The Effects of Alcohol on Crime‐related Memories: A Field Study

This field study investigated to what extent memory of criminally relevant details is affected at (close to) zero (M_BAC = 0.00%), moderate (M_BAC = 0.06%), and high (M_BAC = 0.16%) levels of alcohol intoxication. Participants (N = 76) were approached in bars and were invited to watch a mock crime from a perpetrator perspective. We also measured their blood alcohol concentration levels. After 3–5 days, when participants were sober, they underwent a free and cued recall task about the mock crime. Compared with sober controls, both moderately and highly intoxicated individuals were less complete when recollecting crime details, recalling up to 33% fewer correct details. Overall, intoxicated participants were less accurate during the cued recall task (i.e. they produced more errors) relative to sober participants. These accuracy effects were dose‐dependent for cued recall of salient features. Implications for police interrogations of defendants are discussed. Copyright © 2011 John Wiley & Sons, Ltd.     

Intoxicated Witnesses: Testing the Validity of the Alcohol Myopia Theory

In an assessment of the Alcohol Myopia Theory (AMT), the effects of alcohol on an eyewitness's recall of high‐salience and low‐salience details were investigated. In a laboratory, Study 1 participants watched a staged videoed theft whilst either sober (control or placebo), above (M_BAC = 0.09%) or below (M_BAC = 0.06%) the UK drink‐drive limit. A week later, a free recall and recognition tests were completed. Intoxication was not found to reduce recall accuracy using either recall task. In Study 2, whilst on a night out, participants watched the videoed theft with high (M_BAC = 0.14%) or low (M_BAC = 0.05%) blood alcohol concentrations (BACs). A week later, the free recall and recognition tests were attempted. High BACs were seen to impair recall when memory was assessed through free recall but not with the recognition test. Neither study found the attention narrowing predicted by AMT using either recall technique, although poor recall for low‐salience details in all groups may have contributed to this result. Copyright © 2016 John Wiley & Sons, Ltd.     

The Elusive Effects of Alcohol Intoxication on Visual Attention and Eyewitness Memory

Alcohol is a contributing factor in many crimes, yet little is known of its effects on eyewitness memory and face identification. Some authors suggest that intoxication impairs attention and memory, particularly for peripheral scene information, but the data supporting this claim are limited. The present study therefore sought to determine whether (i) intoxicated participants spend less time fixating on peripheral regions of crime images than sober counterparts, (ii) whether less information is recognised from image regions receiving fewer gaze fixations and (iii) whether intoxicated participants are less able to identify the perpetrator of a crime than sober participants. Contrary to expectations, participants' ability to explore and subsequently recognise the contents of the stimulus scenes was unaffected by alcohol, suggesting that the relationship between intoxication, attention and eyewitness memory requires closer scrutiny. Copyright © 2013 John Wiley & Sons, Ltd.     

Witnesses stumbling down memory lane: The effects of alcohol intoxication,retention interval,and repeated interviewing

Intoxicated eyewitnesses are often discredited by investigators and in court, but few studies have examined how alcohol affects witnesses’ memory. The primary aim of the present study was to examine how intoxication (alcohol vs. control), retention interval (immediate vs. one week delay), and number of interviews (one vs. two interviews) affect witnesses’ memory. The participants (N?=?99) were randomly assigned to consume either orange juice or alcohol mixed with orange juice, and they all witnessed a filmed mock crime afterwards. The recall took place either (a) immediately and after a one week delay or (b) after a one week delay only. No main effect of alcohol was found on the quantity or quality of the witnesses’ statements. Both intoxicated and sober witnesses recalled more details, and were more accurate, during immediate compared to delayed recall. For witnesses interviewed twice, an average of 30% new details were provided in the second compared to the first interview, and these were highly accurate. In sum, contrary to what one can expect, intoxicated witnesses with a low to moderate blood alcohol concentration (below 0.10%) were reliable witnesses.     

Alcohol and remembering a hypothetical sexual assault: Can people who were under the influence of alcohol during the event provide accurate testimony?

