Browsing by Subject "Time of day"

Now showing 1 - 3 of 3
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    Rats conserve passive avoidance retention level throughout the light phase of diurnal cycle.
    (Elsevier, 2023-05-10) Morales-Delgado, Nicanor; Popovic, Natalija; Cruz Sánchez, Ernesto de la; Popovic Popovic, Miroljub; Anatomía Humana y Psicobiología
    Emotions and memory formation are sensible to circadian rhythm. Here we study whether the time of day during the light phase of the diurnal cycle affects emotional memory in male Wistar rats using the passive avoidance (PA) test. Experiments were conducted at the beginning of Zeitgeber time (ZT) (ZT0.5-2), mid-time (ZT5-6.5), and end (ZT10.5-12) of the light period. Our results suggest that time of day has no impact on emotional response during acquisition trials, but slightly influences cognitive response during the 24-hour retention trial. Retention response was highest for ZT5-6.5, followed by ZT0.5-2, and lowest for ZT10.5-12.
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    Sex and time-of-day impact on anxiety and passive avoidance memory strategies in mice
    (Frontiers Media, 2020-05-25) Meseguer Henarejos, Ana Belén; Bokonjic, Dubravko; Morales-Delgado, Nicanor; Caballero Bleda, María; Alonso Fuentes, Antonia; Popovic, Natalija; Popovic Popovic, Miroljub; Anatomía Humana y Psicobiología
    In humans, anxiety and cognitive processes are age, gender, and time of day dependent. The purpose of the present study was to assess whether the time of day and sex have an influence on anxiety and emotional memory in adult mice. Light-dark and passive avoidance (PA) tests were performed at the beginning and at the end of the light cycle, defined as Zeitgeber time (ZT) ZT0-2.5 and ZT9.5-12, respectively. A baseline difference in anxiety was not found, but on the 24 h retention trial of the PA test, females presented longer latencies to enter into the dark compartment at the ZT0-2.5 time point of the day. The data from the second test day (PA reversal trial) indicated that some animals associated the dark compartment with an aversive stimulus (shock), while others associated the aversive stimulus with crossing from one compartment to another. At the ZT9.5-12, female mice mainly related the aversive stimulus to transferring from one compartment to another, while male mice associated darkness with the aversive stimulus. There was a negative correlation between the frequency of light-dark transitions in the light-dark test and the PA latency on the 24 h retention trial in males tested at ZT0-2.5. The PA latency on the reversal and 24 h retention trials negatively correlated with a risk assessment behavior in male mice tested on ZT0-2.5 and ZT9.5-12, respectively. In conclusion, our data reveal that the impact of motor activity and risk assessment behavior on PA memory formation and applied behavioral strategies are time of day and sex dependent.
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    Testing the modulation of self-related automatic and others-related controlled processing by chronotype and time-of-day
    (Elsevier, 2024-01-09) Palmero Jara, Lucía Beatriz; Tortajada Gomariz, Miriam; Campoy Menéndez, Guillermo; Fuentes Melero, Luis José; Martínez Pérez, Víctor; Psicología Básica y Metodología
    We assessed whether self-related automatic and others-related controlled processes are modulated by chronotype and time-of-day. Here, a shape-label matching task composed of three geometrical shapes arbitrarily associated with you, friend, and stranger was used. Twenty Morning-types, and twenty Evening-types performed the task at the optimal and non-optimal times of day (i.e., 8 AM, or 8:30 PM). Morning-types did not exhibit noticeable synchrony effects, thus proving the better adaptation of these participants to non-optimal moments of the day as compared to Evening-types. Contrary to our predictions regarding the absence of automatic-processing modulation and the presence of controlled-processing influences by time-of-day, we found an influence on self-related but not others-related processing only in Evening-type participants. Although brain structures are not directly tackled, we argue that such modulation may be due to the dependence of the activation of the ventromedial prefrontal cortex (VMPFC), an essential component of the self-attention network on circadian rhythms.