(2111) Placebo effects on human {micro}-opioid activity during pain.   Wager TD, Scott DJ and Zubieta JK.   2007.   Proceedings of the National Academy of Sciences of the United States of America, volume 104, pages 11056-11061.

(2112) Irradiation as an experimental tool in studies of adult neurogenesis.   Wojtowicz JM.   2006.   Hippocampus, volume 16, pages 261-266.

(2113) Helpers benefit offspring in both the short and long-term in the cooperatively breeding banded mongoose.   Hodge SJ.   2005.   Proceedings. Biological Sciences / The Royal Society, volume 272, pages 2479-2484.   This study did not demonstrate that helpers gained fitness benefits from rearing the offspring of others, so that the conclusion that they may have done so is speculative, and is an insufficient basis for a critique of the work of others.

(2114) Investment strategies of breeders in avian cooperative breeding systems.   Hatchwell BJ.   1999.   The American Naturalist, volume 154, pages 205-219.

(2115) Contributions of the face and body to overall attractiveness.   Peters M, Rhodes G and Simmons LW.   2007.   Animal Behaviour, volume 73, pages 937-942.

(2116) Visual language discrimination in infancy.   Weikum WM, Vouloumanos A, Navarra J, Soto-Faraco S, Sebastián-Gallés N and Werker JF.   2007.   Science, volume 316, page 1159.   Intimation of responses to the infants by their carers or by the researchers was not seen to be addressed in the design of this study. The younger the infant, the more involvement of the carer, hence the statistically significant results for younger infants.

(2117) Symbolic arithmetic knowledge without instruction.   Gilmore CK, McCarthy SE and Spelke ES.   2007.   Nature, volume 447, pages 589-591.   Intimation between the children and the researchers was not seen to be addressed in the design of this study.

(2118) A comparison of the auditory images of musicians, psychologists and children.   Agnew M,   1922.   University of Iowa Studies in Psychology, number VIII, pages 268-278.   In Psychological Review Monographs, 1922, volume XXXI.

(2119) Focal stimulation of the posterior parietal cortex increases the excitability of the ipsilateral motor cortex.   Koch G, Fernandez Del Olmo M, Cheeran B, Ruge D, Schippling S, Caltagirone C and Rothwell JC.   2007.   Journal of Neuroscience, volume 27, pages 6815-6822.

(2120) Humans trade off viewing time and movement duration to improve visuomotor accuracy in a fast reaching task.   Battaglia PW and Schrater PR.   2007.   Journal of Neuroscience, volume 27, pages 6984-6994.