Biomedical subjects

K Mogg

Publications and source records attributed to K Mogg.

At least 19 recordsLinked to original sources

PubMed2004

Attentional and evaluative biases for smoking cues in nicotine dependence: component processes of biases in visual orienting.

The present study investigated attentional and evaluative biases for smoking-related cues in cigarette smokers and non-smokers. Using a visual probe task, we manipulated the presentation conditions of the stimuli to examine: (1). whether smokers have a bias to allocate attention towards smoking-related pictures that appear below the threshold of conscious awareness; and (2). whether attentional biases for smoking-related pictures that appear above the threshold of awareness operate both in initial orienting and in the maintenance of attention. We also obtained explicit and implicit measures of the valence of the smoking-related pictures from pleasantness ratings and from behavioural responses on a stimulus-response compatibility (SRC) task. Results showed that smokers, but not non-smokers, had an attentional bias for smoking-related pictures which had been presented at two exposure durations (200 and 2000 ms). The bias was not found in a brief (17 ms) masked exposure condition, so there was no evidence that it operated preconsciously. Smokers also showed greater preferences for smoking-related than control cues, compared with non-smokers, on both the explicit and implicit indices of stimulus valence. Results are discussed with reference to incentive and cognitive models of addiction.

Adolescent↗

PubMed2003

Attentional orienting towards smoking-related stimuli.

According to incentive salience theory, conditioned stimuli (CS+) associated with drug reinforcement acquire the capacity to elicit a conditioned attentional orienting response, which controls drug-seeking and drug-taking behaviour. We sought evidence for this proposal by measuring visual attentional orienting towards smoking pictures presented briefly in the periphery of the visual field, versus control pictures likewise presented, in smokers versus non-smokers. In each trial, smokers and non-smokers responded manually to a dot probe stimulus that appeared in a location previously occupied by either a smoking picture or a control picture. Attentional bias scores were calculated by subtracting the median reaction time (RT) in the former condition from the median RT in the latter condition. In two experiments, light-smokers (smokers of fewer than 20 cigarettes/day) produced a mean bias score that was significantly greater than that of heavy-smokers (smokers of 20 or more cigarettes/day) and non-smokers. In addition, when smokers from the two experiments were pooled, a significant quadratic relationship was found between cigarettes/day and the attentional bias for the smoking stimuli. These findings are consistent with incentive salience theories and dual-process theories of addiction.

Adolescent↗

PubMed2000

Attentional bias for drug cues in opiate dependence.

BACKGROUND: In a number of theories of compulsive drug use conditioned responses to stimuli associated with drug taking play a pivotal role. For example, according to incentive-sensitization theory (Robinson & Berridge, 1993), drug-related stimuli selectively capture attention, and the neural mechanisms underlying this attentional bias play a key role in the development and maintenance of drug dependence, and in relapse. However, there has been little work that assesses attentional biases in addiction. METHODS: We used a pictorial probe detection task to investigate whether there is an attentional bias to stimuli associated with drug use in opiate dependence. Stimuli presented included pairs of drug-related and matched neutral pictures. Methadone-maintained opiate addicts (N = 16) were compared with age-matched controls (N = 16). RESULTS: A mixed design analysis of variance of response times to probes revealed a significant three-way interaction of group x drug picture location x probe location. Opiate addicts had relatively faster reaction times to probes that replaced drug pictures rather than neutral pictures, consistent with the predicted attentional bias to drug-related stimuli. CONCLUSIONS: These results support the idea that an attentional bias for drug-related stimuli occurs in opiate dependence. This is consistent with the concept of a central role for such salient stimuli in compulsive drug use.

Adult↗

PubMed2000

Biases in eye movements to threatening facial expressions in generalized anxiety disorder and depressive disorder.

The study investigated biases in selective attention to emotional face stimuli in generalized anxiety disorder (GAD) and depressive disorder, using a modified probe detection task. There were 4 face types: threatening, sad, happy, and neutral. Measures of attentional bias included (a) the direction and latency of the initial eye movement in response to the faces and (b) manual reaction time (RT) to probes replacing the face stimuli 1,000 ms after their onset. Results showed that individuals with GAD (without depressive disorder) were more likely to look first toward threat faces rather than neutral faces compared with normal controls and those with depressive disorder. They also shifted their gaze more quickly toward threat faces, rather than away from them, relative to the other two groups. There were no significant findings from the manual RT data. Implications of the results for recent theories of clinical anxiety and depression are discussed.

