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PubMed2004

Floral evolution and pollinator mate choice in a sexually deceptive orchid.

Sexually deceptive orchids mimic sex pheromones and appearance of female insects to attract males, which pollinate the flowers in an attempted mating. This study examines the effects of pollinator mate choice on orchid floral evolution using the Thynnine wasp Neozeleboria cryptoides (Smith) (Hymenoptera: Tiphiidae), which pollinates the sexually deceptive orchid Chiloglottis trapeziformis Fitzg. (i) When male wasps were given the choice between two female dummies of different sizes and identical amount of synthetic pheromone, they preferentially attempted to copulate with medium-sized dummies over small dummies. (ii) When given the choice between two dummies of identical size but different amounts of pheromone, males preferred the larger amount of pheromone. Larger amounts of pheromone generally attracted more males than smaller amounts. (iii) Orchid flower labella, which mimic a female body, were significantly longer and broader than female wasp bodies, and the flowers also produced on average 10 times more 'pheromone' than females. The evolution and maintenance of these exaggerated mating signals is likely to be mediated by the male pollinator behaviour demonstrated here. (iv) When five dummies were offered simultaneously in a 10 cm circular array, males rarely attempted copulation on more than one dummy during a single visit. This behaviour may foster the evolution or maintenance of clonality in C. trapeziformis, as it will minimize pollen exchange within clones.

Animals↗
PubMed1984

[Untruth and self-deception as fundamental dimensions of human existence: the problem of the unconscious].

The models of Freud on unconsciousness lead to logical contradictions or to a fragmentation of the person if the causal energetic view of mental organization is abandoned in favour of a metaphorical interpretation of Freud's concept. On the other hand, the person is eliminated in such an causel energetic model. Existential psychotherapies refer to Heidegger who claims that consciousness is not completely self-transparent and may conceal itself by forgetting and remembering in correspondence with the interests of the person. Self- concealment of consciousness as a source of unconsciousness is a process of disintegration of sense. Therefore, the therapy should lead the patient to discover his potentialities, to enable him to recognize untruth and self-deception as contradictions to these potentialities. Untruth and self-deception are-as Nietzsche has already shown-dimensions of the unconsciousness.

Humans↗
PubMed1994

Nonverbal signs of deception during posthypnotic amnesia: a brief communication.

The question of hypnotic subjects complying with instructions, perhaps even purposely deceiving the hypnotist or deceiving themselves, has arisen from the state-nonstate (skeptical-credulous) theoretical controversy. However, experimental testing of competing hypotheses has been difficult. The current report offers methodological procedures that may prove useful. Subjects who were given posthypnotic amnesia instructions were tested on free recall and implicit recall of a 20-word list. To detect the possibility of deception, videotapes of real subjects and simulating subjects during and after posthypnotic amnesia were rated for nonverbal signs of deception, signs taken from the works of Ekman, Ekman and Friesen, and Zuckerman et al. Preliminary results were gathered on a small pilot sample, and recommendations for procedural improvements are proposed.

Awareness↗
PubMed2003

Endometrial endometrioid adenocarcinoma with a deceptive pattern of spread to the uterine cervix: a manifestation of stage IIb endometrial carcinoma liable to be misinterpreted as an independent carcinoma or a benign lesion.

