Reinstatement of short-latency responses after asymptotic Pavlovian conditioning training by the presentation of an extraneous stimulus

The purpose of this study was to examine whether the progressive disappearance of short-latency conditioned responses, or inhibition of delay, observed in Pavlovian conditioning with long inter-stimulus intervals, could be reverted by the presentation of a novel stimulus. In one experiment, two groups of rabbits received extensive training with a short (250 ms) or a long (1500 ms) tone that overlapped and terminated with a periorbital shock unconditioned stimulus. After training, the presentation of an extraneous stimulus prior to tone onset produced a reinstatement of short latency CRs in the group trained with the long CS, but did not affect CR latency in the group trained with the short CS. This finding is consistent with Pavlov's (1927) view that conditioning with long conditioned stimuli involves the acquisition of response tendencies in the early portion of the stimulus that are subsequently suppressed by the development of an inhibitory process.

Reconstrucción funcional del párpado inferior / Functional reconstruction of lower eyelid

Este trabajo presenta una nueva técnica, descrita por Hinderer, mediante la cual recuperamos la función palpebral inferior. Nuestras exigencias, abarcan 13 pacientes, en todos ellos llenamos las espectativas que nos propusimos. Consideramos que la función del párpado inferior, no solo es de importancia para la visión, sino tambien cumple un papel estético en la expresión humana de ahí que desde hace muchos años atrás, su estudio fue encausado por numerosos autores.