Final answer:
When a person is influenced by a stimulus that is too weak to be perceived, it is known as a subliminal message.
Step-by-step explanation:
When a person is influenced by a stimulus too weak to be perceived, it is known as a subliminal message. These messages are below the absolute threshold, which means the stimulus is present but not strong enough to be consciously detected. Despite being weak, these subliminal stimuli can sometimes affect our attitudes or behavior, although research suggests their effects are more prominent in lab settings than in real-world scenarios. For example, a person might be exposed to a subliminal advertisement that they do not consciously notice, but it could still potentially influence their thoughts or feelings towards a product.