovative system opens up a world of possibilities for virtual reality experiences where users can not only see but also taste virtual food.

The e-Taste system is able to detect chemicals in food and transmit this information wirelessly to a device that can deliver the same or equivalent chemicals to a user’s tongue. By combining different chemicals, the device can replicate a wide range of flavors, from sweet cake to bitter coffee. This groundbreaking technology was recently reported in the journal Science Advances.

According to materials engineer Yizhen Jia from Ohio State University, this development represents a significant step towards the next generation of human-machine interfaces and virtual reality experiences. The e-Taste system utilizes five edible chemicals including glucose for sweet, citric acid for sour, sodium chloride for salty, magnesium chloride for bitter, and glutamate for savory umami. These chemicals are incorporated into gels within the device, which are then mixed in tiny channels. An electromagnetic pump delivers the mixture to the tongue through a flexible, ribbonlike conduit inserted into the mouth.

In a study to evaluate the effectiveness of e-Taste, researchers had participants distinguish between different intensities of sourness produced by the device. They then created complex tastes such as lemonade, cake, fried egg, fish soup, and coffee based on their chemical compositions. Participants were trained to recognize these flavors, achieving an overall accuracy of nearly 87 percent. While some tastes were easier to identify than others, the results were promising.

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Previous attempts to simulate taste through electrical stimulation of the tongue have been less successful due to the complexity of taste perception. Chemicals have proven to be more effective at reproducing a wider range of tastes compared to electrical stimulation. However, taste alone is not sufficient for a realistic experience. Real coffee, for example, involves not only taste but also smell and texture.

To address this challenge, the researchers are working on incorporating smell using gas sensors and machine learning. They envision applications for e-Taste in immersive gaming and sensory rehabilitation, particularly for individuals who have lost their sense of taste due to conditions like COVID-19.

One potential hurdle for widespread adoption of e-Taste is the willingness of users to wear a device that squirts chemicals onto their tongue. Comfort, appearance, and overall user experience will be critical factors to consider in future developments of this technology. Despite these challenges, the potential for e-Taste to revolutionize virtual experiences and sensory interactions is truly exciting.

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