Subliminal fatty acid-induced gut-brain signals attenuate sensitivity to exteroceptive rewards in food but not in sex or financial domains, in healthy men.

Background Reward sensitivity can generalize across domains, but evidence for generalization of suppressive reward-related stimulation is sparse, especially in the context of interoceptive nutrient-related stimuli. We hypothesized that subliminal fatty acid-induced gut-brain signals could attenuate sensitivity to exteroceptive rewards, not only within the food domain but also across domains. Method Intragastric infusion of 2.5 g lauric acid (fat condition) or saline (saline condition) was administered to 59 healthy heterosexual male volunteers in a blinded fashion. To assess whether the resulting interoceptive signals attenuate reward sensitivity within the food domain, participants rated the palatability of food images and performed a progressive ratio task. To assess whether such attenuation effect generalizes to the sexual and financial reward domains, participants rated attractiveness of female face images and performed an intertemporal monetary choice task. Results Participants' ratings of food images were lower (F1,172 = 4.51, p = 0.035, Cohen's d: -0.20) in the fat condition. The progressive ratio task terminated earlier in the fat condition compared to saline (F1,52 = 4.17, p = 0.046, odds ratio = 0.31, 95%CI [0.11, 0.98]). Participants' ratings of female face images did not differ between conditions (F1,172 = 1.85, p = 0.19, Cohen's d: -0.15). Moreover, the monetary discounting rate did not differ significantly between conditions. Conclusion Overall, these findings suggest a domain-specific effect of subliminal fatty acid infusion on decreasing reward sensitivity.

Reinstating the Resourceful Self: When and How Self-Affirmations Improve Executive Performance of the Powerless.

Research has found that lack of power impairs executive functions. In the present research, we show that this impairment is not immutable. Across three studies and focusing on inhibitory control as one of the core facets of executive functions, our investigation shows that self-affirmation attenuates the previously documented decrements in inhibitory control of the powerless (Studies 1-3). We also examine boundary conditions of this effect and demonstrate that self-affirmation is most effective insofar as the powerless lack self-esteem (Study 2). Finally, we directly test the underlying process of this effect and demonstrate that self-affirmation increases an efficacious self-view among the powerless, which in turn improves their inhibitory control abilities (Study 3). Overall, we conclude that reinstating an efficacious self-view through self-affirmation offsets the impairments in inhibitory control abilities of the powerless and reduces the cognitive performance gap between the powerless and the powerful.

Self-Affirmation Reduces Delay Discounting of the Financially Deprived.

Financial deprivation is associated with excessive discounting of delayed rewards. In the present research, we argue that this counterproductive tendency may be driven, at least in part, by the aversive and self-threatening nature of experiencing financial deprivation. Accordingly, we propose that self-affirmation-an intervention known to buffer negative consequences of psychological threats-may reduce delay discounting of the financially deprived. Results of two high-powered, preregistered experiments support this proposition. Specifically, in Study 1 (n = 546), we show that among participants with relatively lower income, self-affirmation effectively reduces delay discounting. In Study 2 (n = 432), we manipulate the feeling of financial deprivation and demonstrate that self-affirmation reduces delay discounting among those who feel financially deprived. We also examine the underlying process of this effect and find that self-affirmation bolsters a sense of personal control among those who feel financially deprived, which in turn reduces their delay discounting (Study 2). Overall, our findings suggest that the relationship between financial deprivation and delay discounting is malleable and psychological interventions that attenuate self-threats and bolster a sense of personal control can be applied to reduce myopic tendencies of the poor.

Defecatory urge increases cognitive control and intertemporal patience in healthy volunteers.

BACKGROUND: Past research has demonstrated that moderate urge to urinate improves inhibitory control, specifically among participants with higher behavioral inhibition sensitivity (BIS). The effect was absent when the urge exceeded intolerable level. The present research examines whether rectal distension-induced urge to defecate has similar effects. METHODS: The moderate and high defecatory urge were induced by rectal distension in healthy volunteers (n = 35), while they completed Stroop task and monetary delay discounting task. The difference of average reaction time between incongruent and congruent trials in the Stroop task (Stroop interference) and the preference for larger-later rewards in the delay discounting task were the primary outcomes. KEY RESULTS: Participants with high BIS (n = 17) showed greater ability to inhibit their automatic response tendencies, as indexed by their Stroop interference, under moderate urge relative to no urge (128 ± 41 ms vs 202 ± 37 ms, t64  = 2.07; P = 0.021, Cohen's d: 0.44), but not relative to high urge (154 ± 45 ms, t64  = 1.20; P = 0.12, Cohen's d: 0.30). High BIS participants also showed a higher preference for larger-later reward in the delay discounting task under high (odds ratio = 1.51 [1.02-2.25], P = 0.039) relative to no urge, but not relative to moderate urge (odds ratio = 1.02 [0.73-1.42], P = 0.91). In contrast, rectal distension did not influence performance on either of the tasks in participants with low BIS (n = 18). CONCLUSIONS AND INFERENCE: These findings may be interpreted as a "spill-over" effect of inhibition of the urge to defecate to volitional cognitive control among healthy participants with high BIS.

Social Power Increases Interoceptive Accuracy.

Building on recent psychological research showing that power increases self-focused attention, we propose that having power increases accuracy in perception of bodily signals, a phenomenon known as interoceptive accuracy. Consistent with our proposition, participants in a high-power experimental condition outperformed those in the control and low-power conditions in the Schandry heartbeat-detection task. We demonstrate that the effect of power on interoceptive accuracy is not explained by participants' physiological arousal, affective state, or general intention for accuracy. Rather, consistent with our reasoning that experiencing power shifts attentional resources inward, we show that the effect of power on interoceptive accuracy is dependent on individuals' chronic tendency to focus on their internal sensations. Moreover, we demonstrate that individuals' chronic sense of power also predicts interoceptive accuracy similar to, and independent of, how their situationally induced feeling of power does. We therefore provide further support on the relation between power and enhanced perception of bodily signals. Our findings offer a novel perspective-a psychophysiological account-on how power might affect judgments and behavior. We highlight and discuss some of these intriguing possibilities for future research.