I think discounting effects in inter-temporal choice trials are well explained by exponential discount over perceived (logarithmic) time. See Discounting Time and Time Discounting (Zauberman+ 2008) and Psychophysics of time perception and intertemporal choice models (Takahashi+ 2008). For better models of perceived time, see Timing and time perception (Grondin 2010).
I think discounting effects in inter-temporal choice trials are well explained by exponential discount over perceived (logarithmic) time. See Discounting Time and Time Discounting (Zauberman+ 2008) and Psychophysics of time perception and intertemporal choice models (Takahashi+ 2008). For better models of perceived time, see Timing and time perception (Grondin 2010).