Abstract
In this review, we discuss major measurement and methodological challenges to studying self-talk. We review the assessment of self-talk frequency, studying self-talk in its natural context, personal pronoun usage within self-talk, experiential sampling methods, and the experimental manipulation of self-talk. We highlight new possible research opportunities and discuss recent advances such as brain imaging studies of self-talk, the use of self-talk by robots, and measurement of self-talk in aphasic patients.
Introduction
In this paper we synthesize past and current research findings pertaining to the phenomenon of self-talk, the activity of talking to oneself out loud or in silence (). The latter is usually called inner speech, which can be defined as “inner language in the absence of overt and audible articulation” (, p. 2). We include in this definition various related constructs such as internal monologue (talking to oneself as one person) or dialogue (having a back-and-forth conversation with oneself), private speech, and self-statements (, ). Self-talk has a long history of theoretical and empirical work (see ; ; ). There is a great deal of work pertaining to the development, cognitive functions, phenomenology, and neurobiology of self-talk (e.g., ; ). In recent years, the study of self-talk has been steadily progressing: found 559 articles published between 1978 and 2020 that specifically mentioned “self-talk.”
This large body of work allows for the identification of the main functions of self-talk. These include thinking, problem solving, self-regulation, self-reflection, working memory, task switching, language, rehearsal and replay, emotional expression, thinking about others’ mental states, and self-rumination (see , Table 9.1). The array of functions served by self-talk, coupled with the finding that it is present in a significant portion of sampled conscious experiences (), makes it clear that self-talk represents a crucial mental activity.
In this review, we discuss some of the major challenges of studying self-talk, including measurement issues and attempts at assessing self-talk frequency, distinguishing self-talk from other common inner experiences, the study of self-talk in its natural context, and the experimental manipulation of self-talk. We also examine research opportunities and recent advances such as the use of thought sampling procedures to assess self-talk, brain imaging studies of different types and formats of self-talk, the use of self-talk by robots to increase trust during human-robot interactions, and measurement of self-talk in aphasic patients.
Measurement challenges and opportunities
In our chapter on self-talk assessment in sport (; see Table 3.2), we discuss the main advantages and limitations of most existing self-talk measures (also see , Table 9.2). Commonly used self-talk measures include (1) self-report inventories such as the Self-Talk Scale (STS; ) and the Varieties of Inner Speech Questionnaire—Revised (VISQ-R; ); Descriptive Experiential Sampling (DES) (e.g., ); recordings of brain activity (e.g., ); think aloud (e.g., ) and thought listing (e.g., ) protocols; and observer recordings of self-talk manifestations (e.g., ; ; Winsler, 2009). Less traditional approaches include videotape reconstruction (e.g., ), one-on-one interviews (e.g., ), and various experimental methods designed to interfere with self-talk or show self-talk deficits (e.g., ; ; ).
Each method has its strengths and weaknesses. For example, thought listing, interviews, and self-talk recordings are best suited for assessing self-talk content, whereas observer reports and recordings of brain activity tap into the frequency/occurrence of self-talk. The DES approach, recordings of ongoing private speech, and videotape reconstruction offer greater ecological validity compared to interviews or self-report questionnaires. Methods that interfere experimentally with the self-talk process can have more direct control over the nature and content of self-talk compared to thought listing or self-report questionnaires. Self-report methods are easy to use, whereas DES and brain imaging require significantly more time and effort. For more detailed reviews of reliability and validity issues with self-talk measures, see and .
We note two key observations from our review of self-talk measures. First, assessing self-talk in situ is difficult—one can adopt methods like private speech recording and DES, but these are either prone to multiple biases (which can affect validity) or are complicated to implement. Second, researchers often must rely on retrospective self-talk descriptions: as soon as a self-report becomes retrospective (even in the short term), it becomes potentially inaccurate because of possible memory biases. There is debate over whether self-report measures inflate actual frequencies of self-talk, as suggested by . Issues with self-report questionnaires, which might possibly bias results pertaining to frequency, include individual differences in interpretating Likert scales (e.g., what does it mean to talk to oneself “rarely” or “often”?) and vagueness or complexity of items (e.g., from the VISQ-R: “When I am talking to myself about things in my mind, it is like I am having a conversation with myself”).
Methodological challenges and opportunities
There are multiple methodological challenges in self-talk research. Studying the phenomenon in its natural context frequently requires disrupting the flow of the self-talk. For example, self-talk may be “automatic” and outside of our awareness (e.g., ), making it difficult to study in situ. Research shows that creating specific self-talk cues or prompts can be effective when learning to meet specific performance goals (e.g., ). However, there are potential problems with asking people to recite researcher-determined self-talk and studying its resulting effects. First, such content might not occur naturally in the course of a person’s customary self-talk patterns. Second, the unique nature or style with which people talk to themselves might differ from researcher-provided cue or prompts. In response to these challenges, researchers have developed innovative ways to examine the nature, frequency, and content of self-talk.
