Introduction
Mental imagery (MI) is an essential part of human thinking (Clifton et al.,
1991; McCarthy et al.,
2001; Piaget,
1974) and is closely associated with emotions; negative feelings like sadness, anger, shame, disgust and fear, but also pleasant ones like joy (e.g., Blackwell,
2019; Holmes & Matthews,
2010). Especially when experiencing intensive feelings, information processing may be characterized more by MI than by logical-rational cognitive processing (Gadeikis et al.,
2017; Seebauer et al.,
2016), and might stimulate physiological responses that are often beyond conscious control (Papadelis et al.,
2007). Mental images are often based on memories, but may also refer to a future event (Hales et al.,
2011). For example, thinking about a future moment of glory is associated with positive emotions. This can be useful and relaxing, but MI may also be associated with intensive strain and negative feelings if people think about unpleasant events. Having intrusive images about a traumatic event, so called “flashbacks” is also a symptom for posttraumatic stress disorder (PTSD; Holmes & Matthews,
2010). But mental images do not only occur in PTSD. The potentially important role of negative MI as a maintenance factor of psychological disorders has been supported in studies with adults suffering from PTSD (e.g., Cockerham et al.,
2016), obsessive-compulsive disorder (OCD; e.g., Speckens et al.
2007), social anxiety disorder (SAD, e.g., Hackmann et al.,
2000), agoraphobia (Day et al.,
2004), body dysmorphic disorders (Ritter & Stangier,
2016), and depression (e.g., Weßlau & Steil,
2014). Many mental health problems have their onset in adolescence (Paus et al.,
2008). It therefore makes sense to examine the mental images in this age group as well. For adolescents, however, the study situation is significantly worse than for adults, and basic research on the underlying mechanisms of the associations between MI and emotions is almost completely lacking.
Schwarz et al. (
2020) state in their comprehensive review, that MI seems to contribute to the maintenance of social anxiety disorder and depression. In addition, they showed, that if adapted to the developmental stages of children, interventions targeting MI (like imagery rescripting) are effective in the treatment of mental disorders. Consequently, MI appears to be a relevant factor for mental disorders in children and adolescents (Schwarz et al.,
2020). To treat these disorders with these methods in an effective and efficient way, it is important to understand the processes leading to such emotional dysfunctions and intrusive mental images (Holmes & Matthews,
2010).
So far, neither a study exploring imagery content, nor the differences in associated emotions between contents and characteristics of MI in healthy adolescents (or adults), could be found. Therefore, this present investigation is part of the fundamental research on the association between mental images and emotions. Besides the content of MI, different characteristics like the perspective from which the image is perceived, vividness, frequency and subjectively perceived controllability might also be linked to emotional distress and emotions. The current state of research on these associations are described in the following section.
Material and Methods
We present data from an anonymous web-based study examining N = 80 adolescents, aged 14 to 20 years. The assessment was conducted using unipark (QuestBack GmbH, Germany), an online survey software program. Participants were asked to generate two self-selected spontaneous images, a positive and a negative one. Afterwards they were requested to describe what they experienced in every sensory quality (visual, auditory, gustatory and olfactory properties, physical sensations and tactile impressions), the intensity of emotions (joy, fear, anger, sadness, disgust, shame, feelings of guilt), as well as the vividness and imagery perspective of the two images. They also had to complete questionnaires about depressive and social anxiety symptoms. Participants specified whether or not their parents had agreed to the participation. Data obtained without parental consent was deleted. Permission from an ethics committee was obtained prior to the start of the study.
Methods
To identify themes and investigate whether or not the content was linked to different levels of associated emotions, a qualitative analysis was conducted prior the quantitative analysis. The different descriptions of the participants were divided into superordinate categories according to Mayring (
2016), based on an inductive procedure. The two superordinate categories for positive images were
social reward and
physical reward. For negative images, the two superordinate categories were
physical threat and
interpersonal threat. Participants’ responses were therefore screened according to whether they included social/interpersonal or physical issues. The answers were then assigned to two superordinate categories and afterwards divided into subcategories based on a deductive procedure. The answers of participants were later coded by naive raters into one of the categories. We found an excellent interrater reliability for positive images (Cohens-
kappa = 0.948) and negative images (Cohens-
kappa = 0.929).
