Prominent publications by Hadyn D Ellis

KOL Index score: 9214

Three experiments are reported in which recognition of faces from whole faces or internal or external features was compared. In the first experiment, where the faces were of famous people, an advantage was found for identification from internal features. In the second experiment involving unfamiliar faces, however, no difference was found in recognition rates when subjects were given the internal or the external features. In a third experiment famous faces were presented and mixed with ...

Known for Familiar Faces |  Experiment Recognition |  Internal External Features |  Feature Saliency |  Famous People
KOL Index score: 7207

The study describes the Cardiff Anomalous Perceptions Scale (CAPS), a new validated measure of perceptual anomalies. The 32-item CAPS measure is a reliable, self-report scale, which uses neutral language, demonstrates high content validity, and includes subscales that measure distress, intrusiveness, and frequency of anomalous experience. The CAPS was completed by a general population sample of 336 participants and 20 psychotic inpatients. Approximately 11% of the general population ...

Known for Anomalous Perceptual Experience |  Perceptions Scale |  General Population Sample |  Psychotic Disorders |  Perceptual Anomalies
KOL Index score: 6788

People experiencing the Capgras delusion claim that others, usually those quite close emotionally, have been replaced by near-identical impostors. Ellis & Young suggested in 1990 that the Capgras delusion results from damage to a neurological system involved in orienting responses to seen faces based on their personal significance. This hypothesis predicts that people suffering the Capgras delusion will be hyporesponsive to familiar faces. We tested this prediction in five people with ...

Known for Capgras Delusion |  Autonomic Responses |  Psychotic Disorders |  Familiar Faces |  Ellis Young
KOL Index score: 6373

Introduction: Patients with Capgras delusion believe that certain individuals have been replaced by duplicates. Unlike normal people, these patients also show reduced autonomic responses to familiar faces, indicating the possibility that it is the covert processes of recognition that are impaired (Ellis, et al., 1997). It has been suggested that such patients would show normal autonomic responses to voices. An auditory parallel of this typical delusion, therefore, is theoretically ...

Known for Capgras Delusion |  Familiar Faces |  Autonomic Responses |  Skin Conductance |  Models Recognition
KOL Index score: 6053

The hypothesis that subjects would show superior memory for faces of members of their own ethnic group compared with those of a different ethnic group was tested in a cross-cultural experiment. Thirty two African and 32 European subjects were presented with coloured photographs of ten black Africans and ten white Europeans, with the instruction to try to remember them. Twenty four hours later, the subjects were presented with the same photographs shuffled with an equal number of new ...

Known for Recognition Memory |  African Faces |  European Subjects |  Ethnic Groups |  New Photographs
KOL Index score: 5972

Introduction. This study was designed to elucidate the relationship between different types of covert face recognition. Some patients with prosopagnosia (i.e., the profound inability to recognise previously familiar faces) nonetheless evince autonomic face recognition (elevated skin-conductance levels to familiar faces) or behavioural indices of covert recognition (i.e., priming; interference effects; matching effects; face-name learning). One prosopagnosic patient revealed both ...

Known for Capgras Delusion |  Familiar Faces |  Covert Recognition |  Autonomic Responses |  Patients Prosopagnosia
KOL Index score: 5428

H. Ellis (1986a, b) has suggested that identification of familiar faces is achieved as the end result of some kind of perceptual hierarchy, in which structural descriptions are elaborated to allow successively finer levels of discrimination. Specifically, he suggests that classification of the age, sex, and race of faces precedes their identification. Here we report two experiments which challenge a simple hierarchical relationship between judging the sex and knowing the identity of a ...

Known for Sex Identity |  Familiar Faces |  Pattern Recognition |  Experiment 2 |  Perception Humans
KOL Index score: 5299

In two experiments, we explored the effects of co-occurrence and semantic relationships in the associative priming of faces. In Experiment 1, pairs of computer-generated human faces were presented simultaneously (i.e., they co-occurred) with no associated semantic information attached to them. A significant facilitation effect in the subsequent recognition of these paired faces (priming) was observed. Thus, repeatedly presenting faces together while keeping semantic information to a ...

Known for Associative Priming |  Semantic Relatedness |  Computergenerated Faces |  Recognition Visual |  Male Mental
KOL Index score: 5035

An experiment was carried out designed primarily to test A B Joseph's suggestion that patients with Capgras delusion may have problems integrating information between the two cortical hemispheres; and at the same time it was meant to examine J Cutting's ideas linking schizophrenia in general, and the Capgras delusion in particular, to right hemisphere dysfunction. Three patients with the Capgras delusion and three matched controls diagnosed as paranoid schizophrenics were briefly ...

