The spill-over effect refers to the transfer of effects or emotions from one stimulus to another that is not actually directly related to it. In neuroweb design, knowledge of the spill-over effect can be used to improve the user experience on a website and positively influence the perception of the brand.

One example of the spill-over effect in neuroweb design is the use of colours and visual elements. If certain colours or visual elements are used on a website that are linked to positive emotions or associations, this can lead to users transferring these positive emotions or associations to the brand or product, even if they are not directly linked to the colours or visual elements.

In addition, the spill-over effect can also be used to improve the perception of the brand or product on the website. For example, if designers present social proof or positive reviews from customers on the website, this can lead to users transferring these positive reviews to the brand or product and thus reacting more positively to the brand or product.