We examined the influence of alcohol on remembering an interactive hypothetical sexual assault scenario in the laboratory using a balanced placebo design. Female participants completed a memory test 24 hours and 4 months later. Participants reported less information (i.e., responded “don't know” more often to questions) if they were under the influence of alcohol during scenario encoding. The accuracy of the information intoxicated participants reported did not differ compared to sober participants, however, suggesting intoxicated participants were effectively monitoring the accuracy of their memory at test. Additionally, peripheral details were remembered less accurately than central details, regardless of the intoxication level; and memory accuracy for peripheral details decreased by a larger amount compared to central details across the retention interval. Finally, participants were more accurate if they were told they were drinking alcohol rather than a placebo. We discuss theoretical implications for alcohol myopia and memory regulation, together with applied implications for interviewing intoxicated witnesses.     

Alcohol myopia and condom use: can alcohol intoxication be associated with more prudent behavior?

We tested 2 competing theories about the effects of alcohol on intentions to engage in risky behavior. Disinhibition predicts that intoxicated people will exhibit risky behavior regardless of environmental cues, whereas alcohol myopia (C. M. Steele & R. A. Josephs, 1990) predicts that intoxicated people will be more or less likely to exhibit risky behavior, depending on the cues provided. In 4 studies, we found an interaction between intoxication and cue type. When impelling cues were present, intoxicated people reported greater intentions to have unprotected sex than did sober people. When subtle inhibiting cues were present, intoxicated and sober people reported equally cautious intentions (Studies 1-3). When strong inhibiting cues were present, intoxicated people reported more prudent intentions than did sober people (Study 4). We suggest that alcohol myopia provides a more comprehensive account of the effects of alcohol than does disinhibition.     

Instructional cues modify performance on the Iowa Gambling Task

The current study investigated whether acute alcohol intoxication produces impaired decision-making on tasks assessing ventromedial prefrontal (VMF) cortex functioning and impulsive responding. Participants completed the Iowa Gambling Task (IGT), a decision-making test targeting the VMF, and the Newman Perseveration Task (NT), a measure of impulsivity. Personality measures of impulsivity were assessed using the Barratt Impulsiveness Scale (BIS). To encourage natural responding on both tasks, participants were falsely informed that the study was examining the effects of alcohol on memory; the impulsivity tasks were presented as 'distractor' tasks. Advantageous performance on the IGT was related to specific instructional cues as well as to knowledge about the experimental purpose. Performance of intoxicated and sober participants did not differ. A subsequent study in which the true purpose of the experiment was revealed confirmed that alcohol does not affect IGT performance. Most importantly, the instruction-sensitivity of the IGT emphasizes the importance of salient cues for decision-making.     

Alcohol intoxicated witnesses' interpretation of social behavior in intimate partner violence

Alcohol intoxication affects social information processing, though research is scarce regarding how alcohol affected eyewitnesses' perception of social interaction within an applied forensic context. In the present study, the effects of alcohol intoxication on eyewitnesses' perception of interaction in intimate partner violence (IPV) were investigated. The participants (n = 152) were randomized to an experimental (alcohol) or control group (juice). After consumption, they viewed a filmed IPV scenario where both interacting parties were confrontational. Afterwards, they rated the involved parties' behavior. Several behaviors were perceived in a similar manner by intoxicated and sober participants, but intoxicated participants perceived both parties' attacking behaviors and some of the man's prosocial behaviors differently than sober participants. Hence, alcohol affected some, but not all, kinds of social behaviors investigated in the present study. This would be of interest to legal praxis and to future studies on intoxicated witnesses to interpersonal violence.     

Alcohol, sexual arousal, and intentions to use condoms in young men: applying alcohol myopia theory to risky sexual behavior.

Data from 7 studies were aggregated to examine how reported sexual arousal and alcohol intoxication interact to affect attitudes and intentions toward engaging in unprotected sexual intercourse in college-age men (N = 358). When participants were in a sober or placebo condition, their self-reports of sexual arousal had no effect on their responses. When participants were intoxicated, however, those who felt sexually aroused reported more favorable attitudes, thoughts, and intentions toward having unprotected sex than did those who did not feel aroused. These findings support alcohol myopia theory (C. M. Steele & R. A. Josephs, 1990), which states that alcohol intoxication restricts attentional capacity so that people are highly influenced by the most salient cues in their environment. It is suggested that sexual arousal is a powerful internal cue that interacts with alcohol intoxication to enhance attitudes and intentions toward risky sexual behaviors.     

