In the context of the reserach it's helpful to know they were all psychoanalysts. They focus on the human needs we acheive through work that are overlooked from the functional or material needs/outcomes of work.
In a modern context attend means would be more in line with EQ. Being about to sense, contain or facilitate someone scratching the itch of a need. It could be simply to help clarify, to hear, to reassure, to encourage, etc. All situationally specific based on the individuals in the group.
It would be interesting to learn how that capacity was observed and measured. Has anyone seen the source research?