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Sensory leakage

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688:"The explanation used by Marks and Kammann clearly involves the use of Occam's razor. Marks and Kammann argued that the 'cues' - clues to the order in which sites had been visited - provided sufficient information for the results, without any recourse to extrasensory perception. Indeed Marks himself was able to achieve 100 per cent accuracy in allocating some transcripts to sites without visiting any of the sites himself, purely on the ground basis of the cues. From Occam's razor, it follows that if a straightforward natural explanation exists, there is no need for the spectacular paranormal explanation: Targ and Puthoff's claims are not justified." 209:
crept up to 28%. For those that occurred three times it was 38%, and for those targets that occurred six or more times, the hit rate was 52%. Each time a videotape is played its quality can degrade. It is plausible then, that when a frequently used clip is the target for a given session, it may be physically distinguishable from the other three decoy clips that are presented to the subject for judging. Surprisingly, the parapsychological community has not taken this finding seriously. They still include the autoganzfeld series in their meta-analyses and treat it as convincing evidence for the reality of psi.
239:'s remote viewing experiments. In a series of thirty-five studies, they were unable to replicate the results so investigated the procedure of the original experiments. Marks and Kammann discovered that the notes given to the judges in Targ and Puthoff's experiments contained clues as to which order they were carried out, such as referring to yesterday's two targets, or they had the date of the session written at the top of the page. They concluded that these clues were the reason for the experiment's high hit rates. According to 39: 1337: 280:
contained sensory cues. Marks and Christopher Scott (1986) wrote "considering the importance for the remote viewing hypothesis of adequate cue removal, Tart's failure to perform this basic task seems beyond comprehension. As previously concluded, remote viewing has not been demonstrated in the experiments conducted by Puthoff and Targ, only the repeated failure of the investigators to remove sensory cues."
133:, with subjects 'willing' them to fall a certain way. Not only can dice be drilled, shaved, falsely numbered and manipulated, but even straight dice often show bias in the long run. Casinos for this reason retire dice often, but at Duke, subjects continued to try for the same effect on the same dice over long experimental runs. Not surprisingly, PK appeared at Duke and nowhere else. 1349: 412:. "Today, researchers discount the first decade of Rhine's work with Zener cards. Stimulus leakage or cheating could account for all his findings. Slight indentations on the backs of cards revealed the symbols embossed on card faces. Subjects could see and hear the experimenter, and note subtle but revealing facial expressions or changes in breathing." 197:, randomization and security as well as possibilities of sensory leakage. Over half of the studies failed to safeguard against sensory leakage and all of the studies contained at least one of the 12 flaws. Because of the flaws, Honorton agreed with Hyman the 42 Ganzfeld studies could not support the claim for the existence of psi. 248:
data for independent examination when asked, but Targ and Puthoff consistently refused to allow Marks and Kammann to see copies of the transcripts. Marks and Kammann were, however, able to obtain copies of the transcripts from the judge who used them. The transcripts were found to contain a wealth of cues.