One research approach tries to study ongoing (or nearly concurrent) instances of self-talk using experience sampling methods (ESM). Participants typically receive a series of random signals (e.g., via phone or some other device) during their regular daily activities. As soon as possible, they report the content of their inner experiences upon receiving the signal. Researchers have used ESM to validate self-talk measures (e.g., ) and to sample ongoing athletic activity (). Despite the experience “closeness” of these methods, they still require some degree of interpretation and reporting from the participants that might be susceptible to biases.
A different line of research involves the use of personal pronouns in self-talk. For example, research on “self-distancing” (e.g., ; White et al., 2019) compares the effects of 3rd-person to 1st-person self-talk by asking participants to narrate a personal event with “they/he/she” or with “I/me.” Results show that the increased self-distancing created by 3rd-person self-talk has positive coping effects when people reflect on both past and future negative events. However, it could be argued that this kind of self-talk is unusual and does not typically occur very often naturalistically (i.e., most people typically use first-person “I” in their self-talk; see ). A related area that has yet to be explored is individual differences in preference for personal pronouns and how these might relate to personality traits.
Another possibility, which has been underutilized in the research literature, is to ask participants to imagine a specific personal or social situation and then report verbatim the kinds of things they would say to themselves as that situation occurs or in response to it having happened. This approach has the potential to provide insight into participants’ typical patterns of self-talk when different kinds of events occur. Some researchers (e.g., ; ) have asked participants to retrospect about different kinds of prior events (e.g., difficult, negative, or positive) and then report the self-talk and internal dialogues associated with those events. There is also work examining self-talk using prospective or hypothetical situations (e.g., ).
Researchers using retrospective or hypothetical approaches must be cognizant of the possibility of biases entering into the self-talk that participants recall or imagine (e.g., ). Exploring the nature of such potential biases might have important research implications for self-talk processes. For example, when people recall what they may have said to themselves in response to a past situation or event, researchers might examine the extent to which their subsequent thoughts, emotions, and behaviors are likely to be based on what they think happened versus what actually happened.
Frequency of self-talk
This section is designed to highlight some of the ways that measuring self-talk frequency presents specific research challenges and opportunities. A major challenge in self-talk research has been to quantify the frequency of self-talk (). A paper by suggests that, compared to DES frequency results, self-report measures such as the STS over-report actual frequencies of self-talk. We submit that this assertion constitutes an “apples to oranges” comparison fallacy. DES data, if accurate, can only indicate whether volunteers are talking to themselves at specific moments when they are probed, whereas questionnaire data reflect self-talk use in response to specific situations, using subjective frequency scales, and should not be converted to any absolute or relative frequency counts.
Descriptive Experiential Sampling involves a post-data collection interview aimed at double-checking the accuracy of participants’ reports of inner experiences. More fruitful research avenues include examining the effects of a DES interview on subsequent frequency of self-talk reports. Participants might exhibit significant declines in their self-reported self-talk scores after undergoing the DES interview compared to before doing so. That is, they might realize that they talk less often to themselves than they assume.
Self-talk interventions in the sport and clinical domains often rely on the introduction of new or different kinds of self-talk content and studying the effects of that content. For example, an important element of cognitive-behavioral therapy (CBT; ; ) is to help people identify their dysfunctional self-talk and then guide them toward replacing those instances with more positive, adaptive, rational, or realistic interpretations of events. There is strong evidence that this approach can be effective with a variety of psychological disorders (e.g., ). The focus of CBT is on the content of people’s self-talk, rather than with individual differences in the frequency of their everyday self-talk.
One area for future clinical research is to explore whether people who report talking to themselves very often in response to specific situations find it easier to benefit from CBT. Given that CBT aspires to change clients’ negative self-talk (e.g., ), it seems logical that individuals who report more frequent self-talk will respond more quickly and favorably to CBT interventions than those who report infrequent self-talk. On the other hand, sport-specific self-talk model predicts that the intentional use of self-talk can deplete a person’s cognitive resources. This suggests that clients whose frequency of intentionally used self-talk is so high that it causes cognitive depletion may be less able to use or benefit from CBT interventions than those with a lower frequency or less cognitively depleting self-talk. It would also be interesting to study how participating in CBT affects people’s awareness of and overall frequency of subsequent self-talk.