The prognosis of endometrial endometrioid adenocarcinoma is determined in part by stage; endocervical stromal involvement (stage IIB) imparts a worsened prognosis. We describe a deceptive pattern of stage IIB disease that mimics a primary endocervical glandular proliferation and may lead to understaging of endometrial endometrioid adenocarcinoma. Fifteen cases of endometrial endometrioid adenocarcinoma with a peculiar pattern of cervical involvement were identified from our consultation files. All cases were referred in consultation because of doubt about the nature of the cervical process and its relation to the corpus tumor; in a few instances, the cervical proliferation was considered possibly benign and in one case was misinterpreted as mesonephric hyperplasia. The patients ranged from 49 to 84 years in age (mean age 64.9 years). There was usually a grossly evident endometrial tumor. The cervix was unremarkable grossly in at least 11 patients. The cervical tumors were composed of variably shaped, often tubular glands with little or no stromal response and mainly invaded as widely spaced glands that often appeared deceptively benign. In 14 cases luminal secretions, mainly eosinophilic, were identified, often leading to consideration of a mesonephric lesion. Ten of the endometrial tumors were grade 1, four grade 2, and one grade 3. One was noninvasive, nine superficially invasive, and five deeply invasive. In four cases myoinvasion had, at least in part, a diffusely infiltrative pattern. The tumors in the cervix showed no in situ component and no definite surface involvement. Continuity with the corpus tumor could be demonstrated in 12 cases. Ten of the cervical tumors invaded more deeply than the endometrial tumor, four invaded to a similar depth, and only one was more superficial than its endometrial counterpart. The cervical and corpus tumors had a similar immunoprofile in nine cases: all were vimentin positive, eight estrogen positive and one negative, four carcinoembryonic antigen negative, and five with focal apical or rare cytoplasmic staining. This immunoprofile in conjunction with routine morphologic similarity between the two tumors and the usual documented continuity between them indicate that the cervical process represents spread from the endometrial endometrioid adenocarcinoma. It is important for both therapeutic and prognostic reasons that the cervical abnormality is not misinterpreted as a benign or malignant primary endocervical glandular process.

Aged↗
PubMed2002

A phylogenetic study of pollinator conservatism among sexually deceptive orchids.

Orchids of the genus Chiloglottis are pollinated through the sexual deception of male wasps mainly from the genus Neozeleboria (Tiphiidae: Thynninae). The orchids mimic both the appearance and sex pheromones of wingless female thynnines but provide no reward to the deceived males. Despite the asymmetry of this interaction, strong pollinator specificity is typical. Such plant-pollinator interactions would seem to be relatively flexible in the plant's adaptive response to variation in the local pollinator resource. However, we present DNA sequence data on both orchids and wasps that demonstrate a pattern of pollinator conservatism operating at a range of taxonomic levels. Sequence data from the wasps indicate 15 of 16 Chiloglottis pollinators are closely related members of one clade of Thynninae. A pattern of congruence between orchid and wasp phylogenies is also demonstrated below the generic level, such that related orchids tend to use related thynnine wasps as specific pollinators. Comparative physiological data on the wasp responses to the floral scents of two Chiloglottis species and one outgroup, Arthrochilus, indicate similar attractive volatile chemicals are used by related orchid taxa. By extension, we infer a similarity of sex pheromone signals among related thynnines. Thus, the conservative pattern of pollinator change in sexually deceptive orchids may reflect phylogenetic patterns in the sex pheromones of their pollinators.

Base Sequence↗
PubMed2005

Phylogeography of pollinator-specific sexually deceptive Chiloglottis taxa (Orchidaceae): evidence for sympatric divergence?

Divergence in sexually deceptive orchids is thought to occur through shifts in the attraction of specific pollinators, a process that is mediated by changes in the floral odours that lure sexually excited male insects. We investigated the origin of reproductive isolation in a sexually deceptive species complex of Chiloglottis R.Br. (Orchidaceae: Diurideae). Two geographically separated montane regions in eastern Australia were sampled, each containing sympatric pairs of orchid taxa presently found under the name, Chiloglottis pluricallata. Behavioural tests confirmed at least three distinct orchid taxa that specifically attract different pollinators. An artificial crossing experiment among two taxa from one region demonstrated their interfertility, and confirmed isolation to be a function of pollinator attraction. A phylogeographic analysis using amplified fragment length polymorphisms (AFLPs) indicated that samples from each geographical region are most closely related, a pattern consistent with in situ or sympatric divergence. However, an extensive population genetic study on two taxa from one region failed to entirely reject the possibility of intertaxon gene flow. Although clear genetic differentiation of the taxa is evident in two out of three sites where both grow in direct sympatry, overall, the two taxa are not strongly distinguished by AFLP markers. The reconstruction of a simple bifurcating pattern of divergence may be confounded by a combination of contemporary population-level processes operating within each taxon, the retention of ancestral polymorphism or intertaxon gene flow.

Alleles↗
PubMed2002

Withholding life prolonging treatment, and self deception.