Five categories for positive images (social reward:
enjoying time with family or friends, romantic situations; physical reward:
enjoying nature, practicing sports) and seven categories for negative images (interpersonal threat:
conflicts with friends/family, death of a close relative, loneliness, failure in a performance situation, social embarrassment; physical threat:
unintended/accidental physical injury of oneself; physical harm of another person) were identified (see Tables
1 and
2). A one-sample
\({\chi }^{2}\)-test was conducted to examine whether mental images with social themes (social reward for positive MI and interpersonal conflicts for negative MI) were mentioned significantly more often than mental images with a physical theme (physical reward and threat).
As depressive- and social anxiety symptoms might affect the relationship between characteristics of MI and associated emotions (e.g., Meiser-Stedman et al.,
2012; Schreiber & Steil,
2013) and our sample scores regarding those symptoms, depression (BDI-scores) and social anxiety scores (SPIN-scores) were included as covariates in subsequent comparisons between the different images. To answer the question of which theme in positive images was associated with higher levels of joy, we first conducted an ANCOVA with the two
superordinate categories (social and physical reward) as independent variables and associated
joy as dependent variable. We then conducted one more ANCOVA with the different
subcategories (four categories) as independent variables and
joy as dependent variable, to compare the subcategories more specifically. To test which theme of negative images was associated with high levels of negative emotions, we constructed a
mean which consisted of all ratings for negative emotions (anxiety, sadness, anger, disgust, shame, feelings of guilt). A MANCOVA with the two superordinate categories (physical/interpersonal threat) as independent variables and
emotional distress and the calculated
mean negative emotions as dependent variables was conducted to examine the difference between these two categories. We also conducted a MANCOVA with the different
subcategories as independent variables, and
distress and the calculated
mean negative emotions as dependent variables, in order to examine differences between the seven subcategories.
In order to test the differences in emotional distress and mean of negative emotions between different types of perspective (field perspective, observer perspective, combination of field and observer perspective), we conducted a MANCOVA with perspective as the independent variable and emotional distress and mean of negative emotions as the dependent variables for negative images. Because it is assumed that an observer perspective is part of cognitive avoidance, we hypothesized that especially a high score for anxiety would be reported among participants experiencing the image in an observer perspective. To test this hypothesis, we conducted an ANCOVA, with perspective as the independent variable and anxiety as the dependent variable for negative images. For positive images, we conducted an ANCOVA with perspective as the independent variable and joy as the dependent variable. The association between frequency (scale from 1 = almost never to 5 = always), vividness (scale from 1 = no image at all to 5 = as vivid as real life) and controllability (scale from 0 = no control to 10 = full control) and reported joy (for positive images) as well as emotional distress, anxiety, anger, sadness, disgust, shame and guilt (for negative images) were investigated with correlation analysis.
Each statistical calculation was conducted twice, once for positive images and once for negative images. For the statistical analysis of positive images, we used all those who reported having positive images (n = 76), and for the statistical analysis of negative images, we used all adolescents who reported having negative images (n = 67).
Results
Positive Mental Imagery
Table 1
Content of positive mental imagery in youths
Social reward
| 47 (58.75%) | 7.60 (2.08) |
Enjoying time with family or friends (e.g. “it’s Christmas eve and I’m playing ball with my grandpa”) | 31 | 7.77 (1.96) |
Romantic situation (e.g. “kissing my girlfriend, smelling her perfume and feeling her lips”) | 16 | 7.31 (2.39) |
Physical reward
| 29 (36.25%) | 7.64 (1.81) |
Enjoying nature (e.g. “walking through the forest in good weather and enjoy the fresh air”) | 21 | 7.33 (1.62) |
Practicing sports (e.g. “being on a horse farm and taking care of my favorite pony”) | 8 | 8.38 (2.07) |
No image
| 4 (5%) | |
An ANCOVA with BDI- and SPIN-scores as covariates was conducted to examine the difference between the two superordinate categories (as independent variables) on the dependent variable joy. No significant difference between physical reward and social reward was found (F(1,73) 0.009; p = .926; η2 = 0.000). One more ANCOVA was conducted to test the differences between subcategories (four subcategories) as independent variables on joy as the dependent variable. No significant main effect of content (F(3, 70) 0.876; p = .458; η2 = 0.036) was found for joy.
