Speech therapist Nancy Gervais comforts Alrhey Margarejo, 4, at Children's Choice for Hearing and Talking as a technician at right works on the appartus thath helps Alrhey hear. while another staff member replaces a battery in his cochlear implant. The institution, also known as CCHAT, is leading school in teaching deaf and hard of hearing children to listen and develop spoken language - sometimes a controversial topic.