The shift in depth is not usually instantaneous, particularly if the pattern is fairly narrow. This explanation fails to capture one aspect of the illusion. We speculate that access to the most sensitive V1 neurons depends on the extrastriate processes that determine perceived depth-in this case, second-order envelope mechanisms.ĭiagram of wallpaper illusion demonstrating the new matching solution produced by convergence on a point in front of a repetitive pattern-in this example, a sinusoidal grating segment. However, once the perceived shift in depth occurred, stereoacuity improved fivefold without any change in the physical stimulus. We also found that stereoacuity for the initial envelope-based match was poor, as might be expected for a target presented far off the fixation plane. Our measurements for a range of spatial frequencies and disparities showed that these shifts to the fixation plane occurred only if the envelope disparity was more than one-half period of the carrier that is, phase disparity >180°. Additional experiments demonstrated that the envelope was adapting, thereby permitting the alternative match. Initially, the shift from the edge plane took 4–6 s, but after many trials, the shift became faster. We asked observers to signal when the segment appeared to move from the edge plane forward to the fixation plane. We measured the timing of this shift for a 6° wide, 3-cpd sinusoidal grating presented in a rectangular envelope the edges (envelope) of the grating were presented at 20 arcmin of disparity (one period) behind the fixation plane. So what else?' We can sneak around these lanes and the back streets.In the wallpaper illusion, a repetitive pattern appears to shift from one depth plane to the plane nearest fixation. Bond hated disguises never felt happy wearing them found it difficult to take on some new role.He made a lame protest, saying he wasn't going to wear fancy dress, not for anybody. Bond sounded irritable.Why this farm track, Jack?Īnd that's the good news.The bad news is that the train stations and airports are crawling with the secret squirrels.You're both gonna need new passports, and I fear we're forced to use some old-fashioned remedy, like disguise. Wade's voice was languid, as though it did not matter one way or the other to him. This ain't gonna be the easiest job in the world. He suddenly swung the car across the road, hanging a right into narrow country lane. On the other hand it ain't gonna be impossible. Whatever.Anyways, the outskirts are crawling with people looking to do dangerous things to you.I did a quick checkup, and for some reason they don't seem to know where you've been staying, James.Ībout half an hour later, Wade turned up, still in the battered old Moscovich, flashing a radiant smile.In the car, heading back to the hotel, Bond gave him a shopping list which included tickets on the first available plane to the United States, a valid passport with the right visas for Natalya, and some changes of clothes for the girl.Īfter a pause, Bond asked if he understood Wade correctly.What you're saying is that nobody's got the hotel under surveillance? The Police and Security Organs are looking for a man and a woman. KGB doesn't exist any more,' Natalya bridled. Petersburg there doesn't seem to be a general alert.These people're funny.I guess they figure that nobody would be stupid enough to come right into town. Some fools have been tampering with weapons and railway equipment. Clean as the proverbial whistle.No pack drill, no names, James.ĭon't worry, James.We'll be subtle.We won't put you in drag.īecause of the road blocks and their other games, James.
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