State-dependent recall decrements with moderate doses of alcohol

Thirty-two adult volunteers were asked to memorize a simplified geographical map, visually displayed, together with an auditorially presented 19-item set of instructions regarding a particular route. During this session, half the subjects were sober and half were under the effects of a moderate dose of alcohol (mean blood alcohol concentration = 81mg/100ml). Twenty-four hours later they were tested under the same or different conditions. Learning performance on Day 1 was unaffected by alcohol. Learning transfer (tested on Day 2) was equally good when subjects were intoxicated during both sessions or were sober during both sessions. There were significant decrements in recall on Day 2, when subjects were in a different drug state. This ‘dissociation of learning’ was found to be symmetrical in that the recall decrement was the same whether the initial learning was acquired in a sober or a drugged state.     

Intact retention in acute alcohol amnesia

Research on alcohol amnesia has focused on memory processes that are disrupted during intoxication. The present experiment examined the possibility that certain memory processes might be resistant to the amnesic effects of alcohol. Intoxicated and sober subjects studied a list of 29 words. They were then given one of three different retention tests: free recall, identification of degraded words based on the procedure used by Warrington and Weiskrantz (1970), and yes/no recognition. As expected, free recall was significantly impaired by alcohol intoxication. In contrast, in the identification test, intoxicated subjects benefited to the same degree as sober subjects from prior exposure to the items. The two groups did not differ in immediate recognition memory. The results of the free-recall and identification tasks are similar to findings with chronic amnesic patients and suggest that perceptual fluency is not affected by alcohol, whereas elaborative processes supporting recall are particularly sensitive to disruption during intoxication. The failure to find recognition impairment at the level of intoxication used in this study distinguishes temporary alcohol amnesia from chronic amnesia.     

WOMEN'S RESPONSES TO UNWANTED SEXUAL ADVANCES: THE ROLE OF ALCOHOL AND INHIBITION CONFLICT

In this study we investigated how alcohol consumption affects women's responses to unwanted sexual advances in a hypothetical dating situation. Sixty female social drinkers participated in a 2 × 2 between-subjects experiment, which examined the effects of moderate alcohol intoxication and relationship characteristics on behavioral responses to unwanted sexual advances. Hypotheses were tested regarding the influence of inhibition conflict on intoxicated participants. As predicted, intoxicated women were more likely than sober women to consent to their dating partner's sexual advances in high conflict situations. Additionally, alcohol consumption increased women's estimated likelihood of responding passively. These findings aid in explicating the relationship between alcohol consumption and women's increased vulnerability to sexual assault.     

The neural correlates of alcohol-related aggression

Alcohol intoxication is implicated in approximately half of all violent crimes. Over the past several decades, numerous theories have been proposed to account for the influence of alcohol on aggression. Nearly all of these theories imply that altered functioning in the prefrontal cortex is a proximal cause. In the present functional magnetic resonance imaging (fMRI) experiment, 50 healthy young men consumed either a low dose of alcohol or a placebo and completed an aggression paradigm against provocative and nonprovocative opponents. Provocation did not affect neural responses. However, relative to sober participants, during acts of aggression, intoxicated participants showed decreased activity in the prefrontal cortex, caudate, and ventral striatum, but heightened activation in the hippocampus. Among intoxicated participants, but not among sober participants, aggressive behavior was positively correlated with activation in the medial and dorsolateral prefrontal cortex. These results support theories that posit a role for prefrontal cortical dysfunction as an important factor in intoxicated aggression.     

Does alcohol loosen the tongue? Intoxicated individuals' willingness to report transgressions or criminal behavior carried out by themselves or others

Police commonly interview intoxicated suspects. This is concerning when suspects are innocent because intoxication often leads to a higher risk for impulsive decision making and reduces inhibition. However, the manner in which intoxication affects people's reporting of unethical or criminal actions carried out by themselves or others is unknown and was thus addressed in the current study. Participants (N = 116) were randomly assigned to one of six conditions based on a 2 (transgression: self, other) × 3 (alcohol condition: low‐to‐moderate intoxication, placebo, sober‐control) between‐participants design. After drinking their assigned beverages, participants were asked to disclose a transgression. No main effect of alcohol emerged. However, the odds that participants would report a transgression were significantly higher if they were asked to report a personal, rather than someone else's, transgression. Overall, low‐to‐moderate intoxication did not increase the likelihood of sensitive information disclosure in this initial study, but additional research is needed.     