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The methods the Rhines used to prevent subjects from gaining hints and clues as to the design on the cards were far from adequate. In many experiments, the cards were displayed face up, but hidden behind a small wooden shield. Several ways of obtaining information about the design on the card remain
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had methodological problems that were well documented. Honorton reported only 36% of the studies used duplicate target sets of pictures to avoid handling cues. Hyman discovered flaws in all of the 42 Ganzfeld experiments and to assess each experiment, he devised a set of 12 categories of flaws. Six
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has written controlled tests by several other researchers, eliminating several sources of cuing and extraneous evidence present in the original tests, produced negative results. Students were also able to solve Puthoff and Targ's locations from the clues that had inadvertently been included in the
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Examination of the few actual transcripts published by Targ and Puthoff show that just such clues were present. To find out if the unpublished transcripts contained cues, Marks and Kammann wrote to Targ and Puthoff requesting copies. It is almost unheard of for a scientist to refuse to provide his
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whilst Sarah Owenby claimed to receive transmissions 250 miles away. For the experiment, Turner would think of a symbol and write it down whilst Owenby would write her guesses. The scores were highly successful and both records were supposed to be sent to J. B. Rhine, however, Owenby sent them to
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was performed by Lucien Warner and Mildred Raible. The subject was locked in a room with a switch controlling a signal light elsewhere, which he could signal to guess the card. Ten runs with ESP packs of cards were used and he achieved 93 hits (43 more than chance). Weaknesses with the experiment
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The most suspicious pattern was the fact that the hit rate for a given target increased with the frequency of occurrence of that target in the experiment. The hit rate for the targets that occurred only once was right at the chance expectation of 25%. For targets that appeared twice the hit rate
468:. "Despite Rhine's confidence that he had established the reality of extrasensory perception, he had not done so. Methodological problems with his experiments eventually came to light, and as a result parapsychologists no longer run card-guessing studies and rarely even refer to Rhine's work." 259:
Most of the material in the transcripts consists of the honest attempts by the percipients to describe their impressions. However, the transcripts also contained considerable extraneous material that could aid a judge in matching them to the correct targets. In particular, there were numerous
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claimed that a rejudging of the transcripts from one of Targ and Puthoff's experiments revealed an above-chance result. Targ and Puthoff again refused to provide copies of the transcripts and it was not until July 1985 that they were made available for study when it was discovered they still
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references to dates, times and sites previously visited that would enable the judge to place the transcripts in proper sequence... Astonishingly, the judges in the Targ-Puthoff experiments were given a list of target sites in the exact order in which they were used in the tests!
103:. His experiments were discredited due to the discovery that sensory leakage or cheating could account for all his results such as the subject being able to read the symbols from the back of the cards and being able to see and hear the experimenter to note subtle clues. 200:
Possibilities of sensory leakage in the Ganzfeld experiments included the receivers hearing what was going on in the sender's room next door as the rooms were not soundproof and the sender's fingerprints to be visible on the target object for the receiver to see.
64:(1989) and Andrew Neher (2011) have studied the history of psi experiments from the late 19th century up until the 1980s. In every experiment investigated, flaws and weaknesses were discovered so the possibility of naturalistic explanations (such as 112:
even in the presence of the shield. For instance, the subject may be able sometimes to see the design on the face-up card reflected in the agent's glasses. Even if the agent isn't wearing glasses it is possible to see the reflection in his cornea.
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Once Rhine took precautions in response to criticisms of his methods, he was unable to find any high-scoring subjects. Due to the methodological problems, parapsychologists no longer utilize card-guessing studies. Rhine's experiments into
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were later discovered. The duration of the light signal could be varied so that the subject could call for specific symbols and certain symbols in the experiment came up far more often than others which indicated either poor shuffling or
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Turner. Critics pointed out this invalidated the results as she could have simply written her own record to agree with the other. When the experiment was repeated and the records were sent to Rhine the scores dropped to average.
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According to Marks, when the cues were eliminated the results fell to a chance level. Marks was able to achieve 100 per cent accuracy without visiting any of the sites himself but by using cues.
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Marks and Kamman concluded: "Until remote viewing can be confirmed in conditions which prevent sensory cueing the conclusions of Targ and Puthoff remain an unsubstantiated hypothesis."
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Hyman also reviewed the auto-Ganzfeld experiments and discovered a pattern in the data that implied a visual cue may have taken place:
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Hyman wrote the auto-Ganzfeld experiments were flawed because they did not preclude the possibility of sensory leakage.
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is a term used to refer to information that transferred to a person by conventional means (other than
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of these concerned statistical defects, the other six covered procedural flaws such as inadequate
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For example, where the subject in an ESP experiment receives a visual cue—the reflection of a
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experiment was discovered to contain flaws. Frances May Turner positioned herself in the
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Pseudoscience and Extraordinary Claims of the Paranormal: A Critical Thinker's Toolkit
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Assessing possible sender-to-experimenter acoustic leakage in the PRL autoganzfeld
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experiments confessed to fraud, the Brugmans' experiment, the experiments by
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An Encyclopedia of Claims, Frauds, and Hoaxes of the Occult and Supernatural
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How We Know What Isn't So: The Fallibility of Human Reason in Everyday Life
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The establishment of data manipulation in the Soal-Shackleton experiments
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experiments were proven to be fraudulent, one of the subjects from the
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in the holder's glasses—sensory leakage can be said to have occurred.
