Which diffusion type involves change in the original idea as it spreads?

The type of diffusion that involves a change in the original idea as it spreads is stimulus expansion diffusion. This process occurs when a specific idea or innovation is adopted and adapted in different contexts, leading to variations that differ from the original concept. For example, when a cultural practice or technological innovation is introduced to a new area, it may be modified to fit local customs, needs, or resources, resulting in a different version of the original idea. This adaptation can be seen in various areas, such as cuisine, technology, and social practices, where influences are integrated into the new culture while still maintaining elements of the original idea. This makes stimulus expansion diffusion particularly effective for understanding how ideas evolve as they spread across different regions or communities.