CHICAGO -- Minority students are more likely than whites to study with, dine with and date students from different racial and ethnic groups, according to a nationwide study to be released tomorrow.

However, students of color are much more likely than whites to feel excluded from school activities because of their racial or ethnic identity. And they are more likely to report racially based insults or threats made by faculty or fellow students, according to the study conducted by researchers from the Universities of Michigan and Arizona.

Critics of multiculturalism and diversity on college campuses have complained that programs such as ethnic and racial student organizations, minority dorms and houses and student cultural centers segregate minorities on campus.

"When people talk about Balkanization on campus, they talk only about minority students," said Sylvia Hurtado, an assistant professor of education at the University of Michigan, who co-wrote the study with Jesus Trevino of the University of Arizona and Eric L. Dey of Michigan. The study was based on a national sample of 6,000 college students at 390 schools.