Late Posterior Positivity
Late Posterior Positivity - Related Videos
08:44
The Utility of Stage-specific Mid-to-late Drosophila Follicle Isolation
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Cited by 12 •
2013
Stage-specific isolation of mid-to-late Drosophila follicles is useful for a variety of purposes. Such follicles develop in culture, which allows for genetic and/or pharmacologic manipulations to be coupled with in vitro development assays and live imaging. Additionally, follicles can be used for molecular studies, such as isolating mRNA and protein.
08:15
Measuring Left Ventricular Pressure in Late Embryonic and Neonatal Mice
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Cited by 18 •
2012
Measuring left ventricular pressure (LV) in embryonic and neonatal mice is described. Pressure is measured by inserting a needle connected to a fluid-filled transducer into the LV under ultrasound guidance. Care must be taken to maintain normal cardiac function during the experimental protocol.
15:12
Primary Neuronal Cultures from the Brains of Late Stage Drosophila Pupae
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Cited by 19 •
2007
This video demonstrates the preparation of primary neuronal cultures from the brains of late stage Drosophila pupae. Views of live cultures show neurite outgrowth and imaging of calcium levels using Fura-2.
07:59
Bioluminescence Imaging to Detect Late Stage Infection of African Trypanosomiasis
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Cited by 3 •
2016
This manuscript describes the use of a bioluminescent strain of African trypanosomes to enable the tracking of late stage infection and demonstrates how in vivo live imaging can be used to visualize infections within the central nervous system in real-time.
06:40
G2-seq: A High Throughput Sequencing-based Technique for Identifying Late Replicating Regions of the Genome
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2018
We describe a technique for combining flow cytometry and high throughput sequencing to identify late replicating regions of the genome.
FAQs
Its amplitude and timing can vary with the task and the stimulus context, because these factors shape later-stage evaluation. Attention may alter how strongly information is allocated for further processing, while emotional significance or memory demands may change the evoked response. Interpretation therefore requires considering what participants viewed and what the task required, rather than treating the component as context-independent.
Amplitude indicates the strength of the stimulus-evoked positive shift, whereas timing indicates when the later response develops after stimulus presentation. Together, these measures help researchers characterize differences in later evaluation across tasks or stimulus types. They are most informative when interpreted alongside the experimental context, since the same component can reflect attention, emotional significance, or memory processing depending on the study.
Its later occurrence helps researchers distinguish stimulus-related activity associated with later cognitive operations from earlier sensory responses. This temporal distinction is valuable in event-related potential studies because a stimulus can first generate an early response and later engage evaluation, attention allocation, or memory-related processing. The component therefore contributes to a time-resolved account of how the brain handles information.
The component does not have one fixed psychological interpretation across all experiments. Its amplitude and timing reflect stimulus-evoked activity during later-stage evaluation, but the relevant process may involve attention, emotional significance, or memory depending on the design. Linking the measured response to the task and stimuli helps researchers make a more precise inference about the cognitive operation being examined.
Researchers record electroencephalography while presenting stimuli, then examine the positive voltage shift that follows each presentation over posterior scalp regions. The analysis focuses on when the response occurs and how large its amplitude becomes. Comparing these features across tasks or stimulus contexts allows investigators to characterize differences in later evaluation and information allocation without reducing the result to an early sensory response.
It can help address how the brain allocates attention and evaluates information after a stimulus has been presented. Investigators may use amplitude and timing to compare later processing across tasks or stimulus contexts involving attention, emotional significance, or memory. This makes the component useful for studying how neural activity progresses from initial sensory registration toward later cognitive evaluation.