Sensory feedback modulates Weber's law of both perception and action.

Weber's law states that estimation noise is proportional to stimulus intensity. Although this holds in perception, it appears absent in visually guided actions where response variability does not scale with object size. This discrepancy is often attributed to dissociated visual processing for perception and action.

Current application of ChatGPT in undergraduate nuclear medicine education: Taking Chongqing Medical University as an example.

Background: Nuclear Medicine(NM), as an inherently interdisciplinary field, integrates diverse scientific principles and advanced imaging techniques. The advent of ChatGPT, a large language model, opens new avenues for medical educational innovation. With its advanced natural language processing abilities and complex algorithms, ChatGPT holds the potential to substantially enrich medical education, particularly in NM.

Factors associated with overdiagnosis of benign pulmonary nodules as malignancy: a retrospective cohort study.

Objective: To establish a preoperative model for the differential diagnosis of benign and malignant pulmonary nodules (PNs), and to evaluate the related factors of overdiagnosis of benign PNs at the time of imaging assessments.

Materials And Methods: In this retrospective study, 357 patients (median age, 52 years; interquartile range, 46-59 years) with 407 PNs were included, who underwent surgical histopathologic evaluation between January 2020 and December 2020. Patients were divided into a training set (n = 285) and a validation set (n = 122) to develop a preoperative model to identify benign PNs.

Prediction of brain age using quantitative parameters of synthetic magnetic resonance imaging.

Objective: Brain tissue changes dynamically during aging. The purpose of this study was to use synthetic magnetic resonance imaging (syMRI) to evaluate the changes in relaxation values in different brain regions during brain aging and to construct a brain age prediction model.

Materials And Methods: Quantitative MRI was performed on 1,000 healthy people (≥ 18 years old) from September 2020 to October 2021.

Heroin Addiction Induces Axonal Transport Dysfunction in the Brain Detected by In Vivo MRI.

Heroin is a highly addictive drug that causes axonal damage. Here, manganese-enhanced magnetic resonance imaging (MEMRI) was used to dynamically monitor axonal transport at different stages of heroin addiction. Rat models of heroin addiction (HA) and prolonged heroin addiction (PHA) were established by injecting rats with heroin at different stages.

Cranial irradiation-induced impairment of axonal transport and sexual function in male rats and imaging of the olfactory pathway by MRI.

Purpose: The aim of this study was to evaluate the effect of radiation-induced brain injury (RIBI) on axonal transport (AT) and sexual function.

Methods And Materials: Adult male rats received whole-brain radiation with a total dose of 30 Gy (15 Gy with 2 fractions) to build a RIBI model. Foraging behavior and sexual function were assessed, and MRI was performed 8 weeks after brain irradiation.