My research at the Psychopharmacology Laboratory focuses primarily on animal models of genetic and environmental factors in the etiology of drug abuse and other neuropsychiatric and behavioral disorders. Additional collaborations both within and across laboratories investigate the biological and behavioral mechanisms underlying stress reactivity, natural reward, and choice behavior in rodents and nonhuman primates.

PUBLICATIONS
Journal Articles and Proceedings
1. Roma, P. G., & Riley, A. L. (2007). Cross-fostering and the extinction of cocaine's conditioned aversive effects: Evidence for gene-environment interaction. Pharmacology, Biochemistry and Behavior. Epub ahead of print, June 28, 2007.
2. Roma, P. G., Chen, S. A., Barr, C. S, & Riley, A. L. (2007). Dissociation between the aversive and pharmacokinetic effects of ethanol in female Fischer and Lewis rats. Behavioural Brain Research, 182(1), 51-56.
3. Roma, P. G., Davis, C. M., & Riley, A. L. (2007). Effects of cross-fostering on cocaine-induced conditioned taste aversions in Fischer and Lewis rats. Developmental Psychobiology, 49(2), 172-179.
4. Roma, P. G., Huntsberry, M. E., & Riley, A. L. (2007). Separation stress, litter size, and the rewarding effects of low-dose morphine in the dams of maternally separated rats. Progress in Neuro-Psychopharmacology & Biological Psychiatry, 31(2), 429-433.
5. Roma, P. G., Silberberg, A., Huntsberry, M. E., Christensen, C. J., Ruggiero, A. M., & Suomi, S. J. (2007). Mark tests for mirror self-recognition in capuchin monkeys (Cebus apella) trained to touch marks. American Journal of Primatology. Epub ahead of print, January 25, 2007.
6. Roma, P. G. (2006). The SPIT method for simultaneous and unobtrusive collection of salivary cortisol from individually housed infant monkeys. In G. P. Sackett, G. C. Ruppenthal, & K. Elias (Eds.), Nursery Rearing of Nonhuman Primates in the 21st Century (pp. 429-460). New York: Springer-Verlag.
7. Roma, P. G., Champoux, M., & Suomi, S. J. (2006). Environmental control, social context, and individual differences in behavioral and cortisol responses to novelty in infant rhesus monkeys. Child Development, 77(1), 118-131.
8. Roma, P. G., Flint, W. W., Higley, J. D., & Riley, A. L. (2006). Assessment of the aversive and rewarding effects of alcohol in Fischer and Lewis rats. Psychopharmacology, 189(2), 187-199.
9. Roma, P. G., Ruggiero, A. M., Schwandt, M. L., Higley, J. D., & Suomi, S. J. (2006). The kids are alright: Maternal behavioral interactions and stress reactivity in infants of differentially reared rhesus monkeys. Journal of Developmental Processes, 1, 103-122.
10. Roma, P. G., Silberberg, A., Ruggiero, A. M., & Suomi, S. J. (2006). Capuchin monkeys, inequity aversion, and the frustration effect. Journal of Comparative Psychology, 120(1), 67-73.
11. Roma, P. G., & Riley, A. L. (2005). Apparatus bias and the use of light and texture in place conditioning. Pharmacology, Biochemistry and Behavior, 82, 163-169.
12. Riley, A. L., Davis, C. M., & Roma, P. G. Strain differences in taste aversion learning: Implications for animal models of drug abuse. In S. Reilly and T. R. Schachtman (Eds.), Conditioned Taste Aversion: Behavioral and Neural Processes (in press). New York: Oxford University Press.
13. Davis, C. M., Roma, P. G., Dominguez, J. M., & Riley, A. L. (2007). Morphine-induced place conditioning in Fischer and Lewis rats: Acquisition and dose-response in a fully biased procedure. Pharmacology, Biochemistry and Behavior, 86(3), 516-523.
14. Lombas, A. S., Freeman, K. B., Roma, P. G., & Riley, A. L. (2007). Intravenous cocaine priming reinstates cocaine-induced conditioned place preference. Psicológica, 28, 55-62.
15. Silberberg, A., Roma, P. G., Ruggiero, A. M., & Suomi, S. J. (2006). On inequity aversion in nonhuman primates. Journal of Comparative Psychology, 120(1), 76.
16. Christensen, C. J., Silberberg, A., Hursh, S. R., Roma, P. G., & Riley, A. L. Demand for cocaine over time as assessed by the exponential model of demand. Submitted for publication
17. Rinker, J. A., Busse, G. D., Roma, P. G., Chen, S. A., Barr, C. S., & Riley, A. L. The effects of nicotine on ethanol-induced conditioned taste aversions. Submitted for publication.
