In law, a witness is someone who, either voluntarily or under compulsion, provides testimonial evidence, either oral or written, of what they know or claim to know.
Legal psychology is a field focused on the application of psychological principles within the legal system and its interactions with individuals. Professionals in this area are involved in understanding, assessing, and questioning suspects, evaluating potential jurors, investigating crimes and crime scenes, conducting forensic investigations, and handling other legal contexts. The term "legal psychology" distinguishes this practical branch of psychology from the more theory-oriented field of clinical psychology.
A police lineup or identity parade is a process by which a crime victim or witness's putative identification of a suspect is confirmed to a level that can count as evidence at trial.
Claude Mason Steele is a social psychologist and emeritus professor at Stanford University, where he is the I. James Quillen Endowed Dean, Emeritus at the Stanford University Graduate School of Education, and Lucie Stern Professor in the Social Sciences, Emeritus.
Lisa Feldman Barrett is a Canadian-American psychologist. She is a University Distinguished Professor of psychology at Northeastern University, where she focuses on affective science and co-directs the Interdisciplinary Affective Science Laboratory. She has received both of the highest scientific honors in the field of psychology, the William James Fellow Award from the Association for Psychological Science for 2025, and the Award for Distinguished Scientific Contributions from the American Psychological Association for 2021. Along with James Russell, she is the founding editor-in-chief of the journal Emotion Review. Along with James Gross, she founded the Society for Affective Science.
David Ian Perrett FBA FRSE is a professor of psychology at the University of St Andrews in Scotland, where he leads the Perception Lab. The main focus in his team's research is on face perception, including facial cues to health, effects of physiological conditions on facial appearance, and facial preferences in social settings such as trust games and mate choice. He has published over 400 peer-reviewed articles, many of which appearing in leading scientific journals such as the Proceedings of the Royal Society of London Series B—Biological Sciences, Psychological Science, and Nature.
Kathy Pezdek is Professor and Associate Dean of the School of Behavioral and Organizational Sciences (SBOS), Claremont Graduate University in Claremont, California. Dr. Pezdek is a cognitive psychologist specializing in the study of eyewitness memory. She frequently serves as an expert witness in the area of eyewitness identification and has testified on this topic in Federal, State and Superior Court cases. Her extensive research has focused on a range of topics related to Law and Psychology that apply to both adults and children. These topics include face memory, false memory, suggestibility of memory, lineup techniques, and detecting deception. Kathy Pezdek is a Fellow of the American Psychological Society, has served as Editor of Applied Cognitive Psychology and is currently on the Editorial Boards of the Journal of Applied Psychology and Legal and Criminological Psychology.
In eyewitness identification, in criminal law, evidence is received from a witness "who has actually seen an event and can so testify in court".
The cross-race effect is the tendency to more easily recognize faces that belong to one's own racial group, or racial groups that one has been in contact with. In social psychology, the cross-race effect is described as the "ingroup advantage," whereas in other fields, the effect can be seen as a specific form of the "ingroup advantage" since it is only applied in interracial or inter-ethnic situations. The cross-race effect is thought to contribute to difficulties in cross-race identification, as well as implicit racial bias.
Saul Kassin is an American academic, who serves as a professor of psychology at the City University of New York's John Jay College of Criminal Justice and Massachusetts Professor Emeritus of Psychology at Williams College in Williamstown, Massachusetts.
Phoebe C. Ellsworth is an American social psychologist and professor at the University of Michigan, holding dual appointments at the Psychology Department and in the Law School.
Eyewitness testimony is the account a bystander or victim gives in the courtroom, describing what that person observed that occurred during the specific incident under investigation. Ideally this recollection of events is detailed; however, this is not always the case. This recollection is used as evidence to show what happened from a witness' point of view. Memory recall has been considered a credible source in the past, but has recently come under attack as forensics can now support psychologists in their claim that memories and individual perceptions can be unreliable, manipulated, and biased. As a result of this, many countries, and states within the United States, are now attempting to make changes in how eyewitness testimony is presented in court. Eyewitness testimony is a specialized focus within cognitive psychology.
Eyewitness memory is a person's episodic memory for a crime or other witnessed dramatic event. Eyewitness testimony is often relied upon in the judicial system. It can also refer to an individual's memory for a face, where they are required to remember the face of their perpetrator, for example. However, the accuracy of eyewitness memories is sometimes questioned because there are many factors that can act during encoding and retrieval of the witnessed event which may adversely affect the creation and maintenance of the memory for the event. Experts have found evidence to suggest that eyewitness memory is fallible.
Gail S. Goodman is an American psychologist, known as one of the first in her field to study children's roles in the legal system, specifically children's eyewitness testimony pertaining to the Sixth Amendment. Her awards for her contributions to research, writing, and teaching include the American Psychological Association Award for Distinguished Contributions to Psychology in the Public Interest in 2017. Her involvement includes being cited in United States Supreme Court cases, which is rare for psychologists.
Roderick Cameron Lodge Lindsay is a Canadian psychologist who studies the area of psychology and law, and focuses on eyewitness memory. In 1974, he received his bachelor's degree at the University of Toronto and in 1978 he received his master's degree from the University of Alberta. Lindsay also received his Ph. D from the University of Alberta in 1982.
Gary L. Wells is an American psychologist and a scholar in eyewitness memory research. Wells is a professor at Iowa State University with a research interest in the integration of both cognitive psychology and social psychology and its interface with law. He has conducted research on lineup procedures, reliability and accuracy of eyewitness identification. Wells has received many awards and honorary degrees, and he has gained recognition for his work and contributions to psychology and criminal justice.
John Donald Read is a Canadian psychologist and is currently employed as professor of psychology and chair of the psychology department at Simon Fraser University in Canada. He works primarily in the field of Law and Forensics and has conducted research in the fields of human memory, eyewitness memory and the legal system.
D. Stephen Lindsay is a cognitive psychologist in the field of memory, and a professor of psychology at the University of Victoria (UVic), British Columbia. He received his PhD from Princeton University in 1987.
Verbal overshadowing is a phenomenon where giving a verbal description of sensory input impairs formation of memories of that input. This was first reported by Schooler and Engstler-Schooler (1990) where it was shown that the effects can be observed across multiple domains of cognition which are known to rely on non-verbal knowledge and perceptual expertise. One example of this is memory, which has been known to be influenced by language. Seminal work by Carmichael and collaborators (1932) demonstrated that when verbal labels are connected to non-verbal forms during an individual's encoding process, it could potentially bias the way those forms are reproduced. Because of this, memory performance relying on reportable aspects of memory that encode visual forms should be vulnerable to the effects of verbalization.
Face space is a theoretical idea in psychology such that it is a multidimensional space in which recognizable faces are stored. The representation of faces within this space are according to invariant features of the face itself. However, recently it was theoretically demonstrated that faces can be stored in the face space according to their dynamic features as well, and that in this case the resulting space exhibits a twofold structure.
