Posner Cueing Task

Version: v1 (current)

A spatial attention paradigm measuring the costs and benefits of attentional orienting through valid and invalid spatial cues.

Overview

The Posner Cueing task (also called the Posner Spatial Cueing paradigm) is a foundational method for studying visual attention. A cue indicates where a target is likely to appear (left or right side). On most trials, the cue correctly predicts the target location (valid cue); on some trials, it incorrectly predicts (invalid cue); sometimes no directional information is provided (neutral cue).

Response times reveal attention's spatial selectivity: validly cued targets are detected faster (benefit), while invalidly cued targets are detected slower (cost), demonstrating that attention can be oriented to specific spatial locations before a target appears. The paradigm is central to understanding how attention enhances processing at attended locations.

This task is used extensively in cognitive neuroscience, clinical assessment of attention disorders, and studies of spatial neglect, ADHD, and aging.

Scientific Background

Classic Findings:

• Cue Validity Effect: Valid cues produce 20-50ms RT benefit; invalid cues produce 20-80ms RT cost
• Facilitation Effect: Neutral RT - Valid RT (benefit of spatial cueing)
• Cost Effect: Invalid RT - Neutral RT (cost of reorienting from invalid location)
• Covert Attention: Attention shifts without eye movements

Key Mechanisms:

• Attentional Spotlight: Enhanced processing at attended location, reduced at unattended locations
• Disengagement Cost: Time needed to disengage from invalid cue location and reorient

Seminal Papers:

• Posner, M.I. (1980). Orienting of attention. Quarterly Journal of Experimental Psychology, 32(1), 3-25.
• Posner, Snyder, & Davidson (1980). Attention and the detection of signals. Journal of Experimental Psychology: General, 109(2), 160-174.

Why Researchers Use This Task

1. Attention Research: Study mechanisms of spatial attention and orienting
2. Clinical Assessment: Evaluate attention deficits in ADHD, neglect, and brain injury
3. Aging Studies: Track age-related changes in attentional control and orienting
4. Cognitive Neuroscience: Map neural correlates of attention with EEG/fMRI
5. Pharmacology: Test effects of drugs on attention (e.g., stimulants, sedatives)

Configuration Options

Response Mode

Parameter	Type	Default	Description
Time-based trials	boolean	True	If enabled, trials auto-advance after timeout; if disabled, participant must respond via button

Visual Settings

Parameter	Type	Default	Description
Font size	number	48	Font size for cue and target symbols (8-400 pixels)
Box size	number	80	Size of left/right placeholder boxes (20-200 pixels)
Box separation	number	300	Distance between left and right boxes (100-800 pixels)

Practice Trials

Parameter	Type	Default	Description
Enable practice	boolean	False	Show practice trials with visual feedback before main trials
Practice trials	array	[]	Array of practice trial configurations

Keyboard Shortcuts

Researchers can customize the keyboard bindings used during the task:

Parameter	Type	Default	Description
Show keyboard hint	boolean	True	Display an on-screen hint showing the configured keys
Left key	key	Arrow Left (←)	Key for left target location
Left action label	text	"Left"	Label shown in the keyboard hint for the left key
Right key	key	Arrow Right (→)	Key for right target location
Right action label	text	"Right"	Label shown in the keyboard hint for the right key

Trial Configuration

Each trial is defined in the Trials spreadsheet with the following columns:

Column	Description	Example Values
cue_type	Relationship between cue and target	Valid, Invalid, Neutral
target_location	Where the target appears	Left, Right
cue_location	Where the cue appears	Left, Right, Center (auto-set if not specified)
block	Optional grouping label	Main, Block 1
fixation_ms	Fixation cross duration before cue	500
cue_duration_ms	How long the cue is displayed	100
soa_ms	Stimulus Onset Asynchrony (cue onset to target onset)	400
target_duration_ms	Target display duration or response timeout	2000
iti_ms	Inter-trial interval after response	1000

Note: The cue_location is automatically determined from cue_type and target_location if not specified:

• Valid cue: cue location = target location
• Invalid cue: cue location = opposite of target location
• Neutral cue: cue location = center