Negative Mental Imagery
Table 2
Content of negative mental imagery in youths
Interpersonal threat
| 42 (52.5%) | 8.12 (1.86) | 4.77 (1.72) |
Conflicts with friends/family (e.g. “crying at my desk, reading an awful message from my boyfriend”) | 17 | 8.82 (1.29)* | 4.98 (1.97) |
Loneliness (e.g. “being alone, not being able to speak”) | 7 | 7.86 (1.22) | 4.85 (2.22) |
Social embarrassment (e.g. “pupils making fun of me, insulting me, laughing at me) | 11 | 8.64 (1.29)* | 4.92 (1.12) |
Failure in a performance situation (e.g. “sitting in my final exams, forgot everything I’ve learned”) | 7 | 5.86 (2.67)* | 3.92 (1.35) |
Physical threat
| 25 (31.25%) | 8.36 (1.68) | 4.31 (1.64) |
Physical harm to another person (e.g. “a friend of mine falls down the stairs at school, hearing his crying and falling sounds”) | 9 | 8.73 (2.28) | 5.09 (2.01) |
Death of someone I care about (e.g. “seeing my grandpa lying in a coffin”) | 11 | 8.45 (1.13)* | 3.95 (1.14) |
Accidental/unintended physical injury of oneself (e.g. “getting a door smashed into my face, feeling blood running down my face”) | 5 | 7.67 (1.37) | 3.67 (1.62) |
No image
| 13 (16.25%) | | |
A MANCOVA with BDI- and SPIN-scores as covariates was conducted to examine the difference in reported emotional distress and mean negative emotions between the two superordinate categories. No significant main effect of superordinate categories was found (Wilksλ 0.95; F(2,62) 1.82; p = .171; η2 = 0.055). To examine the differences between the seven subcategories in reported emotional distress and the mean negative emotions as independent variables, one more MANCOVA was conducted. A significant main effect of subcategories (Wilksλ 0.68; F(12,114) 2.07; p = .025; η2 = 0.179) was discovered for distress and negative emotions. This main effect could be traced back specifically to significant differences in the dependent variable distress (F(6, 66) 2.83; p = .017; η2 = 0.223) between failure in a performance situation and each of the following: conflicts with friends/family (Mdifference 2.97, SE 0.74; p = .003); social embarrassment (Mdifference 2.78, SE 0.79; p = .018) and death of someone I care about (Mdifference 2.60, SE 0.79; p = .037).
Table 3
Significant correlations between characteristics of negative MI and associated emotions
Emotional Distress | 0.66 | 0.001* | 0.82 | 0.001* | − 0.53 | 0.001* |
Emotions | | | | | | |
anxiety | 0.69 | 0.001* | 0.69 | 0.001* | − 0.53 | 0.001* |
sadness | 0.48 | 0.001* | 0.59 | 0.001* | − 0.44 | 0.001* |
anger | 0.34 | 0.002 | 0.52 | 0.001* | − 0.31 | 0.006 |
disgust | | | 0.38 | 0.001 | | |
guilt | 0.48 | 0.001* | 0.41 | 0.001* | − 0.30 | 0.008 |
shame | 0.41 | 0.001* | 0.32 | 0.004 | − 0.25 | 0.027 |
A higher frequency was therefore associated with higher levels of distress, anxiety, sadness, guilt, shame and anger. Experiencing a negative image as more vivid was associated with a higher score for emotional distress, anxiety, sadness, anger, guilt, disgust and shame. Less control over negative images is associated with higher levels of distress, anxiety, sadness, guilt, anger and shame.
Discussion
The aim of this study was to identify content of spontaneous positive and negative MI in adolescents, and to investigate content and characteristics of MI and their link to associated emotions and distress. The qualitative analysis revealed two superordinate categories for positive images (social reward and physical reward) and two superordinate categories for negative images (physical threat and interpersonal threat). Five categories for positive images (social reward: enjoying time with family or friends, romantic situations; physical reward: enjoying nature, practicing sports) and seven categories for negative images (interpersonal threat: conflicts with friends/family, death of a close relative, loneliness, failure in a performance situation, social embarrassment; physical threat: unintended/accidental physical injury of oneself; physical harm of another person) were identified.
