Atropine sulfate (0.03 mg/kg, s.c.) was administered to reduce alimentary secretions, and dexamethasone (1 mg/kg, i.v.) and cephazolin (30 mg/kg, i.v.) were readministered. The cat was intubated, placed in a stereotaxic apparatus and prepared for sterile and aseptic surgery. The hair was clipped and a depilatory cream was used to eliminate hair from the site. The site was cleaned with alcohol and with a betadine scrub, and the dorsum of the head draped. A skin incision was made along

the midline, the temporalis and occipitalis muscles reflected, and a craniotomy made over the occipitoparietal and temporal neocortices. A durectomy revealed the brain, and mannitol (1.5 gm/kg/min; 25% solution) was intravenously infused to harden the brain. All contiguous visual cortical areas were removed by subpial aspiration, as previously described (Rushmore

et al., 2006). 5-FU chemical structure An acrylic plug was placed in the bone over the contralesional posterior cortex for later localisation of the stimulation site. Throughout the procedures heart and respiratory rates were monitored check details along with core body temperature, respiratory waveform shape, expired carbon dioxide concentration, and pedal reflexes. A change in any of these measures was countered by supplementary administration of sodium pentobarbital. Dura and bone were replaced, and the muscle and skin sutured in place. Postsurgical recovery was closely monitored, especially respiratory rate, reflex tone, heart rate and body temperature. Postoperative fluids (50–100 mL of Ringer’s solution, s.c.) were injected in addition to antibiotics (30 mg/kg cefazolin every 8–12 h for 7 days, i.m.) and an analgesic (0.01 mg/kg of buprenorphine, s.c.). Once conscious, animals were given soft food and water and closely monitored by research and veterinary staff over the next 3 days. Analgesics were administered for an additional

2 days, and discontinuation was made in consultation with attending veterinarians. Additional doses of dexamethasone were tapered over a 7- to 10-day period. Sutures were removed 2 weeks following surgery at which time cats returned to group housing. Recovery was uneventful in all cases. Animals were acclimated to sit quietly in a nylon veterinary cat bag, and periodically rewarded. Stimulation was performed SPTBN5 as previously described (Fig. 1; Schweid et al., 2008). The transcranial direct current stimulation (tDCS) machine (ActivaDose; ActivaTek, Inc., Salt Lake City, UT, USA) was connected to two 2 × 2 cm electrodes (Uni-Tab Electrodes; Balego and Associates, Inc. Wabasha, MN, USA). Hair over the electrode sites was cut regularly to minimise electrical resistance. The anode was placed on the ipsilesional supraorbital location of the scalp and the cathode was positioned over the contralesional parietal cortex such that the center of the electrode was placed over the palpable surgically-placed acrylic plug.