Modifiers matching stimulus:

• external,
• stressful,
• monotonous,
• artificial,
• chemical,
• internal,
• noninfectious,
• electrical,
• cytotoxic,
• prolonged,
• sensory,
• physical,
• noxious,
• special,
• damaging,
• extracellular,
• physiologic,
• intense,
• aversive,
• constant,
• physiological,
• inflammatory,
• cellular,
• visual,
• peripheral,
• identifiable,
• simple,
• instructional,
• mechanical,
• diverse,
• distressing,
• psychic,
• natural,
• major,
• light,
• mental,
• emotional,
• abnormal,
• complex,
• ambient,
• outside,
• standard,
• strong,
• environmental,
• pathologic,
• temporal,
• stimulating,
• supplemental,
• neutral,
• chronic,
• detrimental,
• harmful,
• subtle,
• exogenous,
• rewarding,
• old,
• negative,
• positive,
• rhythmic,
• distinct,
• individual,
• multiple,
• organizational,
• subjective,
• unpleasant,
• familiar,
• social,
• adverse,
• local,
• painful,
• transient,
• nonspecific,
• innocuous,
• auditory,
• biological,
• pathological,
• real,
• extraneous,
• pictorial,
• maternal,

Simple categories matching exogenous:

• agent,
• retrovirus,
• toxin,
• substance,
• input,
• opsonin,
• polysaccharide,
• substrate,
• compound,
• issue,
• pathogen,
• opiate,
• event,
• alteration,
• metal,
• cytokine,
• intoxicant,
• glucocorticoid,
• food,
• demand,
• variable,
• dna,
• protease,
• component,
• cause,
• antioxidant,
• molecule,
• particle,
• development,
• stimulus,
• precursor,
• buffer,
• antigen,
• steroid,
• material,
• inducer,
• activator,
• catecholamine,
• phenomenon,
• corticosteroid,
• poison,
• force,
• factor,
• sterol,
• drug,
• protein,
• signal,
• source,
• hormone,
• estrogen,
• disturbance,
• shock,
• inhibitor,
• toxicant,
• authority,
• solute,
• chemical,
• enzyme,
• condition,
• contaminant,
• acid,
• occurrence,
• phosphoprotein,
• carbohydrate,
• amphetamine,
• acceptor,
• amine,
• process,
• ligand,
• hexose,
• stimulant,
• system,
• change,
• asthma,
• base,
• cofactor,
• carcinogen,
• macromolecule,
• control,
• proteinase,
• sugar,