Modifiers matching signal:

• analog,
• audible,
• transient,
• behavioral,
• periodic,
• internal,
• seismic,
• ancillary,
• visual,
• local,
• critical,
• natural,
• auxiliary,
• acoustic,
• electric,
• secondary,
• costly,
• complex,
• specified,
• electrical,
• outside,
• mechanical,
• single,
• standard,
• communicative,
• simple,
• weather,
• ionic,
• demographic,
• sensorial,
• localized,
• heterogeneous,
• biological,
• loud,
• physiological,
• abstract,
• graphical,
• over,
• complicated,
• positive,
• external,
• respiratory,
• meaningful,
• molecular,
• static,
• technical,
• accessible,
• percussive,
• private,
• distinct,
• interfering,
• realistic,
• size,
• detectable,
• directional,
• medical,
• basic,
• auditory,
• perceivable,
• real,
• hemodynamic,
• slow,
• environmental,
• typical,
• intermittent,
• rhythmic,
• digital,
• accidental,
• multiple,
• incoming,
• moving,
• pedestrian,
• special,
• insignificant,
• unique,
• objective,
• world,
• intrinsic,
• electromagnetic,
• functional,
• wideband,
• large,
• unintentional,
• biomedical,
• ambient,
• linear,
• level,
• attractive,
• original,
• neural,
• regular,
• measurable,
• plastic,
• stray,
• remote,
• white,
• diagnostic,
• peripheral,
• temporal,
• physical,
• harmonic,
• common,
• fast,
• chemical,
• intracellular,
• seasonal,
• false,
• difficult,
• specialized,
• rapid,
• underlying,
• tonal,
• stereo,
• familiar,
• developmental,
• clinical,
• endogenous,
• graphic,
• exogenous,
• financial,
• related,
• binary,
• informational,
• important,
• atomic,
• nonrandom,
• resonant,
• noisy,
• sexual,
• abnormal,
• discrete,
• structured,
• significant,
• elementary,
• social,
• logical,
• interactive,
• dynamic,
• vital,
• linguistic,
• driving,
• cellular,
• random,
• primary,
• relevant,
• practical,
• global,
• systemic,
• additional,
• audiovisual,
• unpredictable,
• small,
• sensory,
• pitched,
• visible,
• strong,
• normal,
• broadband,
• cultural,
• verbal,
• pyrotechnic,
• individual,
• physiologic,
• perceptible,
• typographical,
• negative,
• mental,
• extra,
• behavioural,
• high,
• informative,
• subtle,
• out,
• chaotic,
• fixed,
• telegraphic,
• traditional,
• useful,
• metabolic,
• off,
• continuous,
• symbolic,
• electromechanical,
• unwanted,
• diverse,
• identifiable,
• actual,
• undesired,
• intermediate,
• everyday,
• extraneous,
• extracellular,
• erroneous,
• weak,
• male,
• light,
• alert,
• clear,
• repetitive,
• vocal,
• stationary,
• primitive,
• electronic,
• nonverbal,
• defined,
• larger,

Simple categories matching exogenous:

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