a person afflicted with panic disorder is, the more likely they are to use avoidance (social withdrawal) as a coping mechanism. Individuals who have more masculine traits often turn to external coping strategies (for example, alcohol). Bean wrote that while Darwin had great confidence, at the same time he was neurotic, became nervous when his routine was altered, and was upset by a holiday, trip, or unexpected visitor. Colp disputes a diagnosis of agoraphobia, because Darwin dutifully attended 16 meetings of the Council of the Royal Society and was away from home about 2,000 days between 1842 and his death in 1882. However, Barloon and Noyes state that Darwin only left home infrequently, usually accompanied by his wife. They cite Darwin declining an invitation: "I have long found it impossible to visit anywhere; the novelty and excitement would annihilate me." Relationship with father Rempf imputes a psychic cause based on the theory of Oedipal complex, proposing that Darwin's illness was "an expression of repressed anger toward his father" (the physician Robert Darwin). Rempf believed that Darwin's "complete submission" to a tyrannical father prevented Darwin from expressing anger towards his father and then subsequently toward others. In a similar diagnosis, English psychiatrist Dr. Rankine Good stated, "Thus, if Darwin did not slay his father in the flesh, then he certainly slew the Heavenly Father in the realm of natural history," suffering for his "unconscious patricide" which accounted for "almost forty years of severe and crippling neurotic suffering." Sir Gavin de Beer disputed this explanation, claiming a physical causation. Darwin's autobiography says of his father, "... [he] was a little unjust to me when I was young, but afterwards I am thankful to think that I became a prime favourite with him." Bradbury quotes J. Huxley and H.B.D. Kettlew: "The predisposing cause of any psychoneurosis which Charles Darwin displayed seems to have been the conflict and emotional tension springing from his ambivalent relations with his father ... whom he both revered and subconsciously resented." Bradbury also quotes John Chancellor's analysis: "... [Darwin's] obsessive desire to work and achieve something was prompted by hatred and resentment of his father, who had called him an idler and good-for-nothing during his youth." Such psychoanalysis remains controversial, particularly when based only on writings. Relationship with wife, nervousness about being left alone Peter Brent writes in his biography of Darwin, Darwin: A Man of Enlarged Curiosity, that