Adult↗

PubMed1999

Some methodological issues in assessing attentional biases for threatening faces in anxiety: a replication study using a modified version of the probe detection task.

Various versions of the probe detection task have been developed to assess attentional biases in anxiety and there is debate about their relative merits in terms of reliability and sensitivity to such biases. The present study used a pictorial version of the probe detection task to examine attentional biases for emotional facial expressions. The main aims were (1) to see if our previous finding of greater vigilance for threatening faces in high than low trait anxiety could be replicated [Bradley, B. P., Mogg, K., Falla, S. J., & Hamilton, L. R. (1998). Attentional bias for threatening facial expressions in anxiety: manipulation of stimulus duration. Cognition and Emotion, in press] and (2) to examine whether the same pattern of results and a similar effect size, would be obtained using a 'probe position' task (i.e. where is the probe?), rather than the 'probe classification' task (i.e. what is the type of the probe?) used by Bradley et al. (1998). The probe position task produced similar results to those obtained from the probe classification task, so providing further evidence of an anxiety-related attentional bias for threatening faces. Results also indicated that, for non-clinical participants, the probe position task yielded faster overall RTs, fewer errors and a similar effect size, compared with the probe classification task. Implications for the assessment of attentional biases in non-clinical and clinical samples are discussed.

Adult↗

PubMed1999

Attentional bias for emotional faces in generalized anxiety disorder.

OBJECTIVES: Recent cognitive theories propose that attentional biases cause or maintain anxiety disorders. This study had several aims: (i) to investigate such biases in generalized anxiety disorder (GAD) using naturalistic, ecologically valid stimuli, namely, emotional facial expressions; (ii) to test the emotionality hypothesis by examining biases for happy as well as threat faces; and (iii) to assess the time course of the attentional bias. DESIGN: The dependent variable was an index of attentional bias derived from manual RTs to probe stimuli. There were four independent variables: one between-subjects variable of group (2: GAD, control), and three within-subjects variables: Type of emotional face (2: threat, happy), Stimulus duration (2: 500 ms, 1250 ms) and Half of task (2: first, second). METHOD: Attentional bias was assessed with a dot probe task. The stimuli comprised photographs of threatening, happy and neutral faces, presented using two exposure durations: 500 ms and 1250 ms. RESULTS: Anxious patients showed greater vigilance for threatening faces relative to neutral faces, compared with normal controls. This effect did not significantly vary as a function of stimulus duration. Anxious patients also showed enhanced vigilance for happy faces, but this was only significant in the second half of the task. CONCLUSIONS: The study confirmed not only that GAD patients show a bias in selective attention to threat, relative to controls, but also that this bias operates for naturalistic, non-verbal stimuli. As the attentional biases for threat and happy faces appeared to develop over a different time frame, different underlying mechanisms may be responsible.

Adult↗

PubMed1998

Selective attention to food-related stimuli in hunger: are attentional biases specific to emotional and psychopathological states, or are they also found in normal drive states?

Previous work has indicated that anxiety disorders and eating disorders are associated with selective processing of stimuli relevant to patients' concerns (e.g. Mathews and MacLeod, 1994; Annual Review of Psychology, 45, 25-50; Channon et al., 1988; British Journal of Clinical Psychology, 27, 259-260). A dot probe task was used to investigate whether attentional biases are also a feature of a normal drive state. Specifically, we examined whether hunger is associated with biases in selective attention and in pre-attentive processes for food-relevant stimuli. Subjects with high levels of hunger showed a greater attentional bias for food-related words presented in a suprathreshold exposure condition (words shown for 500 msec), in comparison with those with low hunger. There was no evidence in the present study of a hunger-related bias in pre-attentive processes (i.e. when words were shown for 14 msec and masked). Results suggest that a non-emotional motivational state, such as hunger, is associated with a bias in certain aspects of information processing, such as selective attention, for stimuli that are relevant to the motivational state. Findings are discussed in relation to recent research into emotion-related cognitive biases.

Adult↗

PubMed1998

A cognitive-motivational analysis of anxiety.

Evidence of preattentive and attentional biases in anxiety is evaluated from a cognitive-motivational perspective. According to this analysis, vulnerability to anxiety stems mainly from a lower threshold for appraising threat, rather than a bias in the direction of attention deployment. Thus, relatively innocuous stimuli are evaluated as having higher subjective threat value by high than low trait anxious individuals, and it is further assumed that everyone orients to stimuli that are judged to be significantly threatening. This account is contrasted with other recent cognitive models of anxiety, and implications for the etiology, maintenance and treatment of anxiety disorders are discussed.

