1. How should we speak: comparing effectiveness of promotive and prohibitive voices Open Access Author: Cheung, Ho Kwan Title: How should we speak: comparing effectiveness of promotive and prohibitive voices Area of Honors: Psychology Keywords: voicepromotive voiceprohibitive voiceperformance ratingsidea endorsementlikingextra-role behavior File: Download Undergraduate_Thesis-_Outcomes_of_Voice_Behavior-_Ho_Kwan_Cheung.pdf Thesis Supervisors: Dr. Songqi Liu, Thesis SupervisorRick R Jacobs, Thesis Honors Advisor