OBJECTIVES: To compare non-treatment decision making by general practitioners and geriatricians in response to vignettes. To see whether the doctors' decisions were informed by ethical or legal reasoning. DESIGN: Qualitative study in which consultant geriatricians and general practitioners (GPs) randomly selected from a list of local practitioners were interviewed. The doctors were asked whether patients described in five vignettes should be admitted to hospital for further care, and to give supporting reasons. They were asked with whom they would consult, who they believed ought to make such decisions, and whether the relatives' preferences would influence their decision making. MAIN MEASURES: To analyse the factors influencing the doctors' decisions not to admit otherwise terminally ill patients to hospital for life prolonging treatment. RESULTS: Seventeen GPs and 18 geriatricians completed the interview. All vignettes produced strong concordance in decision making between both groups. Ten per cent of the doctors would provide life prolonging treatment to patients with severe brain damage. Most would admit a surgical patient regardless of age or disability. Medical reasons were largely used to explain decision making. The wishes of relatives were influential and resource considerations were not. There was variability regarding decision making responsibility. CONCLUSIONS: Little attempt was made to link decision making with ethical or legal concepts and there may have been non-recognition, or denial, of the ethical consequences of failure to admit. The process of decision making may involve deception. This may be conscious, because of the illegality of euthanasia, or unconscious (self deception), because of deepseated medical and societal reluctance to accept that intentionally withholding life prolonging treatment may equate with intentionally causing death.

Aged↗
PubMed1995

Inner speech as a cognitive process mediating self-consciousness and inhibiting self-deception.

The cognitive processes which mediate self-consciousness are unknown. although Morin and others have suggested that inner speech may mediate self-consciousness. We developed a questionnaire which measures the extent to which one talks to oneself about oneself. As expected, the correlation between inner speech and self-consciousness was significant. A German version of the 1979 self-deception questionnaire by Sackeim and Gur correlated negatively with the scores on inner speech, suggesting the validity of the questionnaire. We also replicated the negative association between depression and self-deception in a different culture.

Adult↗
PubMed1989

Informed consent, deception, and the use of disguised alcohol questionnaires.

In preparation for a physician intervention trial to determine the effectiveness of treatment of alcoholism in a primary care setting, a study was conducted to determine patient reaction to a masked alcohol screening questionnaire. The disguised questionnaire was developed to improve the accuracy of self-reported drinking behavior and facilitate blinded randomization to an intervention and control group. Patient reaction was determined by a face-to-face structured interview. The interview was structured to elicit responses before and after the patient was informed of the true nature of the questionnaire. The sample consisted of 21 alcoholic and 33 nonalcoholic patients in a primary care clinic. Seventy-five percent of the respondents were comfortable not being fully informed when research procedures involve the use of disguised alcohol questionnaires. There was some discomfort over the deceptive nature of the questionnaire, but 83% of the subjects believed the deception was justified and necessary. Males and alcoholics in the sample were more comfortable not being fully informed about research procedures suggesting greater trust in the medical profession. Females, on the other hand, were more concerned than males about how a family member would react to the disclosure of family health information. Alcoholics and persons with only a high school education felt the use of disguised questionnaires improved their accuracy significantly more often than nonalcoholics or individuals in the sample who attended graduate school.

Adult↗
PubMed1990

[Usefulness of the repeated presentation of questions on the psychophysiological detection of deception].

Two experiments were conducted to assess the usefulness of repeated questioning for the psychophysiological detection of deception. Twenty-four female subjects were instructed to conceal the critical item which they had previously selected, and their skin conductance response (SCR) was simultaneously recorded. In Experiment 1, the amplitudes of SCR to both critical and noncritical items tended to decrease. However, responses to the critical item was consistently larger than that to other noncritical ones during the total of nine presentations in this series where the critical item was pseudo-randomly inserted among the four non-critical items. In Experiment 2, the difference of SCR to the critical and noncritical items was enhanced compared with Experiment 1 at the first exposure in three successive presentations, though this difference was diminished at the following 2nd and 3rd presentations. These results suggest that the successive presentations of stimulus under the detection of deception would be effective to discriminate the responses to critical item from noncritical items, and they are discussed in terms of stimulus significance.

Adult↗
PubMed2001

[Effects of a mental countermeasure on the physiological detection of deception using the event-related brain potentials].

