Transduction- Transduction is the process by which foreign DNA is introduced into a cell by a virus or viral vector.
Psychophysics- the branch of psychology that deals with the relationships between physical stimuli and mental phenomena.
Absolute Threshold- the minimum amount of stimulation required to trigger a reaction or produce a sensation
Signal Detection Theory- which at its most basic, states that the detection of a stimulus depends on both the intensity of the stimulus and the physical/psychological state of the individual.