Perception
P: Perception الإدراك
Conscious awareness of elements in the environment by the mental processing of sensory stimuli
Hallucination
Hallucination الهلوسة False sensory perception occurring in the absence of any relevant external stimulation of the sensory modality involved Auditory, visual, olfactory, gustatory, tactile, etc.
Illusion
Illusion= الوهم = الانْخِداع Perceptual misinterpretation of a real external stimulus.