This study focused on the effects of a mental countermeasure on the detection of deception using the P300 component of event-related brain potentials. Thirty-three subjects were divided into two groups: a countermeasure (CM) group and a non-countermeasure (NCM) group. The CM group was instructed to count backwards by sevens during the experiment. Relevant stimuli were subjects' own family names and irrelevant stimuli were four other typical Japanese family names. The subjects were required to press a button when the name stimuli were presented on a CRT display. The use of the mental countermeasure significantly prolonged reaction time to the stimuli and reduced overall P300 amplitudes. The P300 amplitudes to the relevant stimuli, however, were consistently larger than those to the irrelevant stimuli in both groups. The correct detection rate of the relevant stimuli was 81% in the CM and 94% in the NCM group, but the difference was not statistically significant. These findings indicate that deception can still be detected by using P300, in spite of the use of the countermeasures by subjects.

Adult↗
PubMed1998

Young children's difficulty acknowledging false belief: realism and deception.

This study was designed to help clarify some of the circumstances under which young children find it easier to acknowledge a false belief held by another person. In Experiment 1, preschoolers (mean age, 3 years; 11 months) watched a movie in which Ness had previously opened a familiar box in Jon's absence to reveal the stereotypical content, which she proceeded to replace with an atypical item. In a second movie, the box was seen to house an atypical content all along. Half the children watched Ness play the script in a neutral manner, while the rest watched her play it in a deceptive manner. There was a highly significant improvement in acknowledging Jon's false belief when children saw the stereotypical content of the box preliminary to its exchange for something atypical. In contrast, children gained no benefit from the way Ness played the script. The effect was replicated in a second experiment in which children were involved directly in the task. We conclude that presenting a physical instantiation of a false belief helps children to a small but reliable extent to correctly report that belief.

Child Behavior↗
PubMed2004

Detention and deception: limits of ethical acceptability in detention research.

The core of Australia's response to asylum seekers who arrive in an unauthorised manner has been to detain them in immigration detention centres until they are judged to engage Australia's protection obligations or, if they do not, until they are returned to their country of origin. For a number of asylum seekers this has resulted in very prolonged detention. This policy has aroused a storm of controversy with very polarised positions being taken by participants in the debate. In particular, the claim has frequently been made (including by this author) that the circumstances and duration of immigration detention cause substantial harm to the mental health of a significant number of detained asylum seekers. A rational debate on the effects of detention has been hampered by the fact that the Australian government has not allowed researchers access to the detention centres in spite of persistent requests for access by professional bodies. This paper is written in response to the following questions posed by the Journal: Is there a case to be made for individuals agreeing to participate in research studies and for the wider population of current and future detainees to be involved in research without informing either the detention provider or the host nation? Is is legitimate for a researcher to engage in potentially deceptive actions in order to obtain access to such detention facilities to undertake research? What ethical framework should underpin such research? Although there is very little guidance in the literature on the ethical conduct of research in settings such as immigration detention centres, a consideration of the ethical implications of carrying out research in the manner raised by these questions leads this author to conclude that such research cannot be ethically justified. Governments must be persuaded to allow, and to provide substantial support for, ethically conducted research on all aspects of detention. There is also a need for the development of an explicit ethical framework for the conduct of research in settings characterised by a very problematic human rights context.

Australia↗
PubMed1998

[Artifactual disorders--between deception and self-mutilation. Experiences in consultation psychiatry at a university clinic].

During a 18-year-period 93 patients (f = 76, m = 17) with a factitious disorder were identified in the psychiatric consultation service of a university hospital (incidence: 0.62%). 50% of women were working in medical professions whereas only 6% of men. Chronic courses of illness were prevailing, but at least one quarter of female patients showed an intermittent type. There was a classical Munchhausen syndrome in 11% of patients. Depressive and anxiety disorders (10%, 4%) were to be respected as psychiatric comorbidity. Ca 25% of the patients suffered from a somatic illness in addition to the factitious disorder, and one third of the women had symptoms of psychosomatic, especially of eating disorders. Previous somatoform disorders, deliberate self harm and attempts of suicide were to be noted in the psychiatric history of many patients. There were frequent traumatizing events (foster home, disturbing family disharmony, physical and sexual abuse, early losses, serious illnesses) in the early biography. Various psychosocial stressors could be identified in the actual eliciting situation. The results are discussed in respect of epidemiology, development and clinical phenomenology of factitious disorders, psychodynamics and psychopathology of deception and self harm, and therapeutic options in the psychiatric consultation service.