Example Trials

Standard protocol (80% valid, 20% invalid):

| cue_type | target_location | cue_location | fixation_ms | cue_duration_ms | soa_ms | target_duration_ms | iti_ms |
|----------|-----------------|--------------|-------------|-----------------|--------|-------------------|--------|
| valid    | left            | left         | 500         | 100             | 400    | 2000              | 1000   |
| valid    | right           | right        | 500         | 100             | 400    | 2000              | 1000   |
| valid    | left            | left         | 500         | 100             | 400    | 2000              | 1000   |
| valid    | right           | right        | 500         | 100             | 400    | 2000              | 1000   |
| invalid  | left            | right        | 500         | 100             | 400    | 2000              | 1000   |
| neutral  | right           | center       | 500         | 100             | 400    | 2000              | 1000   |

Practice Trials

The task supports three practice modes:

• None: Task begins directly with main trials
• Optional: Practice trials available; participant can skip after any trial
• Mandatory: Practice trials must be completed before main trials

During practice, participants receive visual feedback after each response (green checkmark for correct, red X for incorrect).

Participant Experience

Trial Sequence

1. Main Instructions: Overview of the task and cue system
2. (Optional) Practice Instructions: If practice enabled
3. (Optional) Practice Trials: With visual feedback
4. (Optional) Trials Instructions: Shown before main trials
5. Main Trials: Each trial follows this sequence:
   • Fixation cross (+) appears at center (if fixation_ms > 0)
   • Cue appears (arrow pointing left/right or centered symbol)
   • Brief blank period (SOA - cue duration)
   • Target (*) appears in left or right box
   • Participant presses left or right arrow key
   • Brief inter-trial interval before next trial

Response Methods

Keyboard (recommended):

• Press Left Arrow Key (←) when target appears on left (default -- configurable by researcher)
• Press Right Arrow Key (→) when target appears on right (default -- configurable by researcher)

Buttons (if time-based mode disabled):

• Click "Left" or "Right" button

All keyboard bindings are configurable by the researcher in the study configuration. The keys listed above are the defaults.

Data Output

Markers and Responses

Markers (cue_shown):

{
  "type": "cue_shown",
  "ts": "2024-01-01T00:00:01.000Z",
  "hr": 1234.56,
  "data": {
    "trial_index": 1,
    "stimulus_id": "posner_cueing_0_1",
    "cue_type": "invalid",
    "cue_location": "right",
    "target_location": "left",
    "block": "main"
  }
}

Markers (target_shown):

{
  "type": "target_shown",
  "ts": "2024-01-01T00:00:01.400Z",
  "hr": 1634.56,
  "data": {
    "trial_index": 1,
    "stimulus_id": "posner_cueing_0_1",
    "cue_type": "invalid",
    "cue_location": "right",
    "target_location": "left",
    "expected_response": "left",
    "block": "main"
  }
}

Response Data:

{
  "trial_index": 1,
  "stimulus_id": "posner_cueing_0_1",
  "source": "keyboard",
  "raw_key": "ArrowLeft",
  "cue_type": "invalid",
  "cue_location": "right",
  "target_location": "left",
  "expected_response": "left",
  "response_value": "left",
  "correct": true,
  "latency_ms": 512,
  "ts": "2024-01-01T00:00:01.912Z",
  "hr": 2146.56
}

Summary Artifact

A JSON file (posner_cueing_summary_<taskIndex>.json) with comprehensive statistics:

{
  "task_kind": "posner_cueing",
  "total_trials": 60,
  "overall": {
    "accuracy": 0.97,
    "mean_rt_ms": 378,
    "mean_correct_rt_ms": 372
  },
  "by_cue_type": {
    "valid": {
      "total": 48,
      "accuracy": 0.98,
      "mean_correct_rt_ms": 345
    },
    "invalid": {
      "total": 10,
      "accuracy": 0.94,
      "mean_correct_rt_ms": 412
    },
    "neutral": {
      "total": 2,
      "accuracy": 0.97,
      "mean_correct_rt_ms": 378
    }
  },
  "cueing_effects": {
    "validity_effect_ms": 67,
    "facilitation_effect_ms": 33,
    "cost_effect_ms": 34
  },
  "trials": [ /* per-trial data */ ]
}

Key metrics:

• validity_effect_ms: Invalid RT - Valid RT (total cueing effect)
• facilitation_effect_ms: Neutral RT - Valid RT (benefit of valid cue)
• cost_effect_ms: Invalid RT - Neutral RT (cost of invalid cue)

Instructions

The task uses a four-tier instruction system:

1. Main Instructions: Shown on a dedicated page before the task begins
2. Practice Instructions: Shown before practice trials (if practice enabled)
3. Trials Instructions: Shown before main trials after practice (if practice enabled)
4. Hint Instructions: Quick-reference help available via "?" button during task

All instruction text can be customized in rich-text format during study configuration.

