wavelength thresholds
the minimum and maximum light or sound wavelengths that can be perceived. In the human visual system, wavelength thresholds vary somewhat with intensity but are generally around a minimum of 380 nm and a maximum of 760 nm. Rod and cone functions also may be limiting factors, and species differences account for wavelength thresholds beyond human limits. In the human auditory system, wavelength thresholds are generally between 20 Hz and 20,000 Hz. Wavelength thresholds also vary in the auditory system across species and for different intensities of sound.