Figure 1.
(A) Schematic illustration of stimulation with bilateral cochlear implants. Stimulus: 3 biphasic charge-balanced pulses delivered to each ear at 6 dB above eABR threshold, 200 µs/phase, 500 Hz repetition rate. Recording in the primary auditory cortex, field A1 (yellow area). The terms “crossed” and “uncrossed” indicate the side of stimulated cochlea with respect to the recorded cortical hemisphere: crossed = stimulated cochlea contralateral to the recording side (dark arrow), uncrossed = stimulated cochlea and recorded cortex at the same side (light arrow). (B) Scheme illustrating the recording conditions in animals with unilateral congenital deafness (uCDCx), corresponding to the condition of SSD. Responses collected from the hemisphere of the same side as the hearing ear (ipsilateral) are designated uCDCi (red arrow); those contralateral to the hearing ear are designated uCDCc (blue arrow). (C) Animals investigated in the present study: HC: acutely deafened hearing controls; CDC: bilaterally congenitally deaf cats; uCDCi, uCDCc: unilaterally congenitally deaf cats recorded ipsilateral or contralateral to the hearing ear.