Stroop task
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Stroop Task. Wisconsin Card Sorting Task. Following a rule. Attention. Error based learning. PFC. DLPFC inputs: primary sensory, mostly dorsal stream. VLPFC inputs: Multimodal inputs from the STS. Some ventral stream inputs. OFC inputs: VTA Amygdala, hippocampus & thalamus.

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Stroop Task

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Stroop task

Stroop Task


Stroop task

Wisconsin Card Sorting Task


Stroop task

  • Following a rule

  • Attention

  • Error based learning


Stroop task

PFC

DLPFC inputs:

  • primary sensory, mostly dorsal stream.

VLPFC inputs:

  • Multimodal inputs from the STS.

  • Some ventral stream inputs.

OFC inputs:

  • VTA

  • Amygdala, hippocampus & thalamus

Heavy input from VTA carrying dopamine signal.

Many interareal connections.

DLPFC projects to:

  • Supplemental Motor Area (SMA)

  • Cingulate

  • Primary Motor Area (M1)

  • Cerebellum

  • SC

  • FEF


Stroop task

SEF

Dorsomedial frontal lobe

Highly connected to FEF and very similar.

  • Projects to the caudate, SC and brainstem just like FEF.

  • Fewer intracortical connections then FEF. Mainly LIP and MST.

    Mainly dorsal stream input, not much ventral

Far more connected with Cingulate then FEF

Low level stimulation evokes saccades and neurons have saccade related activity

Visual cells:

  • Slower

  • Less consistent

Delay cells:

  • Fewer

  • Slower

  • More multimodal

Delay saccade:

  • Slower

  • Less accurate

Presaccadic:

  • Same

Postsaccadic:

  • Earlier

Stimulation generates a single saccade not a series

SEF has eye position dependant activity

SEF alone cannot generate saccades


Stroop task

SEF

SEF

FEF


Stroop task

Anterior Cingulate Cortex (ACC)

Very heterogeneous area including gross morphology and cytoarchitecture

Dense connections with motor cortex and DLPFC

  • Implies a integration of cognition and action

  • Allows DLPFC to influence motor output

Inputs from thalamus, VTA & indirect input from amygdala

ACC has dense reciprocal connectivity with SEF

Lesions:

  • Inability to initiate movement

  • Suppress externally triggered motor subroutines.

Single unit activity:

  • Error

  • Rewards

  • Action Initiation

  • Combinations

FMRI activity:

  • Monetary gains/losses

  • Emotional decision

  • Conflict

Stimulation:

  • Causes movement (eyes)

  • Monkey calls.


Stroop task

Anterior Cingulate Cortex (ACC)


Stroop task

Early PET study found major activation of ACC during Stroop task.

Any task in which there was allot of cognitive “conflict” or increasing task difficulty

Most ACC activation was accompanied by PFC activation

Two theories emerged: Conflict detection and Error detection


Stroop task

Conflict theory

Starts from a an idea about how the brain works: Control theory

That there are conflicting streams of information in the brain that must be managed or controlled.

Thus, you need some module to monitor conflict so it can be managed.

ACC is active during high conflict tasks like the stroop test and go/no-go tasks.

ACC is also active when errors are made: well this is a conflict between the correct and incorrect response.


Stroop task

Error theory

Starts from an physiological observation: The error-related negativity (ERN)

The ERN is an event related potential (ERP) which is an average of electroencephalogram or EEG aligned to some event.

With the onset of an erroneous choice or the revelation of an erroneous choice there is a larger negativity in the EEG that is generated by the ACC.

They also have a host of imaging studies showing that the ACC singles errors.


Stroop task

Schall’s Countermanding task

Test subjects ability to control a movements initiation by periodically presenting a stop signal during reaction time task.


Stroop task

Schall’s Countermanding task

Probability that you wont cancel increases with stop signal delay.

Short latency saccades are less likely to be canceled because the stop single does not have time to influence the system.

Competition between a GO and a STOP signal.

The stop-signal reaction time (SSRT) is the time required to cancel a sccade


Stroop task

Schall’s Countermanding task

Movement cells began to build to threshold but on canceled trials collapsed.

Fixation cells are active after fixation and pause during the saccade.

Decrease until the stop signal and then begin to rise on canceled trials.


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