Black students noted, however, that harm is mitigated when online racial discrimination is challenged by their White peers. Further, findings indicated that White students may be more likely to publicly confront racist posts if they (a) are aware of the harm it causes their Black peers; (b) perceive social norms that support confronting discrimination; and (c) receive guidance on what to say. (PsycInfo Database Record (c) 2021 APA, all rights reserved).The orbitofrontal cortex (OFC) has been proposed to encode expected outcomes, which is thought to be important for outcome-directed behavior. However, such neural encoding can also often be explained by the recall of information about the recent past. To dissociate the retrospective and prospective aspects of encoding in the OFC, we designed a nonspatial, continuous, alternating odor-sequence task that mimicked a continuous T-maze. The task consisted of two alternating sequences of four odor-guided trials (2 sequences × 4 positions). In each trial, rats were asked to make a "go" or "no-go" action based on a fixed odor-reward contingency. Odors at both the first and last positions were distinct across the two sequences, such that they resembled unique paths in the past and future, respectively; odors at positions in between were the same and thus resembled a common path. We trained classifiers using neural activity to distinguish between either sequences or positions and asked whether the neural activity patterns in the common path were more like the ones in the past or the future. We found a proximal prospective code for sequence information as well as a distal perspective code for positional information, the latter of which was closely associated with rats' ability to predict future outcomes. This study demonstrates a behaviorally relevant predictive code in rat OFC. (PsycInfo Database Record (c) 2021 APA, all rights reserved).The present study examined the effects of the muscarinic acetylcholine receptor (mAChR) antagonist, scopolamine, on standard contextual fear conditioning (sCFC).  https://www.selleckchem.com/products/odq.html  It compared effects of the drug on acquisition (post-shock freezing) versus 24-hr retention of a context-shock association acquired after one or three pairings of a context with unsignaled shock. During single-trial sCFC, systemic scopolamine (0.5 mg/kg, i.p.) prior to training abolished both post-shock and retention freezing (Experiment 1). This same injection during multiple-trial sCFC also abolished post-shock freezing and impaired 24-hr retention freezing (Experiment 2). These results indicate that cholinergic signaling mediates both acquisition and 24-hr retention of a context-shock association across different trial parameters. Experiment 3 further explored these effects by infusing scopolamine (35 μg per side) into the dorsal hippocampus (dHPC) prior to training in single versus multiple-trial sCFC. This infusion spared post-shock but abolished retention test freezing in single-trial sCFC (Experiment 3A), and had no effect on multiple-trial sCFC (Experiment 3B). The current findings suggest that brain-wide cholinergic signaling mediates acquisition and retention of single-trial sCFC. Despite this, while muscarinic cholinergic signaling in the dHPC does mediate retention of single-trial sCFC, it is not required for acquisition of either variant, or retention of multiple-trial sCFC. These findings also rule out impaired sensory processing of contextual cues as a mechanism of impaired context learning by dHPC scopolamine. The results are discussed in relation to the role of cholinergic function across multiple brain memory systems in elemental versus configural forms of contextual fear conditioning (Fanselow, 2010; Rudy, 2009). (PsycInfo Database Record (c) 2021 APA, all rights reserved).Many foraging experiments have found that subjects are suboptimal in foraging tasks, waiting out delays longer than they should given the reward structure of the environment. Additionally, theories of decision-making suggest that actions arise from interactions between multiple decision-making systems and that these systems should depend on the availability of information about the future. To explore suboptimal behavior on foraging tasks and how varying the amount of future information changed behavior, we ran rats on two matching neuroeconomic foraging tasks, Known Delay (KD) and Randomized Delay (RD), with the only difference between them being the certainty of the cost of future opportunities. Rats' decision-making strategies differed significantly based on the amount of future certainty. Rats on both tasks still showed suboptimality in decision-making through a sensitivity to sunk costs; however, rats on KD showed significantly less sensitivity to sunk costs than rats on RD. Additionally, on neither task did the rats account for travel and postreward lingering times as heavily as prereward foraging times providing evidence problematic for the Marginal Value Theorem model of foraging behavior. This suggests that while future certainty reduced decision-making errors, more complex decision-making processes unaffected by future certainty were involved and likely produced these decision-making errors within subjects on these foraging tasks. (PsycInfo Database Record (c) 2021 APA, all rights reserved).The dynamics of momentum-dark exciton formation in transition metal dichalcogenides is difficult to measure experimentally, as many momentum-indirect exciton states are not accessible to optical interband spectroscopy. Here, we combine a tunable pump, high-harmonic probe laser source with a 3D momentum imaging technique to map photoemitted electrons from monolayer WS2. This provides momentum-, energy- and time-resolved access to excited states on an ultrafast time scale. The high temporal resolution of the setup allows us to trace the early-stage exciton dynamics on its intrinsic time scale and observe the formation of a momentum-forbidden dark KΣ exciton a few tens of femtoseconds after optical excitation. By tuning the excitation energy, we manipulate the temporal evolution of the coherent excitonic polarization and observe its influence on the dark exciton formation. The experimental results are in excellent agreement with a fully microscopic theory, resolving the temporal and spectral dynamics of bright and dark excitons in WS2.