Barriers and facilitators of bystander intervention in response to racism in Colombia.

Racial discrimination is a pervasive global problem. Bystanders who observe racism can intervene to support the targets of racism, but they often fail to do so due to several context-specific barriers. There is currently little research on bystander behaviour in racism outside of English-speaking countries.

Emotional words evoke region- and valence-specific patterns of concurrent neuromodulator release in human thalamus and cortex.

Words represent a uniquely human information channel-humans use words to express thoughts and feelings and to assign emotional valence to experience. Work from model organisms suggests that valence assignments are carried out in part by the neuromodulators dopamine, serotonin, and norepinephrine. Here, we ask whether valence signaling by these neuromodulators extends to word semantics in humans by measuring sub-second neuromodulator dynamics in the thalamus (N = 13) and anterior cingulate cortex (N = 6) of individuals evaluating positive, negative, and neutrally valenced words.