||Interval timing, the ability to perceive time in the seconds to minutes range, is a vital aspect of behavior. One important factor in determining our sense of the time is the ability to shift attention to and from the stimuli being timed (Meek & Benson, 2002). The centromedian/parafascicular (CM/Pf) nucleus of the thalamus has recently been implicated in the ability to shift attention to an unexpected stimulus (Kimura, Minamimoto, Matsumoto, & Hori, 2004). Rats were trained on a simultaneous temporal processing (STP) task in which two durations must be timed independently. Following task acquisition, the CM/Pf was bilaterally lesioned and rats were tested on the STP task. No significant differences were found between control and lesion groups. These results suggest that the ability to accurately attend to two elapsing durations does not require the presence of the CM/Pf in rats.