Optogalvanic spectroscopy is a very useful method for observation of optical transitions in plasma media. The optogalvanic effect occurs due to the variation of impedance in a gas discharge when illuminated by a laser beam resonant to an atomic or molecular transition of the gas within the discharge. The change is then fed to an A/D convertor via a capacitor and the result is observed on a monitor. In practice, the laser frequency is scanned while the discharge current is recorded. transition. In resonance condition, a sudden increase in the discharge current is observed, upon the laser shut. Then the current fluctuates and slowly approach its initial value. The temporal behavior of the discharge current depends on the decay rates of the states involved in the transition. In this work the time evolution of the optogalvanic signal for six transitions of neon in the range of 600-630 nm were studied. A dye laser (TDL-90,Quantel,France) pumped by an Nd:YAG (YAG980,Quantel, France) was used as the laser source. Rhodamine 101 was used to produce the laser light in the range of 600 to 630 nm. The line width of dye laser was about 0.08 cm-1 corresponding to 3 pm at 600 nm. A commercial Ag–Ne hollow cathode lamp (Narva, Germany) along with a home-made adjustable dc power supply (200–600 V) was used to create the discharge in neon. Transitions from the states 2p 5 3s [3/2] 1 and 2p 5 3s [1/2] 0 to all configurations of 2p 5 4d and 2p 5 5s were studied. These are all two-photon transitions, previously observed in the laser spectroscopy lab of Isfahan University of Technology. The time evolution for all transitions was the same including; a rapid increase in the current followed by a decrease to bellow the baseline and a slow increase to the baseline. All temporal signals were best fitted to a three exponential sentences function corresponding to the mathematical expression proposed by Han et al. This suggests that three states are involved in construction of the optogalvanic signal. The first state is the lower state 3s, that was depopulated due to the laser shut and gains its population again. The upper states 4d and 5s, although, are populated by the laser shut, they are strongly coupled to the 3p and 4p states so that their population are quickly loaded to the 3p and 4p via radiative decay. Hence the newly populated states 3p and 4p make the optogalvanic signal via relaxation to the steady state condition of the plasma. The experiment was repeated at different discharge current for all transitions. The decay rates for the low state 3s and the two upper states, 3p, 4p were extracted as a function of different discharge currents with an appropriate instrumental time constant.