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Roland Clark Davis (December 20, 1902– February 23, 1961) was an American psychologist recognized for his innovation in instrumentation and measurement of electrophysiological phenomena. Davis’ contributions to the measurement of electrodermal activity, gastric reflexes, and muscle action potentials were essential developments for the field of psychophysiology. He was a productive researcher and teacher, publishing over 70 articles on psychophysiology and related topics in his 30-year career and mentoring many graduate students at Indiana University Bloomington  from 1931 through 1961.

Personal history
Born in Cambridge, Massachusetts on December 20, 1902, Roland Clark Davis was the eldest child of William Chalmers Davis and Effie Estelle Clark. Davis earned his A.B. in English from Harvard in 1924 and his Ph.D. from Columbia in 1930. Upon leaving Columbia, Davis briefly worked as a research associate for the University of Virgina. Davis married Francis Oliver Meacham on September 12, 1927, in Petersburg, Virginia. They had two children, Susan Oliver and Christopher Meacham. In 1931, Davis was hired as an Acting Associate Professor at Indiana University where he established his psychophysiology laboratory in Science Hall. Davis died on February 23, 1961, at the age of 58 in Yellow Springs, Ohio. He was returning home from a meeting with John and Beatrice Lacey at the Fels Research Institute when he suffered a heart attack.

Professional contributions
At Columbia, Davis was mentored by Robert Sessions Woodworth and Albert Poffenberger. In his 1930 dissertation, “Factors Affecting the Galvanic Reflex,” Davis reviewed hundreds of published articles on the galvanic skin response (GSR), producing the most thorough and systematic review of GSR at that time.

Davis pioneered the use of the vacuum tube as a way to control the electrical current during measurement of the GSR. Davis also developed a device that provided an uninterrupted measurement of arterial blood pressure that would not interfere with the subject’s true blood pressure, and he is credited with introducing the cathode-ray oscilloscope technique for measuring muscle action potentials. In collaboration with Douglas Ellson, Irving Saltzman, and Cletus Burke, Davis also developed a lie-detection device.

Davis authored the “first modern description of electrogastrography”. Using gastric balloons and a landmine detector to track the progress of steel balls through the gastrointestinal tracts of volunteers, Davis produced evidence that stomach contractions were largely absent when the stomach was empty, a finding that directly refuted the popular hypothesis of the time that hunger produced the most intense stomach contractions .Davis also used the electrogastrogram (EGG) to study the effects of particular drugs on gastric activity.

Davis also challenged the theory of homeostasis, arguing that the relevant terms needed to be more precisely defined and that responses could be adaptive even if they were not homeostatic:“Homeostasis can be maintained for one variable only at the expense of heterostasis in at least one other”. This line of work led to the restoration of the term heterostasis, as well as the addition of the term allostasis; these concepts were important in propelling regulatory models forward in later years.

Teaching and Leadership
Davis was recognized as a leader in the Department of Psychology, and he was one of the few members of the senior faculty to remain in his position through World War II: “He had almost singlehandedly established the department's reputation in this area before World War II, and had been its leading figure since then“. Davis was also one of the founding members of the Society for Psychophysiological Research.

In his time at Indiana, Davis directed the master's and doctoral theses of 29 graduate students : William Livingston (MA 1932, PhD 1949) Myron Clites (PhD 1934) Oran Wendle Eagleson (PhD 1935) David Craig (MA 1936) William Shaw (MA 1937) Robert Daniel (MA 1938, PhD 1941) Clara Rotter (MA 1942) George Strother (PhD 1942) William Davidson (MA 1943) Rose Shaffer (MA 1943) Robert Urmston (MA 1945) G. Raymond Stone (PhD 1946) Robert Dreher (PhD 1947) Harold Coppock (MA 1950) John Fink (MA 1950, PhD 1953) Donald Van Liere (PhD 1950) Herbert Dawson (MA 1951, PhD 1953) Beatrice Gelber (MA 1941, PhD 1953) John Haralson (PhD 1951) Arthur Kahn (PhD 1952) Zelia Luria (PhD 1052) Rollin Patton (MA 1952, PhD 1953) James Miller (MA 1953) John Brackmann (PhD 1953) Donald Doehring (PhD 1954) Jack Zusman (MA 1956) Neil Kent (PhD 1958) Frederick Gault (PhD 1959) Donald Shearn (PhD 1961)

Electrodermal Activity
A Vacuum Tube for Stablilizing the Current During Measurements of the Galvanic Reflex (1929) Factors Affecting the Galvanic Reflex (1930) Electrical Skin Resistance Before, During, and After a Period of Noise Stimulation (1932) Modification of the Galvanic Reflex by Daily Repetition of a Stimulus (1934)

Homeostasis and Response Patterning
Apparatus for Recording Autonomic States and Changes (1954) Response Patterns (1957) An Exploration of Somatic Response Patterns: Stimulus and Sex Differences (1957) The Pattern of Somatic Response During a Repetitive Motor Task and its Modification by Visual Stimuli (1957) The Domain of Homeostasis (1958)

Action Potentials
A Cathode-Ray Oscilloscope Apparatus for the Psychological Laboratory (1931) Properties of Electrodes Used in Recording Action Potentials from the Intact Organism (1936) Methods of Measuring Muscle Tension (1942) An Integrator and Accessory Apparatus for Recording Action Potentials (1948) Adaptation of the Muscular Tension Response to Gunfire (1949) Autonomic and Muscular Response and Their Relationship to Simple Stimuli (1955)

History of Psychology
American Psychology 1800-1885 (1936) Physiological Psychology: A View of Fifty Years (1958)