Animals↗

PubMed1997

Time course of attentional bias for threat information in non-clinical anxiety.

A modified version of the probe detection task was used to investigate the effect of stimulus exposure duration on attentional bias for threat stimuli in a non-clinical sample of subjects. Stimulus duration was manipulated in order to examine different components of the anxiety-related attentional bias, i.e. initial orienting versus maintenance of attention to threat. Word pairs were presented on a computer screen for 100, 500 or 1,500 msec, and immediately after the termination of the display of each pair, a dot probe appeared in the position of one of the words. Higher levels of state anxiety were associated with faster response latencies for probes that replaced threat words, rather than neutral words (i.e. attentional vigilance for threat). This bias was not significantly affected by the exposure duration of the word stimuli. Thus, the attentional bias for threat does not appear to vary significantly over this range (100-1,500 msec) in non-clinical anxiety; it is recommended that the time course of the attentional bias be investigated further in clinical anxiety.

Adult↗

PubMed1997

Attentional biases for negative information in induced and naturally occurring dysphoria.

Two studies investigated the relationship between attentional biases for negative information and dysphoria--both induced (Study 1) and naturally occurring (Study 2). In a modified dot probe task a series of word pairs was presented, and Ss responded to probes that replaced one of the words in each pair. The stimuli included depression-related, anxiety-related and neutral words. To examine the time course of the attentional biases, there were three exposure durations of the word pairs: 14 ms (+ 186 ms mask); 500 ms and 1000 ms. In Study 1, the depressed mood induction procedure was associated with greater vigilance for depression-related words at 500 ms, with a similar trend at 1000 ms. In Study 2, measures of depressed mood and vulnerability correlated positively with vigilance for negative words in the 1000 ms condition. There was no evidence from either study that depressed mood was associated with a pre-conscious bias for negative words (i.e. in the 14 ms masked exposure condition). However, this pre-conscious bias was associated with high trait anxiety in Study 2, consistent with previous research. The results are discussed in relation to theoretical and empirical work on cognitive biases in clinical and non-clinical anxiety and depression.

Adult↗

PubMed1995

Effect of psychological treatment on cognitive bias in generalized anxiety disorder.

Measures of attention and implicit memory for threatening words were obtained from anxious patients before and after psychological treatment, and compared with data from non-anxious control Ss collected over the same period. Findings confirmed the expectation that the presence of threatening distractors would be associated with greater interference with the performance of anxious patients than with that of controls, in both color-naming and attentional search tasks, but failed to confirm the previous finding of related differences in priming on a word completion task. Treatment significantly reduced selective interference effects in anxious patients, and abolished evidence of differences between the treated patients and controls. It is suggested that cognitive bias effects in anxiety may either depend on state factors alone, or may represent a more enduring individual difference that becomes apparent only when vulnerable individuals are primed by mood state or stressful events.

Adult↗

PubMed1995

Implicit and explicit memory for emotion-congruent information in clinical depression and anxiety.

Implicit and explicit memory biases were assessed in clinically depressed (n = 19), clinically anxious (n = 17), and normal control (n = 18) Ss. The implicit memory test was a primed lexical decision task, with anxiety- and depression-relevant words, and suprathreshold and subthreshold primes. The explicit memory test was incidental free recall of self-referenced words. The depressed group showed greater suprathreshold and subthreshold priming effects for depression words, and recalled more depression words, than the other two groups. These results suggest that clinical depression, but not clinical anxiety, is associated with mood-congruent biases in both automatic and strategic memory processes.

Adolescent↗

PubMed1995

A follow-up study of cognitive bias in generalized anxiety disorder.

Patients with generalized anxiety disorder (GAD) without concurrent depression (n = 11) and normal controls (n = 17) were tested twice, about 2 months apart, on a modified Stroop colour-naming task, which presented anxiety-related, depression-related and neutral words in masked and unmasked exposure conditions. GAD patients received cognitive behaviour therapy in the test-retest interval, and were also retested at follow-up, about 20 months after initial testing. GAD patients showed interference in colour-naming negative words across both masked and unmasked conditions before treatment, but not post-treatment, compared with controls. Reduced interference effects of masked threat words over time correlated with reduced ratings of anxious thoughts at post-treatment, and at follow-up, in GAD patients. Thus, the preconscious bias for threat information in GAD appears to vary over time in association with changes in anxious thoughts and worries.

