ARE WE CLOSE TO DECIPHERING THE TIMERS ENIGMA

Among the theoretical models, Gibbon and Church's temporal information processing model is by far the most popular explanatory device in the domain of animal timing, and timing recorded using the peak procedure is considered to reflect pure cognitive time. Neuropharmacological br eakthroughs suggest that different neurotransmitter systems subserve d ifferent functions or stages, as specified by the temporal information processing model. Cerebral activations correlated to timing performan ce have been described in humans. However, several questions remain un answered, particularly those regarding the specificity of the neural a nd biochemical correlates of timing performance. At the behavioral lev el, the dynamic aspects of timing, as well as timing patterns which ca nnot be explained within the framework of existing models, deserve a r enewal of interest.