Biology subjects

Barandon, P. L.

Publications and source records attributed to Barandon, P. L..

3 recordsLinked to original sources

bioRxiv2026

Neural Control of Autonomic Arousal During Threat Anticipation Revealed by High-Resolution Cardiac Contractility

The sympathetic nervous system prepares the organism for adaptive action by shaping physiological, affective, and behavioral responses to environmental demands. Yet, how sympathetic signals dynamically couple with neural systems supporting emotional experience and behavior remains poorly understood, in part because common indices such as skin conductance responses lack sufficient temporal resolution to track these dynamics. Here, we evaluated trans-radial electrical bioimpedance velocimetry (TREV), a non-invasive measure of beat-to-beat cardiac contractility, and compared it with skin conductance responses during threat anticipation and simultaneous fMRI. Participants (n=60) completed a threat-of-shock paradigm requiring goal-directed action. Cardiac contractility increased during threat anticipation, covaried with skin conductance responses, and independently predicted self-reported emotional intensity. Critically, threat-related increases in contractility--but not skin conductance--tracked threat-related modulation of activation in dorsomedial prefrontal cortex, posterior parietal cortex, and cerebellum, with contractility-modulated cerebellar activation predicting faster motor responses under threat. These findings establish TREV-derived cardiac contractility as a physiological signal linking sympathetic drive with neural responding, emotional experience, and adaptive behavioral mobilization during emotion-guided action.

neuroscience↗

bioRxiv2026

Distinct amygdalar pathways to frontopolar cortex and medial temporal lobe support temporal memory for emotional events

Growing evidence suggests that emotion shapes temporal aspects of memory--such as remembering when an event occurred--yet the neural bases of these effects remain unclear. Prior work indicates that temporal-context representations in memory are supported by the function of medial temporal lobe (MTL) and prefrontal regions with privileged access to amygdala-originated affective signals, which may mediate emotional influences on temporal memory--including hippocampus, perirhinal cortex, and lateral frontopolar cortex (FPl). To test whether these candidate pathways shape temporal memory for emotional events, participants encoded trial-unique negative and positive images in the scanner, followed by a surprise temporal memory task. We found that more negative stimuli were associated with greater amygdala activation and lower temporal-memory error for when emotional images occurred. Replicating and extending prior work, higher stimulus-evoked multivoxel pattern similarity in the hippocampus (between trials) and FPl (within and between trials) was associated with higher temporal memory errors. Notably, greater amygdala responding to emotional images predicted higher between-trial pattern similarity in the hippocampus, but lower within- and between-trial similarity in FPl. Amygdala engagement was also correlated with greater perirhinal activation, which in turn predicted stronger item memory and a recency bias in temporal memory estimates. Collectively, these findings reveal distinct--and opposing--modulatory effects of amygdala-FPl and amygdala-MTL pathways on temporal memory, with the potential to sharpen and blur memory for when emotional events occurred. Significance statementEmotional events influence how we remember time. Prior work implicates function of the lateral frontal pole (FPl) and medial temporal lobe (MTL) regions--including hippocampus and perirhinal cortex--in temporal memory. Yet, whether and how these areas support temporal memory for emotional events remains unclear. Using trial-unique emotional images, we found that negative-emotional valence was associated with stronger amygdala activation and temporal-memory accuracy. Higher pattern similarity in hippocampus and FPl predicted worse temporal memory. Notably, amygdala activation predicted higher between-trial hippocampal pattern similarity but lower within-trial FPl similarity. Perirhinal engagement, which correlated with amygdala activation and item memory, predicted a recency bias in temporal-memory judgments. Together, these findings reveal distinct amygdala-MTL and amygdala-prefrontal pathways through which emotion shapes temporal memory.

neuroscience↗

bioRxiv2025

Integrated Representations of Threat and Controllability in the Lateral Frontal Pole

Emotional processing is ubiquitous in everyday life, informing goal pursuit not only in response to current demands, but also in anticipation of future outcomes. Lateral prefrontal (LPFC) function supports cognitive control, and emerging evidence suggests a unique role for its anterior-most region--the lateral frontal pole (FPl)--in integrating putatively amygdala-originated emotion signals with goal information. However, whether these organizational properties of LPFC are expressed during the anticipation of future threat remains unknown. Here, we used FIR modeling and pattern similarity analysis to examine dynamic engagement and representational properties of distinct LPFC regions during threat anticipation requiring goal-directed action. Healthy participants (n=67) were scanned during a threat-of-shock paradigm consisting of a prolonged (18s) countdown to possible shock administration. Threat unpleasantness and controllability were manipulated orthogonally: in controllable trials, participants could avoid an unpleasant or mild shock by making a successful time-sensitive response; in uncontrollable trials, shocks were administered regardless of performance. LPFC robustly coded for anticipated threat unpleasantness, with FPl showing the strongest modulation by threat unpleasantness and controllability relative to caudal and mid-LPFC regions. Caudal and mid-LPFC maintained independent representations of threat unpleasantness and controllability. In contrast, FPl held conjunctive threat-and-controllability representations, which were associated with successful motor performance following anticipation of unpleasant shocks. Stronger conjunctive FPl representations were also associated with greater inverse amygdala-FPl coupling. Together, these findings provide insight into LPFC organization under naturalistic emotional challenges and highlight a key role for FPl in integrating affective and control-related information during threat anticipation to support goal-directed action. Significance StatementAnticipating emotionally-charged events--such as a painful outcome we may or may not be able to avoid--requires integrating emotion and control to guide behavior. However, the neural mechanisms through which emotional states influence goal-directed behavior in naturalistic, anticipatory emotional contexts remain unclear. Using a threat-of-shock paradigm and multivariate analyses we show that the anterior-most region of the lateral prefrontal cortex (LPFC)--the lateral frontal pole (FPl)--uniquely integrates information about the emotional unpleasantness and controllability of a future event, and that the strength of this integrated signal predicts better behavioral performance. These findings extend models of LPFC function to naturalistic, emotional contexts, and highlight the FPl as a key node for translating emotional and behavioral-control information into adaptive action.

neuroscience↗