 Focal neurological deficits may be caused by a variety of medical conditions such as head trauma, tumors or stroke; or by various diseases such as meningitis or encephalitis or as a side effect of certain medications such as those used in anesthesia.Neurological soft signs, are a group of non-focal neurologic signs.Frontal lobe signs usually involve the motor system and may include many special types of deficit, depending on which part of the frontal lobe is affected