Short Rehearsal lecture 1

Question 1

Absolute threshold (RL)

Answer 1

limit that indicates the transition between absence and presence of a sensation

Question 2

Differential threshold (DL)

Answer 2

the smallest added stimulus intensity that allows perceiving a difference (JND)

Question 3

Weber’s law (1834)

Answer 3

the stimulus intensity must be increased by a constant fraction of its value in order to obtain a just noticeable difference: k = ΔI / I

Question 4

Fechner (1860)

Answer 4

realized that the absolute threshold (RL) could be used to determine the starting point and the JND to determine a measurement unit (both necessary to truly measure sensations): S = k log R