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Interestingly , during pursuit initiation , a weighted vector average of the speed and direction of both targets appears to describe the data better than does winner-take-all selection ( Lisberger and Ferrera , 1997 ) . You hit on one of the ways to shield yourself from MITM attacks , which is using a virtual private network ( VPN ) with mutual authentication . Whois service ( port 43 access available at whois.iana.org ) . The other variable would be in terms of different student reading levels and the axiom by one reading specialist ( name eludes me ) that the continuum striven for is " learning to read in order to read to learn . The next layer ( C2 ) is similar to the C1 cells : by pooling together signals from S2 cells of the same type but at slightly different positions ( and scales ) , the C2 units become more invariant to position ( and scale ) but preserve feature selectivity .