Brain localization of self-talk activity
Early attempts to locate self-talk activity in the brain involved recording neural activity using Positron Emission Tomography (PET) and functional magnetic resonance imaging (fMRI) scans while participants were silently reading single words or sentences, or when they engaged in working memory tasks requiring covert repetition of verbal material (e.g., ; ; ). The LIFG within Broca’s area is reliably activated during such simple covert self-talk tasks. Corroborating studies showed that accidental damage to the LIFG, or temporary disruption of LIFG activity using Repetitive Transcranial Magnetic Stimulation (rTMS), leads to self-talk disruption (e.g., ; ). Other studies looking at in-depth brain activation identified additional brain areas associated with self-talk production, such as Wernicke’s area, the supplementary motor area, insula, left superior parietal lobe, and right posterior cerebellar cortex (e.g., ).
Of course, self-talk is more than the mere silent reciting of words or sentences. More recent work has examined several variations in self-talk, such as in task-elicited compared to spontaneous self-talk, where the former was linked to decreased activation in Heschl’s gyrus and increased activation in the LIFG, while the latter had the opposite effect in Heschl’s gyrus and no significant effect in LIFG (). Compared to monologic self-talk, dialogic self-talk recruits a broader bilateral group of brain areas, some of which (e.g., right posterior superior temporal gyrus) are also activated when thinking about others’ mental states (). More recently, contrasted inner and overt speech using electroencephalography (EEG) and observed an inhibition of motor areas normally recruited during articulation.
Several research opportunities exist, where a comparison of differential brain activation will likely be noted between different forms of self-talk, including spontaneous, goal-directed, cue-based (instructional), and 1st-person compared to 3rd-person self-talk. To date, researchers have only begun examining how different forms of self-talk are localized in the brain. It is worth noting that while the above line of research is very informative regarding the neural substrates of self-talk, it tells us little about naturally occurring self-talk frequency and content. Recent small and portable ambulatory devices measuring brain activity occurring in natural environments have been developed (see ), which most likely will make it possible to identify the brain areas activated during naturally occurring self-talk.
Research opportunities moving forward
In this last section, we outline a few additional research ideas and current advances pertaining to the phenomenon of self-talk. One opportunity consists in being more creative when using the DES method. For example, recorded the actual content of self-talk each time probed participants reported an experience and examined activities participants were engaged in when hearing the beep. One prediction is that complex or challenging activities will generate more self-talk of a problem-solving nature, compared to trivial or repetitive tasks ().
Work on self-talk is now permeating Artificial Intelligence research. and have been trying to enhance human-robot cooperation via self-talk. Humans are exposed to a robot’s self-talk (i.e., human-like self-talk that is programmed into robots) during human-robot interactions. As a result of this exposure, humans are presumed to perceive the robot’s internal processes, and this is thought to increase transparency, trust, and cooperation. Preliminary results are encouraging.
Another fertile research area consists in the study of covert self-talk (inner speech) in aphasics—patients suffering from various language deficits following brain insult. Research on self-talk in aphasics offers interesting new theoretical avenues for brain localization and the relationship between interpersonal and intrapersonal communications. One main question is: do these patients, who exhibit problems with spoken language, experience similar difficulties with covert speech? Although the answer to this question varies depending on which method is used to assess inner speech (), the trend is that covert speech is often preserved (e.g., ; ), suggesting that overt and inner speech are clinically dissociable, with the latter being more resistant to brain damage. This research also shows that subjective and objective measures of self-talk are closely related with this population. Stark and colleagues, as well as Fama’s research team, are currently developing self-report measures of self-talk adapted to an aphasic population based on ’s General Inner Speech Questionnaire (B. Stark, personal communication, January 2, 2023; M. Fama, personal communication, January 20, 2023). This emerging research on aphasics illustrates the potential value of studying when self-talk “goes wrong” or is damaged.
Conclusion
In conclusion, we believe that continued interest in studying the various features of self-talk is warranted. There are many interesting aspects of the phenomenon that have yet to be fully explored. Although there are several methodological and measurement challenges to conducting research on self-talk, recent work offers much promise for additional theoretical developments and new interesting findings.
Statements
Author contributions
Both authors listed have made a substantial, direct, and intellectual contribution to the work, and approved it for publication.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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Summary
Keywords
self-talk, internal dialogue, inner speech, research challenges, methodological challenges, measurement challenge
Citation
Brinthaupt TM and Morin A (2023) Self-talk: research challenges and opportunities. Front. Psychol. 14:1210960. doi: 10.3389/fpsyg.2023.1210960
Received
23 April 2023
Accepted
19 June 2023
Published
03 July 2023
Volume
14 - 2023
Edited by
Eddy J. Davelaar, Birkbeck, University of London, United Kingdom
Reviewed by
Judy Van Raalte, Springfield College, United States
Updates
Copyright
© 2023 Brinthaupt and Morin.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Alain Morin, amorin@mtroyal.ca
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.