Protocol

Mouse unbiased visual contrast wheel task

Head-fixed mice report the side of a visual contrast stimulus with a response wheel in sessions without an explicit blockwise prior manipulation. The task isolates contrast and stimulus side as the primary decision variables.

Task structure

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

Stimulus

evidence_schedule
A grating or similar visual stimulus appears on one side with contrast sampled across trials.
evidence_type
static
modalities
visual
notes
—
units
percent contrast
variables
contrast, stimulus side

Choice

action_mapping
Wheel movement reports the side of the stimulus, usually by moving the stimulus toward a response position.
alternatives
left, right
choice_type
2afc
notes
—
response_modalities
wheel

Feedback

feedback_type
mixed
notes
—
penalty
Auditory or timeout penalty for incorrect choices, source-dependent.
reward
Water reward for correct choices.

Training

notes
—
stages
wheel shaping, visual discrimination

Trial timing

  1. quiescence
    protocol-specific

    Mouse holds the wheel still before stimulus onset.

  2. stimulus_and_response
    response-limited

    Visual stimulus remains available during the response period.

  3. feedback
    outcome-dependent

Vertical slices

Expected analyses

  • psychometric curve by contrast
  • chronometric curve by contrast
  • lapse, bias, and threshold estimates

Interpretive claims

  • perceptual decision-making
    Confidence: medium · ref.ibl-2021-standardized

Open questions

  • Decide whether this should be modeled as a variant of the IBL protocol or a separate record.
  • Decide how to represent the broader multi-session training trajectory beyond the current single-session slice.