Adult↗
PubMed2005

Detecting deception in children: an experimental study of the effect of event familiarity on CBCA ratings.

The CBCA is the most commonly used deception detection. technique worldwide. Pezdek et al. (2004) used a quasi-experimental design to assess children's accounts of a traumatic medical procedure; CBCA ratings were higher for descriptions of familiar than unfamiliar events. This study tested this effect using an experimental design and assessed the joint effect of familiarity and veracity on CBCA ratings. Children described a true or a fabricated event. Half described a familiar event; half described an unfamiliar event. Two CBCA-trained judges rated transcripts of the descriptions. CBCA scores were more strongly influenced by the familiarity than the actual veracity of the event, and CBCA scores were significantly correlated with age. CBCA results were compared with results from other measures. Together with the results of K. Pezdek et al. (2004) these findings suggest that in its current form, CBCA is of limited utility as a credibility assessment tool.

Child↗
PubMed2006

Hearsay versus children's testimony: Effects of truthful and deceptive statements on jurors' decisions.

Researchers and courts are focusing increasing attention on the reliability of children's out-of-court statements, especially in relation to trials of child sexual abuse. The main goal of this study was to investigate the effects of presentation of children's out-of-court statements (e.g., hearsay) on jurors' perceptions of witness credibility and defendant guilt, and on jurors' abilities to reach the truth. Child participants experienced either a mock crime or were coached to say they experienced the crime when in fact they had not. During elaborate mock trials involving community member jurors, children's testimony was presented either: (1) live, (2) on videotape, or (3) via a social worker. Analyses revealed that testimony format directly influenced jurors' perceptions of child and social worker credibility (e.g., children were perceived as less likely to provide false statements if they testified live) as well as jurors' sympathy toward the child, all of which then predicted jurors' confidence in defendant guilt. Jurors had difficulty discerning accurate from deceptive child statements regardless of testimony format. Implications for psychology and the legal system are discussed.

Adult↗
PubMed1999

P300 scalp amplitude distribution as an index of deception in a simulated cognitive deficit model.

Truth-telling (Truth) and simulated malingering (Malinger) groups were tested in a matching-to-sample procedure in which each sample three-digit number was followed by a series of nine test numbers, only one of which matched the sample. P300 was recorded during test-number presentation. Group analyses revealed differences between the P300s of the groups in unscaled amplitude, but not latency, in response to match and mismatch stimuli. P300 amplitudes at Fz, Cz, and Pz were scaled to remove possible confounding effects of amplitude in tests of the interactions of site with other variables. Significant interactions of both stimulus-type (match vs. mismatch) and group (Truth vs. Malinger) with site were obtained. Within the Malinger group, a significant interaction was obtained (scaled data) between site and response type (honest vs. dishonest). These interactions suggest that deceptive and honest responding are associated with different neurogenerator sets or different sets of P300-overlapping components. In within-individual analyses, 100% of the Truth participants and 87% of the Malinger participants were found to have larger P300 responses at Pz to match stimuli than to mismatch stimuli on the basis of intra-individual bootstrap tests. This represents an improvement in comparison with our related, previous report on a matching-to-sample test using only one test stimulus per sample.

Adolescent↗
PubMed1998

Deception and detection in psychiatric diagnosis.

Deception is ubiquitous in all communication and relationships. It can be conscious, unconscious, or both. It is present in all psychiatric diagnoses as alterations of history, symptom fabrication, symptom enhancement or minimization, and noncompliance with treatment recommendations. We are born better deceivers than we are detectors and untrained intuition may result in very unreliable discrimination. In order to improve our ability to distinguish fact from fiction, the diagnostician must attend to clues in the patient's history and physical and mental status examinations. Laboratory examination, psychological testing, and polygraphy also can be useful adjuncts in detection; however, the first step is always suspicion.

Adolescent↗