data characteristic psi ref name hyman ray hyman ''evaluating parapsychological claims'' robert j sternberg henry l roediger diane f halpern ''critical thinking psychology'' cambridge university press pp ref ref name alcock parapsychology realm objective inquiry phenomena negatively defined defined terms ruling normal explanations course ruling normal explanations easy task may aware possible normal explanations may deceived subjects may deceive normal explanations actually could ruled
Social science Psychology Parapsychology