Participants reported positive and negative images significantly more often about social themes. One explanation could be that puberty is a phase in which acceptance of one’s preferred peer group is more important than in other phases (Blakemore & Choudhury,
2006; Lynn Mulvey et al.,
2017; Sebastian et al.,
2011). Our findings support this hypothesis, as it seems that social situations during this phase are particularly popular. The study also confirms the relevance of social contacts for young people. Therefore, adolescence should be given the opportunity to have many positive social experiences, whether at school or in their free time. In therapy of anxiety disorders, for instance, patients are advised to imagine a safe-place or situation in which to relax (Williams & Poijula,
2016). For adolescence, it might be more suitable and easier to imagine a pleasant social situation.
Furthermore, images about practicing sport or enjoying nature were also reported as positive images. Our finding indicates that engaging in sport is considered as pleasant, even when only thinking about oneself doing so. Success and achievements in school, as well as praise from teachers or parents were not mentioned. This might indicate for teachers and parents, that positive reinforcement should be more often part of every educational method.
We additionally expected a difference in emotional distress and associated emotions between contents for positive and for negative MI. Significant differences were found for associated distress, but not for associated negative emotions. Participants who report having images about
failure in a performance situation also report low levels of distress.
Conflicts with family or friends, physical harm of another person and
social embarrassment are themes which were associated with higher levels for distress than performance in school. The low level of emotional distress might be an explanation for motivational problems in school among adolescence (Rosenbaum,
1991). For positive images, we did not find such differences in associated joy, neither between superordinate nor sub-categories. It seems to be less important what a positive mental image is about, as long as the image is vivid, frequent and controllable.
Furthermore, we investigated the link between various characteristics of MI and the associated emotions. Regarding the use of perspective, we assumed a higher level of joy for field-perspective. As no significant differences in reported joy occurred between the perspective options in positive images, this hypothesis was not confirmed by our results. Maybe the effect was too small to be revealed with such a small number of participants. Furthermore, we hypothesized that adolescents reporting a frequent use of field perspective in negative images would also report a higher score for anxiety. Perceiving an image from a combination of both perspectives was associated with higher levels of anxiety than experiencing an image from an observer perspective only. This partially supports previous findings, indicating that field perspective is associated with higher levels of emotions and distress (Holmes et al.,
2008; Vella & Moulds,
2013; Williams & Moulds,
2007), as those studies did not ask for the combination of both perspectives. We assumed that participants who experience images from an observer perspective report lower levels of anxiety, as this perspective is typically used by patients with SAD (e.g., Schreiber & Steil,
2013) or PTSD (e.g., McIsaac & Eich,
2004), and they tend to avoid anxiety. Our finding supports the assumption that the use of the observer perspective is part of an avoidance technique (Kenny & Bryant,
2007) and thus needs to be noted and prevented by therapists, for example while using exposition in sensu. Investigating the use of the combination of field- and observer perspective and its association with emotions in an experimental design is indispensable as our study is the first asking for the use of a combination of perspectives.
Regarding frequency, more frequent positive MI was linked to a higher score of joy (moderate correlations), which supports to encourage adolescence to have positive mental images often. More frequent negative images were linked to higher distress and higher negative emotions, especially anxiety. Therefore, a habituation effect does not seem to exist in this sample.
Furthermore, we assumed that the vividness of positive and negative MI correlates positively with higher levels of emotional distress and the associated emotions. This statement can be confirmed, as higher vividness was linked to a higher score for joy (high correlation). Trying to imagine a positive image in each sensory modality seems to be important to increase joy and should be encouraged by therapists when using positive MI e.g. in relaxation exercises. For negative images, we found significant high correlations between vividness and reported distress, anxiety, sadness and anger. Vividness seems to be an important factor mediating the effect of MI on emotions, and therefore needs to be considered when dealing with MI in both the research and therapy contexts.
