  Counseling is usually conducted through spoken conversation between a
therapist and a client. The empathy level of therapist is a key indicator of
outcomes. Presuming that therapist's empathy expression is shaped by their past
behavior and their perception of the client's behavior, we propose a model to
estimate the therapist empathy by considering both intrapersonal and
interpersonal influences. These dynamic influences are captured by applying an
attention mechanism to the therapist turn and the historical turns of both
therapist and client. Our findings suggest that the integration of dynamic
influences enhances empathy level estimation. The influence-derived embedding
should constitute a minor portion in the target turn representation for optimal
empathy estimation. The client's turns (interpersonal influence) appear to
slightly surpass the therapist's own turns (intrapersonal influence) in empathy
estimation effectiveness. It is noted that concentrating exclusively on recent
historical turns can significantly impact the estimation of therapist empathy.
