In midpontine pretrigeminal Cats single fiber activity from the afferent (geniculo-cortical) and efferent (cortico-fugal) visual cortical tracts was studied in terms of interval distribution of successive spikes under steady, diffuse light stimulations. It was found that both the proportions of fibers which significantly modify their temporal patterns of discharge and the proportions of illumination trials which bring about significant changes in the neuronal interval distributions are very similar in both the visual pathways. However, even a difference in reactivity has been shown between the two neuronal populations, namelyan earlier tendency to saturate under steady illumination for cortico-fugal activity. Present results are examined and discussed in relation to previous data collected in analogous experiments performed on cats under barbiturate anesthesia.
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Con il contributo del Ministero per i Beni e le Attività Culturali