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in Robert J. Sternberg, Henry L. Roediger, Diane F. Halpern. (2007).
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Paranormal and Transcendental Experience: A Psychological Examination
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The New Apocrypha: A Guide to Strange Sciences and Occult Beliefs
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The Elusive Quarry: A Scientific Appraisal of Psychical Research
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did not rule out the possibility of sensory cues or trickery.
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Association for the Scientific Study of Anomalous Phenomena
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Back from the Future: Parapsychology and the Bem Affair
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Information Transmission in Remote Viewing Experiments
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Information transmission in remote viewing experiments
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Beyond Belief: Skepticism, Science and the Paranormal
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Princeton Engineering Anomalies Research Laboratory
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Nature 292: 177. 465:Skeptical Inquirer 227:The psychologists 182: 129:His research used 44: 1363: 1362: 981:Psychic detective 941:Pam Reynolds case 846:Astral projection 317:Donovan Rawcliffe 156:card manipulation 54:Donovan Rawcliffe 1388: 1351: 1350: 1339: 1338: 1280:Life Before Life 1245:Irreducible Mind 811: 804: 797: 788: 781: 771: 765: 755: 749: 731: 725: 715: 709: 695: 689: 674: 668: 649: 643: 633: 627: 617: 611: 601: 595: 585: 579: 565: 559: 549: 543: 522: 509: 498: 492: 482: 469: 451: 445: 435: 429: 419: 413: 396: 390: 383: 377: 364:Betty Markwick. 362: 356: 346: 340: 330: 324: 314: 308: 301:"Sensory Leakage 294: 190:Charles Honorton 1396: 1395: 1391: 1390: 1389: 1387: 1386: 1385: 1366: 1365: 1364: 1359: 1327: 1273:Life After Life 1218: 1197: 1136: 1065: 1026:Sensory leakage 991:Psychic surgery 986:Psychic reading 916:Materialization 876:Dream telepathy 829: 820: 815: 785: 784: 772: 768: 756: 752: 732: 728: 718:C. E. M. Hansel 716: 712: 696: 692: 675: 671: 650: 646: 636:Thomas Gilovich 634: 630: 618: 614: 602: 598: 586: 582: 566: 562: 552:Richard Wiseman 550: 546: 523: 512: 502:Richard Wiseman 499: 495: 483: 472: 452: 448: 436: 432: 420: 416: 397: 393: 384: 380: 363: 359: 347: 343: 333:C. E. M. Hansel 331: 327: 315: 311: 295: 291: 286: 253:Thomas Gilovich 225: 219: 170: 164: 151:Duke University 78:Smith-Blackburn 58:C. E. M. Hansel 50: 36: 17:Sensory leakage 12: 11: 5: 1394: 1392: 1384: 1383: 1381:Parapsychology 1378: 1368: 1367: 1361: 1360: 1358: 1357: 1345: 1332: 1329: 1328: 1326: 1325: 1318: 1311: 1304: 1297: 1290: 1283: 1276: 1269: 1262: 1255: 1248: 1241: 1234: 1226: 1224: 1220: 1219: 1217: 