Known for Capgras Delusion |  Hemisphere Dysfunction |  Schizophrenia Paranoid |  Neuropsychological Tests |  Reaction Time
KOL Index score: 4952

Two experiments exploring the differential processing of distinctive and typical faces by adults and children are reported. Experiment 1 employed a recognition memory task. On three out of four dimensions of measurement, children of 5 years of age did not show an advantage for distinctive faces, whereas older children and adults did. In Experiment 2, however, subjects of all ages classified typical faces faster than distinctive ones in a face/non-face decision task: the 5-year-olds ...

Known for Distinctive Faces |  Adults Children |  5 Years |  Preschool Discrimination |  Facial Expression
KOL Index score: 4873

The effect of feature displacement within two well-known faces (Terry Wogan and Cyril Smith) was examined. Image processing equipment was used to produce stimuli in which the features of an original facial image were displaced to form a number of modified images. This technique was first reported by Haig, in a recognition study in which the effect of feature displacement within unfamiliar faces was investigated. In the present experiment a perceptual judgement task was carried out in ...

Known for Eyes Mouth |  Facial Features |  Unfamiliar Faces |  Recognition Study |  Form Perception
KOL Index score: 4686

The primary aim of this investigation was to assess to what extent Rourke's (1989, 1995) nonverbal learning disabilities syndrome (NLD) model resembles the pattern of assets and deficits seen in people with Asperger syndrome (AS). NLD can be characterized by a cluster of deficits primarily affecting nonverbal aspects of functioning, in the presence of proficiency in single word reading and a superior verbal memory. The neurological underpinnings of this syndrome may be dysfunction of ...

Known for Asperger Syndrome |  Hemisphere Functioning |  Functional Laterality Humans |  White Matter |  Visual Memory
KOL Index score: 4552

The time it takes to read or produce a word is influenced by the word's age of acquisition (AoA) and its frequency (e.g. Quarterly Journal of Experimental Psychology 12 (1973) 85). Lewis (Cognition 71 (1999) B23) suggested that a parsimonious explanation would be that it is the total number of times a word has been encountered that predicts reaction times. Such a cumulative-frequency hypothesis, however, has always been rejected because the statistical effects of AoA and frequency are ...

Known for Aoa Frequency |  Acquisition Effects |  Reaction Time |  Word Age |  Development Learning


Hadyn D Ellis: Influence Statistics

Sample of concepts for which Hadyn D Ellis is among the top experts in the world.
Concept World rank
faces righthanded children #1
light hemisphere asymmetry #1
thresholds reports #1
recalling faces #1
subjects superior memory #1
facial “type cadc #1
capgras delusion #1
publication adult crime #1
press 551 #1
visually impaired sample #1
intégrer facilement #1
patients syndrome capgras #1
difficulties asperger syndrome #1
1116 years adolescents #1
voice recognition diagnosis #1
specific capgras #1
discrimination difficulties experiment #1
faces expt #1
simply cumulative #1
“photofit police #1
performance expressions test #1
array nose #1
deficits nonverbal aspects #1
pilot experiment faces #1
photofit kit differences #1
processes underlying recognition #1
methods target faces #1
courbon fail courbon #1
familiar faces implications #1
preattentive processing template #1
devenus #1
masking faces #1
distinct alexia #1
courbon fail tusques #1
curvilinear learning #1
capgras delusion ellis #1
original 20 faces #1
delusion capgras #1
typical target faces #1
cumulative frequency item #1
social judgment test #1

Key People For Capgras Delusion

Top KOLs in the world
Andrew W Young
facial expression familiar faces repetition priming
Hadyn D Ellis
capgras delusion familiar faces asperger syndrome
Karel W De Pauw
capgras delusion personal disturbance scale psychotic patients
Vilayanur Subramanian Ramachandran
apparent motion phantom limbs mirror neuron
William Hirstein
executive processes autistic children child soldiers
Max Coltheart
iconic memory cognitive neuropsychology delusional belief

Hadyn D Ellis:Expert Impact

Concepts for whichHadyn D Ellishas direct influence:Capgras delusion,  Familiar faces,  Asperger syndrome,  Delusional misidentification,  Autonomic responses,  Black faces,  Visual fields,  Feature displacement.

Hadyn D Ellis:KOL impact

Concepts related to the work of other authors for whichfor which Hadyn D Ellis has influence:Familiar faces,  Capgras syndrome,  Facial expressions,  Autism spectrum disorder,  Holistic processing,  Delusional misidentification,  Visual perception.



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From the School of Psychology, Cardiff University, UK. | School of Psychology, Cardiff University, Cardiff, United Kingdom | School of Psychology, Cardiff University, Cardiff, UK | School of Psychology, Cardiff University, Cardiff CF10 3AT, UK | Scho

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