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William D. Timberlake (19 November 1942 – 17 October 2019) was a psychologist and animal behavior scientist. His work included behavioral economics, contrast effects, spatial cognition, adjunctive behavior, time horizons, and circadian entrainment of feeding and drug use. He is best known for his theoretical work: Behavior Systems Theory and the Disequilibrium Theory of reinforcement.

Timberlake earned his PhD in experimental psychology at University of Michigan in 1969 under the supervision of David Birch. He joined the Indiana University psychology faculty the same year, where he remained for the rest of his career, becoming adjunct member of the biology department, and member of the cognitive science programme.

Timberlake was the key mover behind the establishment of the interdepartmental animal behavior programme and Center for the Integrative Study of Animal Behavior (CISAB) at Indiana University (co-founded with biologist Ellen Ketterson). CISAB is a cross-disciplinary research and training unit designed to engender cross-disciplinary cooperation, for which its independence from any department was considered important. The animal behavior programme was among the world's first academic entities to issue degrees specifically in animal behavior.

Timberlake established (with co-chair, James Holland) an ethics committee to oversee animal research on the Bloomington campus (the ancestor of today's BIACUC, Bloomington Institutional Animal Use and Care Committee). Timberlake also established research ethics courses and assured that they remained a part of core curricula of the animal behaviour programme at Indiana University. He served on the Campus Committee on Teaching Ethics in Science from 1989, then on the Board of Fellows of the Poynter Center for the Study of Ethics from 1993.

Timberlake coined the term theriomorphic. A theriomorphic approach is species-centred, one that is based on an explicit model of the animal studied.

Timberlake's work continues to be highly influential. His work features in multiple chapters of field textbooks (e.g. Domjan's “Principles of learning and behavior”; Sara Shettleworth’s “Cognition, evolution, and behavior”). Timberlake's scientific contributions have been recognised with awards, including the Pavlovian Society’s Research Award. He served on the editorial boards of all the field's major journals. Timberlake was a fellow of the American Association for the Advancement of Science, was a fellow and held multiple offices of three APA (American Psychological Association) divisions, and served as president of APA's Division 6. In 2019, a special issue of Behavioural Processes dedicated to Timberlake's influence was published.

Behaviour systems

Timberlake's behaviour systems approach rejects the separation of functional capacities, such as learning, from the particulars of performance, and begins by modelling performance in a given species and environment. The resultant model is then used to frame an understanding of the focal construct in a specific context.

Disequilibrium theory

Timberlake's disequilibrium approach to reinforcement (also known as: behaviour regulation theory, response deprivation theory, molar equilibrium theory, and disequilibrium theory) resituates the locus of behaviour change from a response strengthening power of particular environmental stimuli envisioned in mainstream views, like food, to constrained activities, like eating. Reinforcement is attributed to the animal's correcting deficits in relative activity rates.

Further reading

Behaviour Systems Theory

• Timberlake, W. (1983). The functional organization of appetitive behavior: Behavior systems and learning. In M. Zeiler & P. Harzem (Eds.), Advances in Analysis of Behaviour, Vol. 3, London: John Wiley & Sons, pp. 177–221.
• Timberlake, W. (1990). Natural learning in laboratory paradigms. In D.A. Dewsbury (Ed.), Contemporary issues in comparative psychology (pp. 31–54). Sunderland, MA: Sinauer Associates.
• Timberlake, William (July 1993). "Behavior systems and reinforcement: An integrative approach". Journal of the Experimental Analysis of Behavior. 60 (1): 105–128. doi:10.1901/jeab.1993.60-105. PMC 1322149. PMID 8354963.
• Timberlake, William (1 December 1994). "Behavior systems, associationism, and Pavlovian conditioning". Psychonomic Bulletin & Review. 1 (4): 405–420. doi:10.3758/BF03210945. PMID 24203549. S2CID 23630643.
• "Motivational Modes in Behavior Systems". Handbook of Contemporary Learning Theories. 2000. pp. 165–220. doi:10.4324/9781410600691-11. ISBN 9781410600691.