Regarding the effect of controllability, we found a large positive correlation between controllability and joy in positive images. Having control over the image seems to be good in positive images, as a higher score of joy was associated. In negative images, we found large negative correlations between controllability and distress and anxiety. Therefore, a training to increase control over MI might be useful in order to increase mental health as positive emotions might occur more often and more intense. Such a training might consequently help to prevent the development of mental disorders and also to treat these disorders. Techniques which probably improve control over MI in children and adolescents include imagery rescripting, emotive imagery, imagery-rehearsal therapy (for detailed review of these techniques see Schwarz et al.,
2020). To what extent these methods lead to increased control still needs to be examined.
Limitations
This study has several limitations. First, the sample size is rather small, especially for investigating so many different contents of MI. While the interview has been widely used in adults and has shown to be a valid instrument, the validity of our measure for youths is questionable and complicate the potential for generalization. A validation of the MIQ-Y could also not be done due to the small sample size. The group size for each individual content is particularly small and generalization is therefore limited. Furthermore, nothing can be said about the causality of the relationship between emotions and characteristics of mental images, as we used a cross-sectional design in this study. Although many participants (one-fifth of the sample) have a high score in the depression and social anxiety questionnaire, there is only limited applicability and generalizability of any conclusions drawn to clinical samples, as there were no external clinical assessments and no detailed diagnostic face-to-face interviews (and therefore no diagnosis can be made), As we only used self-report measures there is a lack of verifiability of the objectivity.
Our sample has a relatively high social status and education, as more than one-third attend university. As most of the participants, which started the web-based design, dropped out after the MiQ-Y, the questions may have been too conceptual for some of the adolescents, explaining the high educational status of our final sample. The responses of the participants in this study, who completed the whole survey, did not indicate that they had trouble understanding any questions, although the MIQ-Y was developed based on a semi-structured interview (Hackmann et al.,
2000) and not based on a questionnaire. Although we gathered pilot data, the use of questionnaires (and not face-to-face interviews) might not be suitable for measuring such a complicated and non-figurative construct, as mental imagery and questions may have been understood differently by respondents in terms of language (e.g., unsuitable wording, Campbell and Rapee,
1996) or lack of adequate reading ability (Vasey et al.,
2003). Youths might have more problems reporting emotions, cognitions and other mental processes compared to adults, as they might have a less pronounced self-awareness. Furthermore, there are several limitations due to the fact that the data are from an online survey. Certain age and social groups are more likely to take part in such surveys. For example, participants with a lower level of education might not respond (Blasius & Brandt,
2009), which might be also an explanation for the high social status in our sample. We also cannot ensure that the information given on age or gender, for example, is true. To guarantee that a participant only completed the survey only one time, every IP-address only could participate once. However, we still cannot definitely ensure that participants completed the survey a second time. Furthermore, we could not control current mood or any kind of environmental emotional priming effects such as actual experience of e.g. a fight with friends, right before our survey. Because of its exploratory nature, this study could be a preliminary study to an experimental study where participants could be asked to generate a standardized mental image and then evaluate the emotions.
Conclusion
Despite these limitations, our study is among the first to identify themes of positive and negative MI and to investigate the association between themes and characteristics of MI with emotional distress and emotions in adolescents. Most adolescents reported having images about social themes and adolescents having images about social conflicts reported higher levels of emotional distress than adolescents having MI about failure in a performance situation. This indicates and emphasizes that adolescence is a phase in life where social contacts are especially important. To increase joy, positive MI should be vivid, frequent and controllable. Techniques which might lead to an increased control over MI need to be examined.
In negative images, a higher frequency and vividness as well as less control over negative images was associated with higher levels of especially emotional distress and anxiety and perceiving an image from a combination of both perspectives was associated with a higher score of anxiety. These characteristics should be considered by therapists while addressing MI and especially perspective should be kept in mind while using exposition in sensu. As this is the first study dealing with the combination of perspectives, the results raise questions about previous results comparing each perspective individually.
When working with adolescents in school, therapy or leisure, encouraging adolescents to use their imagination and to generate a vivid positive image and practice to gain control with suitable methods over positive and negative MI, may have a beneficial effect on associated emotions and may therefore also promote mental health. To ensure that these findings are indeed particularly relevant for adolescents, replications in adults and children are needed. Thus, replications with a larger sample size and clinical adolescent samples are needed, as well as longitudinal assessments of MI, to deal satisfactorily with causal issues. The present pilot study also creates an opening point for upcoming investigations of the association between content and characteristics of MI and emotions.
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