> ## Documentation Index
> Fetch the complete documentation index at: https://api.thesapientcompany.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Data layers

> The layers of data a scan can return, from the raw brain response to a one-line summary.

A scan can answer at different depths. The same response can be returned as a precise, cortex-wide brain signal, or as a single sentence. You choose the layer that fits the question, and pay attention to how much detail you actually need.

The layers run from **deepest** (most precise, least readable) to **simplest** (most readable, least detailed).

## The layers

<ResponseField name="Per-vertex fMRI" type="deepest">
  The full predicted brain response: activity across roughly 20,000 points on the cortex, for every moment of the content. This is the ground truth. Use it for research, custom modeling, or when you need the unreduced signal.
</ResponseField>

<ResponseField name="Per-second networks" type="layer 2">
  The cortex-wide response summarized into the 7 brain networks, one value each, every second. Use it to understand *why* the content performs the way it does, and which systems are firing when.
</ResponseField>

<ResponseField name="Per-second lens scores" type="layer 3">
  The 4 lenses tracked second by second. Use it to see how attention, memory, desire, and manipulation move across the timeline of your content.
</ResponseField>

<ResponseField name="Moments" type="layer 4">
  The notable points: the peaks and drops. The seconds where attention spiked, emotion landed, or interest fell off a cliff. Use it to find the exact moments worth keeping or cutting.
</ResponseField>

<ResponseField name="Summary" type="simplest">
  The headline read: overall score, grade, and a top-line take on each lens. Use it for a fast verdict or to compare versions at a glance.
</ResponseField>

## When to use each

<Columns cols={2}>
  <Card title="Need a fast verdict?">
    Use the **summary**. Score, grade, and lens headlines are enough to compare A vs B or sanity-check before you spend.
  </Card>

  <Card title="Need to find the fix?">
    Use **moments**. Jump straight to the second where attention drops or emotion peaks.
  </Card>

  <Card title="Need the full timeline?">
    Use **per-second lens scores** to see how every lens rises and falls across the content.
  </Card>

  <Card title="Need to know why?">
    Use **per-second networks** to trace a result back to the brain systems driving it.
  </Card>
</Columns>

<Card title="Per-vertex fMRI">
  For research and custom modeling, request the unreduced cortex-wide response, the layer everything else is built from.
</Card>