Protocol

Classic macaque random-dot motion discrimination

Non-human primates discriminate the net direction of motion in a stochastic random-dot display. Motion coherence controls sensory evidence strength and choices are commonly reported with eye movements or other trained responses.

Task structure

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

Stimulus

evidence_schedule: A fraction of dots move coherently in one direction while the remainder move stochastically; coherence varies across trials.
evidence_type: stochastic-motion
modalities: visual
notes: —
units: percent coherence, degrees
variables: motion coherence, motion direction, stimulus duration

Choice

action_mapping: Choice is mapped to one of two motion-direction alternatives, often using target-directed saccades after stimulus presentation.
alternatives: direction A, direction B
choice_type: 2afc
notes: —
response_modalities: saccade

Feedback

feedback_type: reward
notes: —
penalty: —
reward: Juice or fluid reward for correct decisions in trained animals.

Training

notes: Training details vary substantially across laboratories.
stages: fixation training, motion discrimination training

Trial timing

fixation

protocol-specific

Subject maintains fixation before stimulus onset.
motion_stimulus

fixed or response-dependent, protocol-specific

Random-dot motion evidence is shown.
choice

protocol-specific

Subject reports the judged motion direction.
feedback

outcome-dependent

Vertical slices

Random-Dot Motion available

Expected analyses

psychometric curve by motion coherence
chronometric curve where reaction times are available
neurometric-psychometric comparison where neural recordings are available

Interpretive claims

perceptual decision-making

Confidence: high · ref.britten-1992-motion

Open questions

Decide whether human keyboard/button RDM tasks should be separate protocol records.
Add canonical parameter ranges only after source-specific curation.

Papers

Roitman JD, Shadlen MN. Response of neurons in the lateral intraparietal area during a combined visual discrimination reaction time task. Journal of Neuroscience, 2002, 22(21):9475-9489. (2002)

Findings

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

Roitman JD, Shadlen MN. Response of neurons in the lateral intraparietal area during a combined visual discrimination reaction time task. Journal of Neuroscience, 2002, 22(21):9475-9489. · chronometric processed-trial
Roitman JD, Shadlen MN. Response of neurons in the lateral intraparietal area during a combined visual discrimination reaction time task. Journal of Neuroscience, 2002, 22(21):9475-9489. · chronometric processed-trial
Roitman JD, Shadlen MN. Response of neurons in the lateral intraparietal area during a combined visual discrimination reaction time task. Journal of Neuroscience, 2002, 22(21):9475-9489. · chronometric processed-trial
Roitman JD, Shadlen MN. Response of neurons in the lateral intraparietal area during a combined visual discrimination reaction time task. Journal of Neuroscience, 2002, 22(21):9475-9489. · psychometric processed-trial
Roitman JD, Shadlen MN. Response of neurons in the lateral intraparietal area during a combined visual discrimination reaction time task. Journal of Neuroscience, 2002, 22(21):9475-9489. · psychometric processed-trial
Roitman JD, Shadlen MN. Response of neurons in the lateral intraparietal area during a combined visual discrimination reaction time task. Journal of Neuroscience, 2002, 22(21):9475-9489. · psychometric processed-trial

See all findings overlaid on shared axes.