Three expressions of the need for variety1


  • 1

    This research was supported in whole by Public Health Service Research Grant No MH-06652-01, from the National Institute of Mental Health The authors wish to express their gratitude to Pamela Pearson, Susan Andrews, and Naomi Berne for their assistance in data analysis, and to Leonard Unterberger, Marvin Frankel, and Adrienne J Smith for their assistance in data collection