| Summary: | The relaxed posture of the eyelids keeps the eyes closed, the eyes open is part of the active behavior in living organisms, the activity gives rise to the blinking eye, that for the majority goes unnoticed. You can classify several types of eyeblink, blinking is a response that participates in the facial expression of the emotions. The muscle of the eyelid is essentially involved in emotional responses, as shown during the surprise, fear, or startle. We have studied the eyeblinking linked to aversive events of short duration. We need to know what is happening with the blinking eye to aversive stimuli with longer duration. The forced swimming test (PNF), stimulation provides a sharp, intense and prolonged by 15 minutes. Then we assess the response of eye blinking under the effect of the aversive stimulation provided by the PNF. We used 10 type Wistar male rats experimentally naive, with a weight next to the 300 g were housed with boxes-individual room and free access to food and water. The response of blinking eye was defined as: the behavior of closing and opening in a short period that the eyelids cover the eyes of the rat. We used a modified procedure of the PNF in establishing as a criterion of time 15 minutes for each of the two trials. The first assay began to put the rat in the cylinder with water. The second assay was performed 24 hours after the first assay. The sessions were videotaped, of which the recordings were obtained. The graph shows us a process of change in the blinkin eye, this suggests to us that this is a eyeblinking emotional, which passes through: the surprise; anxiety; and something like depression. It is a complex of processes in which they are involved a variety of mechanisms. We compare our results with other researches of blinking. The descriptors process involved in the anxiety-depression, are at different levels and can go from its link with physiological states until the mechanisms at the biochemical level responsible for that behavior.
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