# Stimuli source vs events **URL:** \ **Category:** Programming & Scripting\ **Tags:** unreal-engine, question\ **Created:** [March 17, 2024, 11:10am UTC](https://forums.unrealengine.com/t/stimuli-source-vs-events/1758019 "2024-03-17T11:10:38Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![Mackan1972](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Mackan1972](https://forums.unrealengine.com/u/Mackan1972)\ **Post date:** [March 17, 2024, 11:46am UTC](https://forums.unrealengine.com/t/stimuli-source-vs-events/1758019/2 "2024-03-17T11:46:30Z")
Update - I found this thread: > [@AI Perception Stimuli Source simply not needed?](https://forums.unrealengine.com/t/ai-perception-stimuli-source-simply-not-needed/509156): > > Testing with AI Perception system, it looks to me, like the AI Perception Stimuli Source Component just is not needed at all. I found this playing with Noise - it simply works with only having an AI Perception Component on the receiving side with configured senses. All actors making noise do not need the Stimuli Source at all. Found [this thread](https://forums.unrealengine.com/t/reportnoiseevent-working-on-actors-without-aiperceptionstimulisource/478648) with same observation. Now doing tests with a Sight Sense turns out, that this one also fires events without having any Stimuli Souce component added … Whose author seems to mirror my own confusion. I thus have to assume that hearing-stimuli sources are completely irrelevant, and one must do everything through ReportNoiseEvent (as far as hearing goes)… --- _[View the full topic](https://forums.unrealengine.com/t/stimuli-source-vs-events/1758019)._