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Place field assembly distribution encodes preferred locations.

ABSTRACT: The hippocampus is the main locus of episodic memory formation and the neurons there encode the spatial map of the environment. Hippocampal place cells represent location, but their role in the learning of preferential location remains unclear. The hippocampus may encode locations independently from the stimuli and events that are associated with these locations. We have discovered a unique population code for the experience-dependent value of the context. The degree of reward-driven navigation preference highly correlates with the spatial distribution of the place fields recorded in the CA1 region of the hippocampus. We show place field clustering towards rewarded locations. Optogenetic manipulation of the ventral tegmental area demonstrates that the experience-dependent place field assembly distribution is directed by tegmental dopaminergic activity. The ability of the place cells to remap parallels the acquisition of reward context. Our findings present key evidence that the hippocampal neurons are not merely mapping the static environment but also store the concurrent context reward value, enabling episodic memory for past experience to support future adaptive behavior.

SUBMITTER: Mamad O

PROVIDER: S-EPMC5609775 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature

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Place field assembly distribution encodes preferred locations.

Mamad Omar O Stumpp Lars L McNamara Harold M HM Ramakrishnan Charu C Deisseroth Karl K Reilly Richard B RB Tsanov Marian M

PLoS biology 20170912 9

The hippocampus is the main locus of episodic memory formation and the neurons there encode the spatial map of the environment. Hippocampal place cells represent location, but their role in the learning of preferential location remains unclear. The hippocampus may encode locations independently from the stimuli and events that are associated with these locations. We have discovered a unique population code for the experience-dependent value of the context. The degree of reward-driven navigation ...[more]

PMID: 28898248

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Project description:Objective: Meningiomas presented preferred intracranial distribution, which may reflect potential biological natures. This study aimed to analyze the preferred locations of meningioma according to different biological characteristics. Method: A total of 1,107 patients pathologically diagnosed with meningiomas between January 2012 and December 2016 were retrospectively analyzed. Preoperative MRI were normalized, and lesions were semiautomatically segmented. The stereospecific frequency and p value heatmaps were constructed to compare two biological phenotypes using two-tailed Fisher's exact test. Age, sex, WHO grades, extent of resection (EOR), recurrence, and immunohistochemical markers including p53, Ki67, epithelial membrane antigen (EMA), progesterone receptor (PR), and CD34 were statistically analyzed. Recurrence-free survival (RFS) were analyzed by Kaplan-Meier method. Result: Of 1,107 cases, convexity (20.8%), parasagittal (16.1%), and falx (11.4%) were the most predominant loci of meningiomas. The p-value heatmap suggested lesion predominance in the left frontal and occipital convexity among older patients while in the left sphenoid wing, and right falx, parasellar/cavernous sinus, and middle fossa among younger patients. Lesions located at anterior fossa and frontal structures were more frequently seen in the male while left parietal falx and tentorial regions, and right cerebellopontine angle in the female. Grades II and III lesions presented predominance in the frontal structures compared with grade I ones. Meningiomas at the left parasagittal sinus and falx, tentorium, intraventricular regions, and skull-base structures were significantly to receive subtotal resection. Lesions with p53 positivity were statistically located at the left frontal regions and parasellar/cavernous sinus, higher Ki67 index at the left frontal and bilateral parietal convexity and right parasellar/cavernous sinus, EMA negativity at the right olfactory groove and left middle fossa, and CD34 positivity at the sellar regions and right sphenoid wing. Tumor recurrence rates for grades I, II, and III were 2.8, 7.9, and 53.8%, respectively. Inferior RFS, higher Ki67 index, grades II and III, and a larger preoperative volume were observed in older patients. Recurrent meningiomas were more frequently found at the occipital convexity, tentorium, sellar regions, parasagittal sinus, and left sphenoid wing. Conclusion: The preferred locations of meningioma could be observed according to different biological characteristics, which might be helpful for clinical decisions.

Project description:BackgroundAgeing in Place is the emerging social policy drive for long-term care coordination of older persons globally. This decision may be the only viable option in many low- and middle-income countries like Nigeria. Nevertheless, the risk of older persons being 'stuck in place' is high if their preferences are not considered or other alternatives are neither acceptable nor available. This study determined factors associated with the preferred care setting among community-dwelling older persons and explored their views about their choices.MethodsThe study utilised a mixed-methods approach. Participants were older persons (≥ 60 years) in a selected rural and urban community in Oyo State, south-western Nigeria. Quantitative data were collected using an interviewer-administered, semi-structured questionnaire and analysed using Stata version 14 at p<0.05. Qualitative data collection involved 22 Focus Group Discussions (FGD). The discussions were audiotaped, transcribed verbatim and analysed thematically using ATLAS.ti version 8. Selected quotations were used to illustrate themes.Results1,180 participants (588 rural vs 592 urban) were interviewed with a mean age of 73.2 ±9.3 years. More rural participants preferred to AIP (61.6%) compared to urban participants (39.2%), p = 0.001. Factors associated with the decision for rural participants were older age [OR:2.07 (95%CI:1.37-3.14)], being male [OR:2.41(95%CI:1.53-3.81)] and having assistance at home [OR:1.79 (95%CI:1.15-2.79)]. In comparison, significant factors for urban participants were older age (≥70years) [OR:1.54(95%CI:1.03-2.31)] and home-ownership [OR:5.83 (95%CI:3.82-8.91)]. The FGD revealed that the traditional expectation of reciprocity of care mostly influenced the desire to AIP. Advantages include improved social connectedness, quality of care, community participation and reduced isolation. Interestingly, participants were not opposed to the option of institutional care.ConclusionAgeing in place is preferred and influenced by advanced age and home ownership in our setting. Information provided could guide age-friendly housing policies and community-based programmes for the care of older persons.

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Place field assembly distribution encodes preferred locations.

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Place field assembly distribution encodes preferred locations.

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