The present paper will deal with eye blink frequency and its relationship to scores on “personality” questionnaires and to frontalis and right forearm muscle tension measured electromyographically. This analysis forms part of a larger experiment with the main aim of investigating levels of muscle tension in four groups—(i) introverted neurotics, (ii) extraverted neurotics, (iii) extraverted normals and (iv) introverted normals—during relaxation and while responding to a series of questions about neurotic symptoms.