1216: 1211: 1205: 1203: 1199: 1198: 1196: 1195: 1190: 1185: 1180: 1175: 1170: 1165: 1160: 1155: 1150: 1144: 1142: 1138: 1137: 1135: 1134: 1132:The Ghost Club 1129: 1124: 1119: 1114: 1109: 1104: 1099: 1094: 1089: 1084: 1079: 1073: 1071: 1067: 1066: 1064: 1063: 1058: 1053: 1051:Thoughtography 1048: 1043: 1038: 1036:Superconscious 1033: 1028: 1023: 1018: 1016:Retrocognition 1013: 1011:Remote viewing 1008: 1003: 998: 993: 988: 983: 978: 973: 968: 963: 958: 953: 948: 943: 938: 933: 928: 923: 918: 913: 908: 903: 898: 893: 888: 883: 878: 873: 868: 863: 858: 853: 848: 843: 837: 835: 831: 830: 825: 822: 821: 818:Parapsychology 816: 814: 813: 806: 799: 791: 783: 782: 766: 750: 738:Harold Puthoff 726: 710: 702:Remote viewing 690: 686:978-0521758932 669: 666:978-1573927987 644: 628: 612: 596: 580: 560: 544: 541:978-0521608343 510: 500:Julie Milton, 493: 470: 446: 430: 414: 410:978-1405181228 391: 378: 357: 341: 325: 309: 288: 287: 285: 282: 237:Harold Puthoff 223:Remote viewing 221:Main article: 218: 217:Remote viewing 215: 166:Main article: 163: 160: 90:Helmut Schmidt 82:John E. Coover 70:Creery sisters 48:Parapsychology 46:Main article: 35: 32: 13: 10: 9: 6: 4: 3: 2: 1393: 1382: 1379: 1377: 1374: 1373: 1371: 1356: 1355: 1346: 1344: 1343: 1334: 1333: 1330: 1324: 1323: 1319: 1317: 1316: 1312: 1310: 1309: 1305: 1303: 1302: 1298: 1296: 1295: 1291: 1289: 1288: 1284: 1282: 1281: 1277: 1275: 1274: 1270: 1268: 1267: 1263: 1261: 1260: 1256: 1254: 1253: 1249: 1247: 1246: 1242: 1240: 1239: 1235: 1233: 1232: 1228: 1227: 1225: 1221: 1215: 1212: 1210: 1207: 1206: 1204: 1200: 1194: 1191: 1189: 1186: 1184: 1181: 1179: 1176: 1174: 1171: 1169: 1166: 1164: 1161: 1159: 1156: 1154: 1151: 1149: 1146: 1145: 1143: 1139: 1133: 1130: 1128: 1125: 1123: 1120: 1118: 1115: 1113: 1110: 1108: 1105: 1103: 1100: 1098: 1095: 1093: 1090: 1088: 1085: 1083: 1080: 1078: 1075: 1074: 1072: 1068: 1062: 1059: 1057: 1054: 1052: 1049: 1047: 1044: 1042: 1039: 1037: 1034: 1032: 1031:Spoon bending 1029: 1027: 1024: 1022: 1019: 1017: 1014: 1012: 1009: 1007: 1006:Reincarnation 1004: 1002: 999: 997: 994: 992: 989: 987: 984: 982: 979: 977: 974: 972: 969: 967: 964: 962: 959: 957: 954: 952: 949: 947: 944: 942: 939: 937: 934: 932: 929: 927: 924: 922: 919: 917: 914: 912: 909: 907: 904: 902: 899: 897: 894: 892: 889: 887: 884: 882: 879: 877: 874: 872: 869: 867: 864: 862: 859: 857: 854: 852: 849: 847: 844: 842: 839: 838: 836: 832: 828: 823: 819: 812: 807: 805: 800: 798: 793: 792: 789: 779: 775: 770: 767: 763: 759: 758:Terence Hines 754: 751: 747: 743: 739: 735: 730: 727: 723: 719: 714: 711: 707: 703: 699: 694: 691: 687: 683: 679: 673: 670: 667: 663: 659: 658: 653: 648: 645: 641: 637: 632: 629: 625: 621: 620:Terence Hines 616: 613: 609: 605: 600: 597: 593: 589: 584: 581: 577: 573: 569: 564: 561: 557: 553: 548: 545: 542: 538: 534: 530: 526: 521: 519: 517: 515: 511: 507: 503: 497: 494: 490: 486: 481: 479: 477: 475: 471: 467: 466: 461: 460: 455: 450: 447: 443: 439: 434: 431: 427: 423: 422:Terence Hines 418: 415: 411: 407: 403: 402: 395: 392: 388: 382: 379: 375: 371: 367: 361: 358: 354: 350: 345: 342: 338: 334: 329: 326: 322: 318: 313: 310: 306: 302: 298: 293: 290: 283: 281: 278: 273: 270: 269:transcripts. 