> ## Documentation Index > Fetch the complete documentation index at: https://docs.askverso.ai/llms.txt > Use this file to discover all available pages before exploring further. # Stimuli > Show images, videos, or PDFs during an interview and give the interviewer useful context. A section can show one image, video, or PDF while the participant reads or answers. Use stimuli for concepts, packaging, advertisements, prototypes, and other material that needs a reaction. ## Choose the format * **Image:** shown inline and available full screen. * **Video:** shown in a player with controls, or as a muted loop when controls are disabled. * **PDF:** shown as a page carousel, which works well for multi-page concepts. Add the stimulus to its section in the **Study guide**. Then use the preview to check its size, legibility, and behavior on a smaller screen. ## Describe it for the interviewer The interviewer receives the **stimulus description**, not the visual file. Describe what appears on screen and any distinctions it may need to discuss. For a packaging comparison, identify each option by a visible feature so the interviewer understands phrases such as "the blue one." For multilingual studies, each language can use a translated stimulus file. See [Languages and translation](/designing/languages-and-translation). Check the stimulus in the participant experience.