Alcohol Intoxication and Metamemory: Little Evidence that Moderate Intoxication Impairs Metacognitive Monitoring Processes

There is minimal research on metacognition in alcohol‐intoxicated participants. Study 1 examined metacognition across sober, intoxicated, and placebo groups, with the intoxicated group's breath alcohol concentration reaching 0.074 g/210 L on average immediately prior to the metacognition task. Participants answered cued recall general knowledge questions and provided confidence ratings and feeling‐of‐knowing judgments. They then completed a recognition (i.e., multiple choice) version of the same task, indicating an answer and a confidence rating for each question. Findings suggest that metacognitive accuracy generally did not vary across intoxication levels, although the control group's retrospective confidence judgments better discriminated between accurate and inaccurate responses than the alcohol groups in the recognition task. Study 2 surveyed academic psychologists about their expectations regarding the relation between alcohol and metacognition. Study 1's results were counter to their expectations, as respondents generally predicted a relation would be present. We discuss the implications for alcohol and memory.Copyright © 2017 John Wiley & Sons, Ltd.     

Effects of alcohol on the storage and retrieval processes of heavy social drinkers

Two experiments investigated the effects of intoxication, expectation of intoxication, and state dependency on learning and relearning in male heavy social drinkers. In both studies, subjects participated in two daily sessions. On Day 1, intoxicated and sober subjects were presented with word lists for immediate free recall, followed by total free recall of all words. On Day 2, with or without a change in drug state, subjects were given a second total recall test, the same lists for immediate recall, and a third total recall test. In Experiment 1, 10 subjects served in each of four groups formed by crossing expectation with reception of alcohol on Day 1; all subjects were sober on Day 2. In Experiment 2, 12 subjects served in each of four groups formed by crossing drug state on Day 1 with drug state on Day 2 (sober-sober, sober-intoxicated, intoxicated-intoxicated, intoxicated-sober), and all expected alcohol. In both studies, intoxication produced a performance deficit, but retention loss on Day 2 was the same for change- and constant-state subjects. Expectation had no effect on performance. Results are discussed in terms of an alcohol-induced storage deficiency rather than a retrieval deficit.     

Alcohol and unpleasant stimulation: subjective shock calibration and pain and discomfort perception

In an experiment 8 men participated in an alcohol and a sober condition in a rotated order. In both conditions subjects first calibrated a shock scale to a subjective criterion and then rated their subjective pain and total discomfort. Subjects calibrated the shock scale higher when intoxicated and rated the calibrated level equally painful in the sober and intoxicated conditions, but when intoxicated subjects actually rated the higher shock level as less uncomfortable. The shock scale was calibrated higher under intoxication not because subjects wanted to impress the experimenter but because less pain and discomfort was actually experienced.     

Encoding-imagery specificity in alcohol state-dependent learning.

A free-recall procedure demonstrated state-dependent learning using alcohol. Tests of long-term memory showed that both high- and low-imagery words were less likely to be recalled if stored while intoxicated rather than under sober conditions. However, information encoded and stored while intoxicated was more effectively retrieved when later tests of recall were performed while intoxicated, as compared to recall accomplished in the sober state. This dissociative recall effect was far more robust with low-imagery than with high-imagery words.     

The alcohol-aggression link: children's aggression expectancies in marital arguments as a function of the sobriety or intoxication of the arguing couple

Children's expectancies of man-woman and woman-man aggression during arguments between individuals who were either intoxicated or sober were examined. The role of child and familial characteristics in influencing these expectancies was assessed. We examined children's expectations of interadult verbal/psychological and physical aggression during simulated arguments presented to children on videotapes. A community sample (N = 156) of children and young adolescents (6-14-year olds) participated. Children expected higher levels of aggression during conflict when they thought that one or both participants in conflict were intoxicated versus sober. Further, higher levels of verbal versus physical interadult conflict were expected during the disputes. These findings build on the literature by demonstrating that elementary school age children and young adolescents exhibit expectancies that link the consumption of alcohol with increased verbal and physical aggression in marital arguments. These alcohol-aggression expectancies were robust and were evident in relation to either the man's or woman's perpetration of aggression against the spouse. Elucidation of factors that can influence associations between aggression and alcohol consumption are of importance and have broad implications for family functioning.