Bekkedal, M. Y. V., Rossi III, J. & Panksepp, J. (1999). Fetal and neonatal exposure to trimethylolpropane phasphate alters rat social behavior and emotional responsivity. Neurotoxicology & Teratology, 21, 435-443.

Bingman, V.P., Able, K.P. & Siegel, J.J. 
(1999). Hippocampal lesions do not impair the geomagnetic orientation of migratory Savannah sparrows. Journal of Comparative Physiology A., 185, 577-581.

Budzynski, C.A. & Bingman, V.P. (1999). Time-of-day discriminative learning in homing pigeons, Columba livia. Animal Learning and Behavior, 27, 295-302.

Connolly, M.S., Williams, N., Heckman, C.A., & Morris, P.F. (1999). Soybean isoflavones trigger a calcium influx in Phytophthora sojae. Fungal Genetics and Biology, 28, 6-11.

Gagliardo, A., Ioalé, P. & Bingman, V.P.
(1999). Homing in pigeons: The role of the hippocampal formation in the representation of landmarks used for navigation. Journal of Neuroscience, 19, 311-315.

Ikemoto, S. & Panksepp, J. (1999). The role of nucleus accumbens dopamine in motivated behavior: A unifying interpretation with special reference to reward-seeking. Brain Research Reviews, 31, 6-41.

Iribe, Y., Moore, K., Pang, K.C.H. & Tepper, J.M. (1999). Subthalamic stimulation-induced synaptic responses in nigral dopaminergic neurons in vitro, Journal of Neurophysiology, 82, 925-933.

Keller, T.A., & Moore, P.A. (1999). Effects of ontogeny and predator odors on prey behavior. Mar. Fresh. Behav. Physiol., 33, 35-50.

Knutson, B., Burgdorf, J. & Panksepp, J. (1999). High frequency ultrasonic vocalizations index conditioned pharmacological reward in rats. Physiology & Behavior, 66, 639-643.

Moore, P.A., & Grills, J. (1999). Chemical orientation to food by the crayfish, Orconectes rusticus: Influence by hydrodynamics. Animal Behavior, 58, 953-963.

Moore, P.A., Fields, D.M., & Yen, J. (1999). Physical constraints of chemoreception in foraging copepods. Limnol. & Oceanogr., 44, 166-177.

Pang, K.C.H. & Nocera, R. (1999). Interactions between 192-IgG saporin and intraseptal cholinergic and GABAergic drugs: evidence for a role of cholinergic medial septal neurons in spatial working memory, Behavioral Neuroscience, 113, 265-275.

Panksepp, J. (1999). Emotions as viewed by psychoanalysis and neuroscience: An exercise in consilience, and accompanying commetaries. NeuroPsychoanalysis, 1, 15-89.

Panksepp, J. (1999). Neural Systems: From Animals to Humans. Encyclopedia of Emotions, Vol. 2. D. Levinson, J.J. Ponzetti, Jr., & P.F. Jorgensen (eds.), 475-478. New York: MacMillan.

Panksepp, J. & Burgdorf, J. (1999). Laughing rats? Playful tickling arouses high frequency ultrasonic chirping in young rodents. In S. Hameroff, D. Chalmers & A. Kazniak, Toward a science of consciousness III, 231-244, Cambridge, Mass.: MIT Press.

Provost, T.L., Juárez de Ku, L.M., Zender, C. & Meserve, L.A. (1999). Dose- and age-dependent alterations in coline acetyltransferase (ChAT) activity, learning and memory, and thyroid hormones in 15- and 30-day-old rats exposed to 1.25 or 12.5 ppm polychlorinated biphenyl (PCB) beginning at conception. Progress in Neuro- Psychopharmacology & Biological Psychiatry, 23, 915-928.

Pruitt, D.L., Meserve, L.A., & Bingman, V.P. (1999). Reduced growth of intra- and infra-pyramidal mossy fibers is produced by continuous exposure to polychlorinated biphenyl. Toxicology, 138, 11-17.

Riters, L.V. & Bingman, V.P. (1999). The effects of lesions to the caudolateral neostriatum on sun compass based spatial learning in homing pigeons. Behavioural Brain Research, 98, 1-15.

Riters, L.V., Erichsen, J., Krebs, J. & Bingman, V.P. (1999). Neurochemical evidence for at least two regional subdivisions within the homing pigeon (Columba livia) caudolateral neostriatum. Journal of Comparative Neurology, 412, 469-487.

Shafir, S., Wiegmann, D.D., Smith, B.H. & Real, L.A. (1999). Risk-sensitive foraging: choice behavior of honey bees in response to variability in volume of reward. Anim. Behav., 57, 1055-1061.

Strasser, R. & Bingman, V.P. (1999). The effects of hippocampal lesions in homing pigeons on a one-trial food association task. Journal of Comparative Physiology A., 185, 583-590.

Turner, C., Panksepp, J., Bekkedal, M., Borkowski, C. & Burgdorf, J. (1999). Paradoxical effects of serotonin and opioids in pemoline-induced self-injurious behavior. Pharmacology, Biochemistry and Behavior, 63, 361-366.

Wiegmann, D. D. (1999). Search behavior and mate choice by female field crickets, Gryllus integer. Anim. Behav., 58, 1293-1298.

Wiegmann, D. D., Mukhopadhyay, K., & Real, L.A. (1999). Sequential search and the influence of male quality on female mating decisions. J. Math. Biol., 39, 193-216.

Zaborszky, L., Pang, K., Somogyi, J., Nadasdy, Z. & Kallo, I. (1999). The basal forebrain corticopetal system revisited. Annals of the New York Academy of Science, 877, 339-367.

Schneider, Z.R., Schneider, R.W.S., & Moore, P.A. (1999). Recognition of dominance status by chemoreception in the crayfish, Procambarus clarkii. J. Chemical Ecology, 25, 781-794.