stimuli, levels, stimulus, stimulation, level, responses, intensity, intensities, tests, concentrations, measures, testing, test, response, function, pulses, perception, pulse, conditions, sensitivity, depolarization, contrast, pain, activity, perimetry, values, current, functions, excitation, performance, ability, gratings, differences, signals, range, potential, activation, vision, strategies, concentration, target, data, doses, techniques, input, hearing, contrasts, dose, screening, measurements, tasks, tone, detection, strength, inputs, targets, strategy, phenomena, currents, sensations, examination, magnitude, presentations, solutions, voxels, summation, shocks, audiometry, sounds, judgments, scaling, processing, signal, sensation, tolerances, regime, shock, discrimination, appearance, depolarizations, patterns, grating, visibility, task, flashes, stimulations, experiments, procedures, domain