18. Roma, P. G., Davis, C. M., Kohut, S. J., Huntsberry, M. E., & Riley, A. L. Early maternal separation and the aversive effects of amphetamine in adult rats. Submitted for publication.
19. Silberberg, A., Roma, P. G., Huntsberry, M. E., Warren-Boulton, F. R., Sakagami, T., Ruggiero, A. M., & Suomi, S. J. On loss aversion in capuchin monkeys (Cebus apella). Submitted for publication.
20. Andrews, R. W., Roma, P. G., Suomi, S. J., & Higley, J. D. Individual differences in hormonal fluctuations and alcohol consumption across the menstrual cycle in rhesus monkeys. Manuscript in preparation.
21. Kohut, S. J., Roma, P. G., Davis, C. M., Dominguez, J. M., & Riley, A. L. Fos expression after chronic cocaine administration in differentially reared male and female rats as adults. Manuscript in preparation.
22. Roma, P. G., Huntsberry, M. E., Christensen, C. J., Ruggiero, A. M., Silberberg, A., & Suomi, S. J. Token exchange and the selective-value effect in capuchin monkeys (Cebus apella). Manuscript in preparation.
23. Roma, P. G., Huntsberry, M. E., Schwandt, M. L., Higley, J. D., Barr, C. S., & Suomi, S. J. Primiparity, multiparity, and HPA axis responses to acute and chronic stress in rhesus monkey mothers. Manuscript in preparation.

CONFERENCE PRESENTATIONS
Poster Presentations
1. Roma, P. G., Huntsberry, M. E., Schwandt, M. L., Barr, C. S., & Suomi, S. J. (2007, November). HPA axis reactivity in primiparous and multiparous rhesus monkey mothers: Implications for the biological bases of post-partum depression. Poster session presented at the annual meeting of the Society for Neuroscience, San Diego, CA.
2. Westerman, A. T., Roma, P. G., & Dominguez, J. M. (2007, November). The antiepileptic primidone impairs male sexual behavior. Poster session presented at the annual meeting of the Society for Neuroscience, San Diego, CA.
3. Riley, A. L., Davis, C. M., & Roma, P. G. (2007, July). Epigenetic factors in drug use and abuse. Invited presentation at University of Granada (Granada, Spain).
4. Riley, A. L., Davis, C. M., & Roma, P. G. (2007, July). Epigenetic factors in drug use and abuse. Invited presentation at Universitat Rovira I Virgili (Reus, Spain).
5. Riley, A. L., Davis, C. M., & Roma, P. G. (2007, July). Epigenetic factors in drug use and abuse. Invited presentation at University of Guelph (Guelph, Ontario, Canada).
6. Christensen, C. J., Silberberg, A., Hursh, S. R., Huntsberry, M. E., Roma, P. G., & Riley, A. L. (2007, June). The reinforcing strength of cocaine is less than food but increases with increased cocaine self-administration experience as measured using a recently developed exponential model of demand. Paper presented at the annual meeting of the International Society Group Investigating Drugs as Reinforcers, Quebec City, QC, Canada.
7. Huntsberry, M. E., Roma, P. G., Christensen, C. J., Ruggiero, A. M., & Suomi, S. J. (2007, June). Token exchange and the selective-value effect in capuchin monkeys (Cebus apella). Poster session presented at the annual meeting of the American Society of Primatologists, Winston-Salem, NC.
8. Roma, P. G., Chen, S. A., Barr, C. S., & Riley, A. L. (2007, June). Dissociation between physiological and motivational effects of alcohol in female Fischer & Lewis rats. Poster session presented at the annual meeting of the College on Problems of Drug Dependence, Quebec City, QC, Canada.
9. Riley, A. L., & Roma, P. G. (2006, August). Interactions of the aversive and rewarding properties of drugs: Implications for drug acceptability. Festschrift for Vincent M. LoLordo (Halifax, Nova Scotia, Canada).
10. Roma, P. G., Ruggiero, A. M., Schwandt, M. L., Higley, J. D., & Suomi, S. J. (2006, August). Does practice make perfect? Maternal behavioral interactions and stress reactivity in infants of primiparous and multiparous rhesus monkeys (Macaca mulatta). Poster session presented at the annual meeting of the American Society of Primatologists, San Antonio, TX.
11. Ruggiero, A. M., Roma, P. G., Schwandt, M. L., Higley, J. D., & Suomi, S. J. (2006, August). Behavioral interactions and stress reactivity in infants of differentially reared rhesus monkeys (Macaca mulatta). Poster session presented at the annual meeting of the American Society of Primatologists, San Antonio, TX.
