Experience-Dependent Synaptic Plasticity in V1 Occurs without Microglial CX3CR1.

Brief monocular deprivation (MD) shifts ocular dominance and reduces the density of thalamic synapses in layer 4 of the mouse primary visual cortex (V1). We found that microglial lysosome content is also increased as a result of MD. Previous studies have shown that the microglial fractalkine receptor CX3CR1 is involved in synaptic development and hippocampal plasticity. We therefore tested the hypothesis that neuron-to-microglial communication via CX3CR1 is an essential component of visual cortical development and plasticity in male mice. Our data show that CX3CR1 is not required for normal development of V1 responses to visual stimulation, multiple forms of experience-dependent plasticity, or the synapse loss that accompanies MD in layer 4. By ruling out an essential role for fractalkine signaling, our study narrows the search for understanding how microglia respond to active synapse modification in the visual cortex.SIGNIFICANCE STATEMENT Microglia in the visual cortex respond to monocular deprivation with increased lysosome content, but signaling through the fractalkine receptor CX3CR1 is not an essential component in the mechanisms of visual cortical development or experience-dependent synaptic plasticity.

Fidget spinners: Purported benefits, adverse effects and accepted alternatives.

PURPOSE OF REVIEW: In the span of a few months, fidget spinners have caught the eyes of millions of children, parents, educators and paediatricians. Fidget spinners, hand-held toys designed to spin freely in your grasp, have become a source of entertainment for consumers of all ages. Despite a lack of scientific evidence, toy marketers have advertised the benefits of fidget spinners for children with attention-deficit/hyperactivity disorder and other disorders (e.g. autism, anxiety, sensory issues). Parents are incentivized by these purported benefits to purchase fidget spinners to improve their child's concentration and decrease stress. RECENT FINDINGS: While fidget spinners are a new phenomenon, existing therapy toys (e.g. sensory putty) have been used by occupational therapists for similar reasons, with comparably little research supporting these claims. The purpose of this review is to explore literature regarding sensory toys and examine educator/professional-reported concerns and medical adverse effects of using fidget spinners. SUMMARY: Due to a recent surge in popularity, fidget spinners and other self-regulatory occupational therapy toys have yet to be subjected to rigorous scientific research. Thus, their alleged benefits remain scientifically unfounded. Paediatricians should be aware of potential choking hazards with this new fad, and inform parents that peer-reviewed studies do not support the beneficial claims.

Sex and estrous cycle affect experience-dependent plasticity in mouse primary visual cortex.

Sex hormones can affect cellular physiology and modulate synaptic plasticity, but it is not always clear whether or how sex-dependent differences identified in vitro express themselves as functional dimorphisms in the brain. Historically, most experimental neuroscience has been conducted using only male animals and the literature is largely mute about whether including female mice in will introduce variability due to inherent sex differences or endogenous estrous cycles. Though this is beginning to change following an NIH directive that sex should be included as a factor in vertebrate research, the lack of information raises practical issues around how to design experimental controls and apply existing knowledge to more heterogeneous populations. Various lines of research suggest that visual processing can be affected by sex and estrous cycle stage. For these reasons, we performed a series of in vivo electrophysiological experiments to characterize baseline visual function and experience-dependent plasticity in the primary visual cortex (V1) of male and female mice. We find that sex and estrous stage have no statistically significant effect on baseline acuity measurements, but that both sex and estrous stage have can modulate two mechanistically distinct forms of experience dependent cortical plasticity. We also demonstrate that resulting variability can be largely controlled with appropriate normalizations. These findings suggest that V1 plasticity can be used for mechanistic studies focusing on how sex hormones effect experience dependent plasticity in the mammalian cortex.

Prevalence and Longevity of PTSD Symptoms Among Parents of NICU Infants Analyzed Across Gestational Age Categories.

Objective. This study aims to investigate whether posttraumatic stress disorder (PTSD) symptoms exist >1 year after neonatal intensive care unit (NICU) experience and whether PTSD symptomatology differs across parents of infants of different gestational age categories. Methods. A survey was given to parents at routine NICU follow-up visits. Parents completed the PTSD CheckList-Civilian (PCL-C), a standardized scale comprising 17 key symptoms of PTSD. Parents also rated how traumatic their birth experience, first day in the NICU, and first week in the NICU were from "Not Traumatic at All" to "Most Traumatic." Fisher's exact test was used to compare PCL-C responses across gestational age categories (Extremely Preterm, Very Preterm, Moderate to Late preterm, and Full Term). Results. Eighty parents participated. In total, 15% of parents had "Moderate to High Severity" PTSD symptoms. There were no statistical differences in PTSD prevalence between parents of children <1 year old and parents of children >1 year old (P = .51). There was also no statistical difference in prevalence of "Moderate to High Severity" level of PTSD symptoms across gestational age (P = .16). Overall, 38% of parents rated at least one experience as "Most traumatic." Conclusion. A high percentage of parents who had a recent NICU experience and parents who had a NICU experience more than a year ago demonstrated PTSD symptoms. In light of these results, many parents of NICU graduates-both mothers and fathers-would benefit from access to long-term counseling services.