Protocol

Human random-dot motion button reaction-time task

Human observers judge the dominant direction of motion in a random-dot kinematogram and report the decision with a button or keyboard response. Motion coherence controls stimulus strength and reaction time is a primary dependent measure.

Task structure

Stimulus, choice, feedback, and training as declared in the protocol record.

Stimulus

evidence_schedule
Dot motion coherence varies across trials; speed-accuracy instructions or stimulus strength can be manipulated across blocks.
evidence_type
stochastic-motion
modalities
visual
notes
—
units
percent coherence
variables
motion coherence, motion direction, stimulus duration

Choice

action_mapping
Button or key identity maps to the judged motion direction.
alternatives
direction A, direction B
choice_type
2afc
notes
—
response_modalities
button-press, keyboard

Feedback

feedback_type
none
notes
Feedback and speed-accuracy instruction are source-dependent.
penalty
—
reward
—

Training

notes
—
stages
instructions, practice trials

Trial timing

  1. fixation
    protocol-specific

    Observer fixates before stimulus onset.

  2. motion_stimulus
    fixed or response-dependent, protocol-specific

    Random-dot motion evidence is shown.

  3. response
    response-limited

    Observer reports the judged motion direction.

Vertical slices

Expected analyses

  • psychometric curve by motion coherence
  • chronometric curve by motion coherence
  • drift-diffusion model fit

Interpretive claims

  • perceptual decision-making
    Confidence: high · ref.palmer-huk-shadlen-2005

Open questions

  • Add speed-accuracy instruction fields if original block annotations are recovered.
  • Decide whether fixed-duration and reaction-time RDM should be separate records.

Papers

Findings

Curves attached to this protocol on shared signed-evidence axes.

See all findings overlaid on shared axes.