In the modeling of first generation (Common Module) FLIR performance the effects of obvious focal plane sampling in the vertical (cross-scan) direction were neglected. That methodology used the analog (unsampled) horizontal system quality exclusively as the measure of overall performance. In spite of this, the models were successful because the FLIR focal plane standardization in effect at that time resulted in a relatively fixed relationship between horizontal system quality and overall system performance. Therefore, there was little incentive to investigate the effects of sampling. With the emergence of advanced thermal imagers, the situation in regard to sampling has changed completely. These systems are inherently digital in design and as a result introduce image sampling in both the horizontal and vertical directions. In particular, the imagery from staring focal plane thermal imagers is thoroughly embedded with sampling characteristics since, in the basic system designs, they are limited to one sample per detector spacing in each direction. The experimental study described in this paper was motivated by the need to determine the specific effects of sampling on FLIR performance for these advanced systems, and the extent to which other system characteristics such as pre-filtering and post-filtering MTF's modify the direct effects of sampling. A number of perception experiments have been performed at C2NVE0 wherein sampling, pre-filtering, and post-filtering parameters were varied systematically and the effects on military observer identification and recognition performance were measured. The results of these experiments are being analyzed for incorporation in the Night Vision Advanced FLIR Performance Model.