Geller's performances of drawing duplication and cutlery bending usually take place under informal conditions such as television interviews. During his early career, he allowed some scientists to investigate his claims. A study was commissioned by the United States Defense Intelligence Agency as part of the Stargate Project and conducted during August 1973 at Stanford Research Institute (now known as SRI International) by parapsychologists Harold E. Puthoff and Russell Targ. Geller was isolated and asked to reproduce simple drawings prepared in another room. The experimenters concluded that Geller had "demonstrated his paranormal perceptual ability in a convincing and unambiguous manner". Writing about the same study in a 1974 article published in the journal "Nature", they concluded that he had performed successfully enough to warrant further serious study, coining the term "Geller effect" to refer to the particular type of abilities they felt had been demonstrated.