A motion seat, including a back pan and a seat pan having a forward end, an aft end and opposed left and right sides, comprising: a first aft pivot and a second aft pivot each located on one of said opposed left and right sides of said seat pan, said first aft pivot being connected to said seat pan by a first aft link and said second aft pivot being connected to said seat pan by a second aft link, said first and second aft links (32, 34) being effective in response to pivotal motion of respective first and second aft pivots (28, 30) to raise or lower said seat pan; a first forward pivot and a second forward pivot each located on one of said opposed left and right sides of said seat pan, said first forward pivot being connected to said seat pan by a first forward link and said second forward pivot being connected to said seat pan by a second forward link, said first and second forward links (44, 46) being effective in response to pivotal motion of respective first and second forward pivots (40, 42) to raise or lower said seat pan; a first connecting link extending between said first aft pivot and said first forward pivot, and a second connecting link extending between said second aft pivot and said second forward pivot; a first actuator coupled to said first aft pivot and a second actuator coupled to said second aft pivot, said first and second actuators (66a, 66e) each being movable from a neutral position to a first position and to a second position, each of said first and second actuators (66a, 66e) being operative in the course of movement to said first position to pivot respective first and second aft pivots (28, 30) in a first direction causing said first and second connector links (48, 50) to pivot respective first and second forward pivots (40, 42) in said first direction, each of said first and second actuators (66a, 66e) being operative in the course of movement to said second position to pivot respective first and second aft pivots (28, 30) in a second direction causing said first and second connector links (48, 50) to pivot respective first and second forward pivots (40, 42) in said second direction; said seat pan undergoing roll right motion or roll left motion in response to individual movement of one of said first and second actuators (66a, 66e) in said first direction, said seat pan undergoing upward heave motion or downward heave motion in response to simultaneous movement of both of said first and second actuators (66a, 66e) in said first direction or said second direction. a first aft pivot and a second aft pivot each located on one of said opposed left and right sides of said seat pan, said first aft pivot being connected to said seat pan by a first aft link and said second aft pivot being connected to said seat pan by a second aft link, said first and second aft links (32, 34) being effective in response to pivotal motion of respective first and second aft pivots (28, 30) to raise or lower said seat pan; a first forward pivot and a second forward pivot each located on one of said opposed left and right sides of said seat pan, said first forward pivot being connected to said seat pan by a first forward link and said second forward pivot being connected to said seat pan by a second forward link, said first and second forward links (44, 46) being effective in response to pivotal motion of respective first and second forward pivots (40, 42) to raise or lower said seat pan; a first connecting link extending between said first aft pivot and said first forward pivot, and a second connecting link extending between said second aft pivot and said second forward pivot; a first actuator coupled to said first aft pivot and a second actuator coupled to said second aft pivot, said first and second actuators (66a, 66e) each being movable from a neutral position to a first position and to a second position, each of said first and second actuators (66a, 66e) being operative in the course of movement to said first position to pivot respective first and second aft pivots (28, 30) in a first direction causing said first and second connector links (48, 50) to pivot respective first and second forward pivots (40, 42) in said first direction, each of said first and second actuators (66a, 66e) being operative in the course of movement to said second position to pivot respective first and second aft pivots (28, 30) in a second direction causing said first and second connector links (48, 50) to pivot respective first and second forward pivots (40, 42) in said second direction; said seat pan undergoing roll right motion or roll left motion in response to individual movement of one of said first and second actuators (66a, 66e) in said first direction, said seat pan undergoing upward heave motion or downward heave motion in response to simultaneous movement of both of said first and second actuators (66a, 66e) in said first direction or said second direction.