Neurons here are responsive to tactile stimuli, visual stimuli, and auditory stimuli. A hallucination is defined as sensory perception in the absence of external stimuli. One method for creating subliminal auditory stimuli is called masking. Receptors respond in different ways to stimuli. This may result from any of various physiological stimuli, including sexual arousal. Information is the meaning of these sensory stimuli ("i.e.", the empirical perception). NLRP3 is activated by cellular events induced by different PAMPs and DAMPs stimuli. They may be spontaneous or triggered by external visual stimuli. Relational responding is a response to one stimulus in relation to other available stimuli. The right amygdala is associated with response to fearful stimuli as well as face recognition. Emotions are complex chains of events triggered by certain stimuli. Much longer chains can be built by adding more stimuli and responses. Interferons can disrupt signaling by other stimuli. Stupor is characterised by impaired reaction to external stimuli. The cognitive refers to the actual processing of the stimuli.