Disequilibrium Theory

• Timberlake, William; Allison, James (1974). "Response deprivation: An empirical approach to instrumental performance". Psychological Review. 81 (2): 146–164. doi:10.1037/h0036101.
• Timberlake, William; Wozny, Mark (December 1979). "Reversibility of reinforcement between eating and running by schedule changes: A comparison of hypotheses and models". Animal Learning & Behavior. 7 (4): 461–469. doi:10.3758/BF03209702. S2CID 8488485.
• Timberlake, William (1980). A Molar Equilibrium Theory of Learned Performance. Psychology of Learning and Motivation. Vol. 14. pp. 1–58. doi:10.1016/S0079-7421(08)60158-9. ISBN 9780125433143.
• Hanson, Stephen J.; Timberlake, William (1983). "Regulation during challenge: A general model of learned performance under schedule constraint". Psychological Review. 90 (3): 261–282. doi:10.1037/0033-295X.90.3.261.

References

1. Bowers, Robert Ian (July 2020). "William D. Timberlake (1942–2019)". American Psychologist. 75 (5): 734. doi:10.1037/amp0000630. PMID 32673021. S2CID 220609112.
2. Bowers, Robert Ian. "William D. Timberlake (1942–2019)" (PDF). Conductual. 8: 1–6. doi:10.59792/LARS8639.
3. Arnet, Evan (September 2019). "William Timberlake: An Ethologist's Psychologist". Behavioural Processes. 166: 103895. doi:10.1016/j.beproc.2019.103895. PMID 31276741. S2CID 195812030.
4. Bowers, Robert Ian; Domjan, Michael; Killeen, Peter R. (December 2019). "William Timberlake's legacy of innovation". Behavioural Processes. 169: 103991. doi:10.1016/j.beproc.2019.103991. PMID 31669748. S2CID 204866802.
5. "Behavioural Processes | Legacy of William Timberlake | ScienceDirect.com". www.sciencedirect.com. Retrieved 2020-07-12.
6. "William D. Timberlake". Psychological and Brain Sciences. Retrieved 2020-07-12.
7. "Department of Biology". Department of Biology.
8. "Cognitive Science Program". Cognitive Science Program.
9. "Center for the Integrative Study of Animal Behavior". Center for the Integrative Study of Animal Behavior.
10. Thompson, N. S. (1995-05-31). Perspectives in Ethology: Volume 11: Behavioral Design. Springer Science & Business Media. ISBN 978-0-306-44906-2.
11. "Dr. William D. Timberlake: The Career Achievement Award" (PDF). Animal Behavior Bulletin. 12 (1): 7–8. Summer 2010.
12. Timberlake, William (2007). "Anthropomorphism Revisited". Comparative Cognition and Behavior Reviews. 2: 139–144. CiteSeerX 10.1.1.430.3170.
13. Domjan, Michael P. (12 August 2016). The Principles of Learning and Behavior, Loose-Leaf Version. Cengage Learning. ISBN 9781337275248.
14. Shettleworth, Sara J. (2010). Cognition, Evolution, and Behavior. Oxford University Press. ISBN 9780195319835.
15. "Awards | Pavlovian Society".
16. "AAAS Honorary Fellows | American Association for the Advancement of Science". www.aaas.org.
17. "Past Presidents of Div. 6". apadivisions.org.
18. Special Issue of Behavioural Processes: “Legacy of William Timberlake” (https://www.sciencedirect.com/journal/behavioural-processes/special-issue/10GTX28DGHR)
19. Jacobs, Kenneth W.; Morford, Zachary H.; King, James E. (May 2019). "Disequilibrium in behavior analysis: A disequilibrium theory redux". Behavioural Processes. 162: 197–204. doi:10.1016/j.beproc.2019.02.006. PMID 30831224. S2CID 72334644.

• 1942 births
• 2019 deaths
• 20th-century American psychologists
• Ethologists
• Indiana University faculty
• University of Michigan alumni