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In operant conditioning, the timing of reinforcement is crucial. For animals like rats and cats, immediate reinforcement (within a few seconds) is much more effective than delayed reinforcement. For example, a food reward for a rat needs to follow within 30 seconds of pressing a bar to be effective. 
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Affect plays a crucial role in shaping interpersonal evaluations and perceptions. Emotions influence how individuals judge and respond to others, often determining whether interactions are viewed positively or negatively. This effect can manifest directly through interactions with the person in question or indirectly via associations with unrelated emotional experiences.Direct Effects of Affect on AttractionAffect directly influences interpersonal attraction when a person’s behavior...
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Positive affect significantly influences cognitive processes, including evaluation, memory, creativity, and social judgments. Compared to negative affect, positive emotional states promote more favorable interpretations of stimuli, cognitive flexibility, and heuristic processing. These effects highlight emotions' powerful role in shaping how individuals perceive, remember, and interact with the world.Influence on Evaluation and AttributionWhen individuals experience positive affect, they are...
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Related Experiment Video

Updated: Feb 5, 2026

Mouse Model of Surgical Uterine Injury and Subsequent Pregnancy Outcomes
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Replacement Bisphenols Adversely Affect Mouse Gametogenesis with Consequences for Subsequent Generations.

Tegan S Horan1, Hannah Pulcastro1, Crystal Lawson1

  • 1School of Molecular Biosciences, Center for Reproductive Biology, Washington State University, Pullman, WA, USA.

Current Biology : CB
|September 18, 2018
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Exposure to bisphenol A (BPA) replacements, like bisphenol S (BPS), causes germline effects in both sexes, potentially impacting multiple generations. These findings highlight the reproductive risks of widespread chemical contaminants.

Keywords:
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Area of Science:

  • Reproductive Toxicology
  • Environmental Health
  • Endocrinology

Background:

  • Bisphenol A (BPA) exposure is linked to adverse developmental and reproductive effects across species.
  • Consumer demand for BPA-free products has led to the use of similar chemicals, such as bisphenol S (BPS), which are now environmental contaminants.
  • Previous studies showed BPA exposure increased chromosomally abnormal eggs in mice.

Purpose of the Study:

  • To investigate the effects of common BPA replacement bisphenols on germline integrity.
  • To determine if exposure to these chemicals induces multi-generational reproductive effects.
  • To assess the impact of environmental contaminants on research reproducibility.

Main Methods:

  • Studies were initiated by observing meiotic changes in mice.
  • Exposure to bisphenol S (BPS) from damaged polysulfone cages was investigated.
  • Germline effects in both male and female mice were analyzed.

Main Results:

  • Exposure to common replacement bisphenols, including BPS, induced germline effects.
  • These effects were observed in both sexes and may extend to multiple generations.
  • The findings suggest a broader biological risk associated with this class of chemicals.

Conclusions:

  • Replacement bisphenols pose risks to reproductive health, similar to BPA.
  • The rapid emergence of chemical variants complicates safety assessments and increases environmental contamination.
  • Germline sensitivity to endocrine-disrupting chemicals (EDCs) can introduce variability, potentially undermining scientific research.