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Aided Tracking 10 Aiding with Different Types of Controls 10 The AidinG Required to Track Maneuvering Targets 11 Aiding Ratios 12 The Relative Difficulty of MeaW Int~qrtio and Differentiation 13 APPLICATION OF THE PRIDNCM TO THE DZSWN OF SPELIAL CONTROL SYSTEM DPLAYS is Uburdenn and Quickeal 15 *A Quickiened Display is Quickenitr4 a Filtered Display 17 PAXT 2 A STM MUM-RPOM AMALTM OF T7= BMP,"TCATION PRINCW LZ STaMLUS-REWO5? INTGRITYY Incomplete Umburdml' Taidequate Quickenn LEARNING COMPENSATORY AND-PURUTDUPLAYS-7 "OW LE DGMENT .EFFRENCES 27 N4AVAL HZIARCN LABORATO. V T he man is schematized by the boxes shown above the heavy black line, whtie r.Vmpionents of die machine are block~ed in below. In the human, three sets of organs or func-A tions are important to man-machine system operation, these are the receptors, the central nervous system (CN3), and the effectors. The r,eptors consist of tho sense organs of the body; for example, special coils in the retina of the eye, *he organs of Corti in the ear, ard the proprioceptors in the muscles, tendons, and joints. It to through the receptor organs that changes in energy in the external environment take effect upon the human organism. Such energy changes which excite receptor cells are called stimuli (S). But nr* only Is the organism acted upon by the environment-in turn the man mnodifies the external world through responses; (t) of the effector organs. In the human, the effectors consist of muscles andt glands, thcugi' only the former are directly Involved in manmachine system function.

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