Adolescent↗

PubMed1995

Selective processing of negative information: effects of clinical anxiety, concurrent depression, and awareness.

Anxious patients (n = 20) and normal controls (n = 20) carried out a modified Stroop color-naming task with anxiety- and depression-related words in supraliminal and subliminal exposure conditions. Within the anxious group, patients with generalized anxiety disorder (GAD) without concurrent depression (n = 11) showed more color-naming interference for anxiety words than neutral words in comparison with patients with a combined diagnosis of GAD and depression (n = 9). Compared with controls, the GAD subgroup without concurrent depression showed slower color naming for negative than neutral words, in both supraliminal and subliminal conditions, replicating K. Mogg, B. P. Bradley, R. Williams, and A. Mathews's (1993) results. These findings provide further evidence of an anxiety-related bias for negative information in preconscious processes and highlight the importance of assessing concurrent depression.

Adolescent↗

PubMed1995

Attentional bias in anxiety and depression: the role of awareness.

Attentional biases were assessed with a probe detection task in anxious (N = 17), depressed (N = 17) and normal control (N = 15) subjects. Word pairs were presented visually, with a dot probe following one word of each pair. Allocation of attention to the spatial position of the words was determined from response latencies to the probes. Half the word pairs were presented supraliminally, half subliminally. The anxious and depressed groups showed an attentional bias towards supraliminal negative words, in comparison with normal controls. The depressed group unexpectedly showed greater vigilance for supraliminal anxiety-relevant words than the anxious group. The anxious group shifted their attention towards the spatial location of negative words presented subliminally. The results support the hypothesis of an anxiety-related bias in preconscious processes.

Adolescent↗

PubMed1994

Implicit and explicit memory for emotional information in non-clinical subjects.

The study investigated implicit and explicit memory for emotional words in 53 non-clinical Ss. The implicit memory test was a primed lexical decision task, which included anxiety- and depression-relevant words, and supraliminal and subliminal priming conditions. The explicit memory test was incidental free recall following a self-referent encoding task. Subjects were divided into high and low negative affect groups, differing in trait and state anxiety, and depression scores. The high negative affect group showed greater subliminal priming of depression-relevant than neutral control words compared with the low negative affect group. This selective priming effect was more closely associated with depression than anxiety measures. There was little direct evidence of emotion-congruent biases on the supraliminally primed lexical decision and free recall tasks, although when the effects of anxiety were partialled out depression scores predicted relatively better recall of depression-relevant words. In conclusion, the main results that non-clinical depression is associated with a mood-congruent bias in automatic aspects of implicit memory.

Adult↗

PubMed1994

Mood and personality in recall of positive and negative information.

The present study examined the relationships between a number of personality and mood indices, and memory bias. Results suggested that Neuroticism scores were associated with negative recall but this effect depended on current level of dysphoria. Across the sample as a whole, negative recall bias appeared to be associated with general negative affect. When the sample was divided into high and low dysphoric groups, Neuroticism predicted increased negative recall only in the high dysphoria group. These results suggest that the tendency to recall negative information may be an interactive function of depressed mood and vulnerable personality.

Adult↗

PubMed1994

Attentional bias to threat: roles of trait anxiety, stressful events, and awareness.

Attentional biases for threat stimuli were assessed in high and low trait anxious subjects (n = 66) using a probe detection task. To examine the effects of trait anxiety and situational stressors, each subject was tested three times: Under no stress, laboratory-induced stress, and examination-induced stress. To evaluate the role of awareness, half the word stimuli were presented very briefly (14 msec) and masked, and the other half were presented for 500 msec without a mask. Results showed that high trait anxious subjects under exam stress showed an attentional bias towards unmasked threat stimuli compared with low trait subjects. This effect was not found under lab-induced stress, suggesting that the attentional bias for unmasked threat in high trait subjects may be a function of a prolonged stressor, rather than a transient increase in state anxiety. The results from the masked exposure condition were not predicted; high trait anxious subjects shifted attention towards the spatial location of threat words despite lack of awareness of their lexical content, but this bias was only apparent in the no-stress condition. The results are discussed in relation to recent cognitive theories of anxiety.

Anxiety↗