Inhibition is not a single construct and it is better understood as being comprised by different cognitive processes. The Stroop-matching and the stop-signal tasks represent two important ways to evaluate distinct inhibitory functions. Using a nonclinical population, this study investigated interactions between these two behavioral tasks by examining how the stop-signal performance (i.e., the latency of response inhibition represented by the stop-signal reaction time—SSRT) varied according to the inhibitory demands imposed by different Stroop-matching conditions. Moreover, response latencies and SSRTs obtained in the Stroop/stop task were correlated using the Bayesian approach with self-report impulsivity levels evaluated by the Urgency, lack of Premeditation, lack of Perseverance, and Sensation Seek (UPPS) and the Barratt Impulsiveness Scale (BIS-11) scales. The results showed that SSRTs varied according to the Stroop-matching conditions: SSRTs were longer for Stroop conditions with more inhibitory demands, which indicate an interaction between the inhibitory mechanisms involved in both tasks. Furthermore, the Bayesian approach revealed significant evidence of negative correlations between SSRTs and impulsivity scores from the UPPS, in which more impulsive participants showed faster inhibitory processes. This finding was discussed following the idea of functional impulsivity proposed by Dickman (1990). Our data indicate the potential use of the current protocol to investigate the inhibitory functions in nonclinical and clinical populations in seeking better understanding of the inhibition-impulsivity binomial.
IntroductionADHD is associated with impairments in different inhibitory functions, including suppression of an already initiated response and inhibition of distracting information. This work used a protocol that combines the Stroop-matched and stop-signal tasks to examine the association between the frequency of ADHD symptoms and different inhibitory abilities in a young adult.ObjectivesTo investigate how the symptoms of inattention and hyperactivity / impulsivity are associated with three forms of inhibition evaluated by the Stroop-matched / stop-signal task: inhibiting an automatic response, controlling interference and canceling a response.Methods38 participants (33 women; mean age = 23.3; SD = 5.17) completed Adult ADHD Self-Report Scale (ASRS) assessing ADHD symptoms before performing the task. Reaction times, accuracy and stop-signal reaction time (SSRT; the latency of the inhibitory process of response cancellation) were calculated for each task condition.ResultsThere was a significant correlation of ADHD symptoms and SSRT in the condition with the higher perceptual load (i.e., a greater number of colors presented in the same test). This correlation was negative (r = - .36, p <.05), which indicates that participants with higher ADHD symptoms frequency had more efficient inhibitory processes in this condition.Conclusions(1) the perceptual load of the task influences the cancellation of responses; (2) individuals with higher frequency of ADHD symptoms may have a better inhibitory capacity when the perceptual load is high, possibly reflecting a lower availability of attentional resources to process distracting information.DisclosureNo significant relationships.
IntroductionInhibition is a core component of executive functions but is not a unitary construct. Instead, different inhibitory processes have specific behavioral effects and neural bases. Three important inhibitory functions explored by the literature are 1) interference control (i.e., inhibition of distractive information); 2) inhibition of prepotent responses and 3) inhibition of ongoing responses. These functions were described in the self-regulation theory as the possible main impairment in attention-deficit hyperactivity disorder (ADHD) and since then they have shown an association with several psychiatric disorders.ObjectivesThe current study investigated the neural bases of interference control, inhibition of prepotent responses, and inhibition of ongoing responses as they were assessed by a Stroop-matching/stop-signal task developed by our group.MethodsThe Stroop-matching/stop-signal employs different conditions to create the demands for each inhibition which allows the assessment of these functions using a single protocol. Brain activations were acquired using fNRIS in a block-design method. The concentration of oxygenated hemoglobin (HbO). The first level analysis of HbO signals used a general linear model (GLM) to estimate individual brain activations. The second level analysis was performed using a linear mixed model to generate brain activations at the group level. Alpha level = 0.05 and the false discovery rate was applied when necessary. The sample was composed of 25 young adults (mean age = 21.8, SD = 4.39).Resultstask Interference control showed activation in the left and right temporoparietal junction (TPJ), the right dorsolateral prefrontal cortex (DPLFC), and inferior frontal gyrus (IFG); inhibition of prepotent responses showed increased activity in the right IFG and left DLPFC; the suppression of ongoing responses showed a deactivation of the IFG and DLPFC bilaterally.ConclusionsThese results indicate that the three inhibitory functions assessed present distinct brain patterns of function. The lateralization role was evident in DLPFC and IFG activities and recruitment of parietal areas seems to be limited to interference control in this protocol. Also, the stop-signal demand led to the deactivation of areas associated with the resolution of the primary Stroop-matching task. This study elucidates the role of brain mechanisms associated with specific inhibitory processes that are impaired in psychiatric disorders such as ADHD.Financial support: FAPESP [grant 2019/20757-5, 2019/21773-4, 2020/14800-2]; CAPES Proex [grant 0426/2021, 23038.006837/2021-73]; Mackpesquisa; CNPq [grant 307443/2019-1]Disclosure of InterestNone Declared
The discrepancy between one’s actual body and the ideal body, especially among young adults, can lead to body dissatisfaction in both men and women, which is commonly accepted to be central to eating disorders. We explored aspects of body image and eating disorders in healthy Brazilian students (n = 219) using two standardized measures (Body Shape Questionnaire [BSQ-34] and Eating Attitudes Test [EAT-26]) and assessing height, weight, Body Mass Index (BMI), and the history of physical activity. We also analyzed the ability of one measure to predict another. Linear multiple regression was used to verify which variables best predicted the scale outcomes. The Least Absolute Shrinkage and Selection Operator (LASSO) was used for variable selection. The results suggested that women have a greater risk of body dissatisfaction and eating disorders. Both instruments had variables that significantly predicted each other’s results, whereas BMI was only associated with BSQ-34 scores. These findings broaden our understanding of eating disorders and body image.
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