267: 261: 256: 255:has written: 254: 249: 244: 242: 241:Terence Hines 238: 234: 230: 224: 216: 214: 210: 205: 202: 198: 196: 195:documentation 191: 187: 179: 174: 169: 161: 159: 157: 152: 147: 144: 140: 134: 132: 126: 124: 120: 119:psychokinesis 113: 108: 107:has written: 106: 105:Terence Hines 102: 98: 93: 91: 87: 83: 79: 75: 71: 67: 63: 59: 55: 49: 40: 33: 31: 29: 24: 22: 18: 1353: 1340: 1320: 1313: 1306: 1299: 1292: 1287:Mental Radio 1285: 1278: 1271: 1264: 1257: 1250: 1243: 1236: 1229: 1223:Publications 1025: 1021:Second sight 971:Precognition 861:Clairvoyance 777: 769: 761: 753: 745: 742:Russell Targ 734:Charles Tart 729: 721: 713: 693: 677: 672: 655: 647: 639: 631: 623: 615: 607: 599: 591: 583: 563: 555: 547: 532: 528: 505: 496: 488: 463: 458: 454:James Alcock 449: 441: 433: 425: 417: 400: 394: 386: 381: 373: 365: 360: 352: 344: 336: 328: 320: 312: 292: 277:Charles Tart 274: 271: 263: 258: 251: 246: 233:Russell Targ 226: 212: 207: 203: 199: 183: 148: 136: 128: 115: 110: 94: 74:Soal–Goldney 66:sensory cues 51: 25: 16: 15: 1061:Zener cards 1041:Telekinesis 1001:Pyrokinesis 996:Psychometry 966:Poltergeist 774:David Marks 700:. (1997). " 698:James Randi 652:David Marks 604:David Marks 588:David Marks 485:John Sladek 266:James Randi 229:David Marks 123:John Sladek 97:J. B. Rhine 42:Zener cards 1370:Categories 1056:Xenoglossy 946:Paranormal 921:Mediumship 911:Levitation 856:Bilocation 760:. (2003). 744:. (1980). 720:. (1980). 638:. (1993). 622:. (2003). 606:. (1981). 504:. (2002). 487:. (1974). 456:. (2011). 440:. (1970). 424:. (2003). 372:. (1985). 370:Paul Kurtz 351:. (1989). 335:. (1980). 319:. (1952). 299:. (2014). 284:References 180:experiment 28:Zener card 1046:Telepathy 881:Ectoplasm 572:"Ganzfeld 525:Ray Hyman 349:Ray Hyman 275:In 1980, 178:telepathy 139:telepathy 62:Ray Hyman 1342:Category 72:and the 60:(1980), 56:(1952), 1354:Commons 976:Psychic 827:Outline 125:wrote: 34:History 1202:People 901:Ghosts 834:Topics 684:  664:  539:  408:  88:, and 851:Auras 704:" in 574:" in 303:" in 682:ISBN 662:ISBN 537:ISBN 406:ISBN 235:and 184:The 131:dice 931:Orb 368:in 101:ESP 21:psi 1372:: 740:, 736:, 527:. 513:^ 473:^ 462:. 243:: 158:. 84:, 810:e 803:t 796:v 578:. 307:.

Index

psi
Zener card

Parapsychology
Donovan Rawcliffe
C. E. M. Hansel
Ray Hyman
sensory cues
Creery sisters
Soal–Goldney
Smith-Blackburn
John E. Coover
Joseph Gaither Pratt
Helmut Schmidt
J. B. Rhine
ESP
Terence Hines
psychokinesis
John Sladek
dice
telepathy
Duke Parapsychology Laboratory
Duke University
card manipulation
Ganzfeld experiment

telepathy
Ganzfeld experiment
Charles Honorton
documentation

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