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Area of Interest Hit Analyzer

The Area of Interest (AOI) Hit Analyzer performs epoch-based analyses of prescored AOI hit data.

Table of contents
  1. Introduction
  2. User Corrections
  3. Settings
  4. Metrics
  5. Resampled Signals

Introduction

The Area of Interest Hit Analyzer visualizes pre-classified hit data inside an eye-tracking dataset, and performs epoch-based descriptive analysis or resampling. AOI hit data consists of an AOI name, and the start and end times of the hits. The Toolbox itself cannot score AOI hits based on gaze coordinates.

Area of Interest Hit Analyzer
Figure 1: The Area of Interest Hit GUI, showing the hit data per AOI. In the current file there were four AOIs. Notice that the EXP_AOIEyes AOI was hit most frequently.

User Corrections

The Area of Interest Hit Analyzer does not allow for corrections to be made.

Settings

The auto-generated list below shows the settings available in the Area of Interest Hit Analyzer module:

  • General Settings:
    Name, source and epoch settings for this PhysioAnalyzer.

    • Analyzer prefix (tag):
      The tag (name) of this PhysioAnalyzer. The tag must be unique and start with a letter, and may only contain alphanumeric characters.

    • Eye-Tracking dataset number:
      The channel number (index) of the signal to be analyzed.

    • Generate epochs from:
      Specifies how epochs are generated.

Metrics

The auto-generated table belows lists all the metrics produced by the Area of Interest Hit Analyzer module.

Table 1: The metrics calculated by the Area of Interest Hit Analyzer module.

Variable: Unit: Description:
AOI_Total_Hit_Time s The total cumulative hit time in the AOI (AOI), per epoch.
AOI_Time_to_First_Hit s The time from the start of the epoch to the first hit in the AOI (AOI), per epoch. Is zero if the epoch started during a hit, blank/NaN if the epoch did not feature any hits.
AOI_First_Hit_Duration s The duration of the first hit in the AOI (AOI), per epoch. If the epoch started or ended while a hit, was active, only the duration during the epoch is considered.
AOI_Hit_Count - The total distinct times that the AOI (AOI) was hit, per epoch.

Resampled Signals

When exporting the resampled epoch signals, the AOI Hit Analyzer resamples and extracts the AOI hits. This results in a hit fraction per bin indicating the fraction of the bin the AOI was hit (0 = no hit, 1 = complete hit).

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