The model developed by Usui and Hirata was used to simulate the pupil response to a light stimulus based on autonomic nervous activity, such as sympathetic and parasympathetic activity. This model was recreated in SIMULINK finding that it did not consider the limitations of the pupil in frequency which Stark was reported. The pupil acts as a lowpass filter with a cut-off frequency of 1.5 Hz approximately. These conditions are generated by the unidirectional rate sensitivities. Then, considering this fact, the original model by placing the output of the lowpass filter of -20 dB/decade was modified, which there certain changes are regarding the response of the model by filtering high frequencies, and a delay by the filter.To obtain the pupil dynamic response induced by sound stimulation, the hippus and flickering of practice mode was using conventional (NTSC) and high speed videoculography thus, to determine sympathetic and parasympathetic activity, in order to recreate such behaviour the Hirata-Usui model was used with a few modification.

There have been new developments in prosthetic technology over the past 30 years, and the union of bionics and prosthetics has improved mobility and aesthetics, however, a person who lacks a limb will have to continue without a valuable sense, touch. As a result of stimulation of the receptors under the skin and subcutaneous tissue, touch is sensitive to mechanical stimuli and stimuli that produce heat, cold, and pain. In this chapter, the results presented include the stages of design, construction, and characterization of an ear prosthesis manufactured with a 3D printer in polyvinylidene fluoride (PVDF), which is a biocompatible and ferroelectric smart material (exhibits piezoelectric and pyroelectric properties). Thus, the behavior of the prosthesis in response to external stimuli such as pressure, heat, cold, acoustic waves, and light is presented, thereby, extending the purpose of a prosthesis to the area of sensory perception.