Thompson (1980) first detected and described the Thatcher Illusion, where participants instantly perceive an upright face with inverted eyes and mouth as grotesque, but fail to do so when the same face is inverted. One prominent but controversial explanation is that the processing of configural information is disrupted in inverted faces. Studies investigating the Thatcher Illusion either used f...

2 Surface magnetic anomalies in the Famous area define a typical zebra pattern related to sea floor spreading. This pattern is symmetrical and corresponds to a 1.1 cmlyr half spreading rate up to anomaly 3 ' . The axis of the central block is off-set from the topographic axis of the rift and indicates either asymmetric spreading in the central zone or a ridge axis jump. These two hypotheses are...

Here we introduce a simple elementary method due to myself. Let n be nk(p) or nk(p) − 1 according to whether −1 is a kth power residue mod p. Note that −n is a kth power nonresidue mod p. For i = 1, · · · , nk(p) − 1, clearly p − in is a kth power nonresidue mod p; if p − in > 0 then we must have p− in > nk(p) > n and hence p− (i+ 1)n > 0 since p is a prime. As p− n > 0, by the above p− nk(p)n ...