Design Recommendations

Trial Design

Standard cueing protocol (recommended):

• 80% valid trials (cue correctly predicts target location)
• 20% invalid trials (cue predicts opposite location)
• Optional: 10-20% neutral trials (no directional cue)
• Equal left and right target locations
• Randomize trial order to prevent anticipation

Minimum for reliable effects:

• 40 valid trials
• 10 invalid trials
• Total: 50+ trials

Timing Guidelines

Parameter	Standard	Short SOA	Long SOA
Fixation (ms)	500ms	400ms	600ms
Cue Duration (ms)	100ms	100ms	100ms
Soa (ms)	300-400ms	100-200ms	700-1000ms
Target Duration (ms)	2000ms	1500ms	2500ms

Note: SOA (Stimulus Onset Asynchrony) is the time from cue onset to target onset. The cue-target gap = SOA - cue duration.

Practice Trials

Include 12-16 practice trials:

• Mix valid, invalid, and neutral trials (matching main trial proportions)
• Equal left and right targets
• Provide feedback so participants learn the cue-target relationship
• Emphasize that cue is helpful but not always correct

Cue Validity

High validity (80% valid) is standard:

• Ensures participants use the cue
• Produces reliable validity effects
• Can increase to 85-90% for stronger effects

Balanced validity (50% valid):

• No predictive value (participants may ignore cue)
• Useful for clinical populations or control conditions
• Reduces expectancy effects

SOA Manipulation

• Short SOA (100-200ms): Reflexive attention, small effects
• Medium SOA (300-500ms): Optimal for voluntary attention, largest effects
• Long SOA (700-1000ms+): May produce inhibition of return (IOR) - slower RTs to validly cued locations

Common Issues and Solutions

No Validity Effect Observed

Problem: Invalid and valid RTs are similar

Possible causes:

• Cue validity too low (participants ignore cue)
• SOA too short or too long
• Participants not maintaining central fixation

Solutions:

• Increase cue validity to 85-90%
• Use medium SOA (300-500ms)
• Emphasize importance of cue in instructions
• Consider eye-tracking to verify fixation

High Error Rate (>10%)

Problem: Many incorrect responses

Possible causes:

• Task instructions unclear
• Target too brief or small
• Response mapping confusion

Solutions:

• Extend practice with clearer instructions
• Increase target visibility (larger boxes, longer duration)
• Verify participants understand left/right arrow key mapping

Anticipatory Responses (<150ms)

Problem: Participant responding before target appears

Solutions:

• Vary fixation duration randomly (jitter)
• Add catch trials (no target appears)
• Provide RT feedback during practice
• Exclude anticipatory responses from analysis

Keyboard Responses Not Working

Problem: Arrow keys don't register

Solutions:

• Ensure task window has focus (click on task area)
• Check browser compatibility (works best in Chrome/Edge/Firefox)
• Use button-based mode as alternative

Population-Specific Adaptations

Children (8+ years)

• Simpler cues (bright colored arrows)
• Larger boxes and targets
• Shorter sessions (40-50 trials)
• Longer SOA (400-500ms) to accommodate slower processing
• Button-based mode may be easier than arrow keys
• Emphasize "cue helps but isn't perfect" in instructions

Older Adults (65+)

• Larger targets and cues (increase box size and font size)
• Longer SOA (400-500ms) for slowed processing
• High-contrast stimuli (black on white)
• Self-paced mode (no time pressure)
• May show larger validity effects (difficulty disengaging from invalid cues)

Clinical Populations

• Hemispatial Neglect: Use 50% valid (no predictive value) to assess left/right asymmetry
• ADHD: May show reduced cueing benefits or increased errors
• Brain Injury: Adapt timing based on processing speed
• Consider eye-tracking to verify covert attention (fixation maintained)

References

• Posner, M. I. (1980). Orienting of attention. Quarterly Journal of Experimental Psychology, 32(1), 3-25.
• Posner, M. I., Snyder, C. R., & Davidson, B. J. (1980). Attention and the detection of signals. Journal of Experimental Psychology: General, 109(2), 160-174.
• Klein, R. M. (2000). Inhibition of return. Trends in Cognitive Sciences, 4(4), 138-147.
• Theeuwes, J. (2010). Top-down and bottom-up control of visual selection. Acta Psychologica, 135(2), 77-99.

See Also

• Flanker Task - Related selective attention paradigm
• Pro/Antisaccade - Oculomotor control task
• Visual Search - Spatial attention with multiple items