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Narmashiri, A.

Publications and source records attributed to Narmashiri, A..

3 recordsLinked to original sources

Paranormal believers are more quickly and less accurate in rejecting the presence of the target in conjunction visual search compared to skeptics

Recent studies have shown that paranormal believers may exhibit cognitive dysfunctions, yet their performance in conjunction with visual search has not been understood. To address this issue, we examined the performance of both paranormal believers and skeptics in a conjunction visual search task, paying particular attention to their search time and accuracy across different set sizes in both target-present (TP) and target-absent (TA) trials. In our study, believers demonstrated a tendency toward speed but also displayed carelessness compared to skeptics when rejecting the presence of the target. Conversely, skeptics exhibited slower search times but demonstrated greater accuracy both in rejecting the presence of the target and in finding it. Overall, our findings suggest that believers were quicker and less accurate in rejecting the presence of the target in conjunction visual search compared to skeptics, highlighting potential differences in cognitive processing between skeptics and believers. Significant statementOur study investigates the performance of paranormal believers and skeptics in conjunction with visual search tasks, shedding light on potential differences in cognitive processing between the two groups. While believers demonstrate faster search times, they also display greater carelessness compared to skeptics when rejecting the targets presence. In contrast, skeptics exhibit slower search times but higher accuracy in both rejecting and finding the target. These findings underscore the importance of considering individual belief systems in understanding cognitive performance in conjunction with visual tasks.

neuroscience↗

Target location and age-related dynamics affect conjunction visual search dynamics

AbstractPrevious research has demonstrated that visual search is influenced by environmental factors, but the effects of specific variables, such as target distance from the visual field center and age, are not well understood. To address this issue, we aim to investigate their impact on visual search task. Participants engaged in target-present and target-absent trials, revealing distinct patterns in search times. Behavioral data and drift-diffusion modeling (DDM) showed that increasing the targets distance from the center of the visual field significantly reduces search efficiency. Additionally, age negatively impacts search performance, with older individuals exhibiting reduced efficiency. This comprehensive examination contributes to understanding cognitive mechanisms in visual processing. These findings highlight the importance of considering spatial and age-related factors in visual search tasks.

neuroscience↗

Value-based search efficiency is encoded in substantia nigra reticulata firing rate, spiking irregularity and local field potential

Recent results show that valuable objects can pop-out in visual search yet its neural mechanisms remain unexplored. Given the role of substantia nigra reticulata (SNr) in object value memory and control of gaze, we recorded its single unit activity while male macaque monkeys engaged in efficient or inefficient search for a valuable target object among low-value objects. Results showed that efficient search was concurrent with stronger inhibition and higher spiking irregularity in target present (TP) compared to target absent (TA) trials in SNr. Importantly, the firing rate differentiation of TP and TA trials happened within [~]100ms of display onset and its magnitude was significantly correlated with the search times and slopes (aka search efficiency). Time-frequency analyses of local field potential (LFP) after display onset revealed significant modulations of gamma band power with search efficiency. The greater reduction of SNr firing in TP trials in efficient search can create a stronger disinhibition of downstream superior colliculus which in turn can facilitate saccade to obtain valuable targets in competitive environments. Significant statementMost times we have to find a few relevant or highly valued objects among many objects that surround us. When our target objects are not distinct from their surroundings based on low-level features, searching for them becomes tedious and slow. Nevertheless, recent findings show that valuable objects can be found efficiently and fast if they have been repeatedly paired with reward. Our results show that the rate and pattern of spiking as well as local voltage fluctuations in the basal ganglia output which is known to control attention and saccade correlate with such value-driven search efficiency. Thus, in addition to reward learning, basal ganglia can have a role in skillful interactions with and rapid detection of rewarding objects.

neuroscience↗