Carlson R H, Bridges C V, Williams P S
Percept Mot Skills. 1982 Feb;54(1):111-8. doi: 10.2466/pms.1982.54.1.111.
Subjects who scored highly internal or external on a health locus of control scale and who scored high or low on the value each attached to good health were each given two sessions of frontalis EMG biofeedback training in accordance with a 2 x 2 x 2 factorial design. It was predicted that both internality and high health value would be positively associated with ability to control EMG and that these influences would combine additively. The predictions were not supported but a significant interaction between internality and health value was found. This interaction could be explained by assuming that both internality and high health value increased drive which in turn produced greater muscle tension, the relationship between drive and muscle tension being an ascending sigmoid function.
在健康控制点量表上得分极高或极低的受试者，以及在对健康重视程度上得分高或低的受试者，均按照2×2×2析因设计接受了两阶段的额肌肌电图生物反馈训练。研究预测，内控性和对健康的高度重视都将与控制肌电图的能力呈正相关，且这些影响会叠加。然而这一预测未得到支持，但发现内控性和健康重视程度之间存在显著交互作用。这种交互作用可以这样解释：内控性和对健康的高度重视都会增强驱力，进而产生更大的肌肉张力，驱力与肌肉张力之间呈上升的S形函数关系。