12. Huntsberry, M. E., Ruggiero, A. M., Christensen, C. J., Roma, P. G., Silberberg, A., & Suomi, S. J. (2006, August). Operant conditioning fails to facilitate mirror self-recognition in capuchin monkeys (Cebus apella). Poster session presented at the annual meeting of the American Society of Primatologists, San Antonio, TX.
13. Roma, P. G., Davis, C. M., & Riley, A. L. (2006, June). Acquisition of drug-induced conditioned place preference in Fischer and Lewis rats. Poster session presented at the annual meeting of the College on Problems of Drug Dependence, Scottsdale, AZ.
Roma, P. G, & Riley, A. L. (2005, November). Assessment of the aversive and rewarding effects of ethanol in the Fischer and Lewis rat strains. Poster session presented at the annual meeting of the Society for Neuroscience, Washington, DC.
14. Davis, C. M., Roma, P. G., & Riley, A. L. (2005, August). Cross-fostering effects on the extinction of cocaine-induced taste aversions in the Fischer and Lewis rat strains. NIDA/NIAAA/APA (Divisions 28 & 50) Early Career Investigators Poster Session at the annual meeting of the American Psychological Association, Washington, DC.
15. Roma, P. G., & Riley, A. L. (2005, August). "Double-biased" place conditioning for assessing drug reward and aversion. NIDA/NIAAA/APA (Divisions 28 & 50) Early Career Investigators Poster Session at the annual meeting of the American Psychological Association, Washington, DC.
16. Ruggiero, A. M., Roma, P. G., Silberberg, A., & Suomi, S. J. (2005, August). Individual reward history, social comparison, and rejection of differentially valued goods in Capuchin monkeys (Cebus apella). Poster session presented at the annual meeting of the American Society of Primatologists, Portland, OR.
17. Davis, C. M., Roma, P. G., Keeler, M. A., & Riley, A. L. (2005, June). Genetic strain, maternal environment, and biological sex interact to affect cocaine-induced taste aversions in Fischer and Lewis rats. Poster session presented at the annual meeting of the College on Problems of Drug Dependence, Orlando, FL.
18. Roma, P. G., & Riley, A. L. (2005, June). Thinking outside the box: A case of apparatus bias resolution for place conditioning. Poster session presented at the annual meeting of the College on Problems of Drug Dependence, Orlando, FL.
19. Gura, T., Roma, P. G., Barr, C., Becker, M., Higley, S. B., Suomi, S. J., & Higley, J. D. (2003, August). HPA axis responses of rhesus monkey mothers during separations vary from their first to second infants. Poster session presented at the annual meeting of the American Society of Primatologists, Calgary, AB.
20. Shannon, C., Champoux, M., Roma, P. G., & Suomi, S. J. (2003, August). The effects of handling of surrogate-peer reared rhesus monkey (Macaca mulatta) infants on ACTH. Poster session presented at the annual meeting of the American Society of Primatologists, Calgary, AB.
21. Wojteczko, K., Graham, T., Roma, P., Lindell, S., Barr, C., Suomi, S., & Higley, J. D. (2003, August). The effects of stress, and the stability of individual differences in alcohol consumption. Poster session presented at the annual meeting of the American Society of Primatologists, Calgary, AB.
22. Roma, P., Champoux, M., Shannon, C., & Suomi, S. J. (2002, June). Possible stable effects of early prolonged controllability on responses to a novel environment in infant rhesus monkeys (Macaca mulatta). Poster session presented at the annual meeting of the American Society of Primatologists, Oklahoma City, OK.
23. Roma, P., Lowery, T., Champoux, M., & Suomi, S. J. (2002, June). A simple apparatus for simultaneously and unobtrusively collecting saliva samples from individually housed infant rhesus monkeys (Macaca mulatta). Poster session presented at the annual meeting of the American Society of Primatologists, Oklahoma City, OK.
24. Champoux, M., Hommer, R., Roma, P., Shannon, C., & Suomi, S. (2001, August). Controllability of the environment in surrogate-peer reared rhesus monkey infants. Poster session presented at the annual meeting of the American Society of Primatologists, Savanna, GA.
25. Hommer, R., Rio, D., Momenan, R., Roma, P., Champoux, M., Higley, S., Higley, J., Hommer, D., & Suomi, S. (2001, August). Sex differences in brain volume of infant rhesus macaques. Poster session presented at the annual meeting of the American Society of Primatologists, Savannah, GA.
26. Roma, P., & Renner, C. H. (2000, March). The development of computer literacy in college students. Paper presented at the annual meeting of the Eastern Psychological Association, Baltimore, MD.
27. Shaffer, L. S., Roma, P., Renner, C. H., & Mancill, B. (2000, March). Creation and validation of the recipe knowledge index. Poster session presented at the annual meeting of the Eastern Psychological Association, Baltimore, MD.