Catherine Wolf, an experimental psychologist whose research focused on enhancing interactions between humans and computers - and who, after illness left her paralyzed, relied on her laptop to communicate, using a system that let her wiggle an eyebrow to pick out letters - died on Feb. 7 at her home in Katonah, N.Y. She was 70. Dr. Wolf's work at IBM's Thomas J. Watson Research Center in Westchester County, N.Y., helped programmers develop voice-recognition systems that, for example, let users compose text by speaking to a computer and banking customers make transactions by telephone.