Back in the early 90's when Computerized Polygraph systems came into practice, they had a powerful effect on examinees. "Oh no, there is no way we are going to get over on a computerized polygraph, we are toast!"

Fast forward 2 decades--now, even 9 years olds are downloading apps on their iphones and tablets, computers have become ubiquitous, and a laptop with a small DAS is unassuming and routine.

However, the analog instrument with the sounds of the pens whipping about and scratching away on the charts is something that appears scientific and intimidating to those who are accustomed to computers.

Most polygraph literature emphasizes the importance of stimulating the examinee--giving confidence to the innocent (psychological set focused on the control questions) while instilling fear into the guilty allowing them to be oriented to the relevants.

So the use of the analog instrument, in itself can stimulate the subject and enhance question discrimination.

Before rebutting this, I would challenge you to experiment and scrutinize the empirical results..