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Abstract The functional and anatomical organization of the cingulate cortex across primate species is the subject of considerable and often confusing debate. The functions attributed to the midcingulate cortex (MCC) embrace, among others, feedback processing, pain, salience, action-reward association, premotor functions, and conflict monitoring. This multiplicity of functional concepts suggests either unresolved separation of functional contributions or integration and convergence.

We here provide evidence from recent experiments in humans and from a meta-analysis of monkey data that MCC feedback-related activity is generated in the rostral cingulate premotor area by specific body maps directly related to the modality of feedback. As such, we argue for an embodied mechanism for adaptation and exploration in MCC. We propose arguments and precise tools to resolve the origins of performance monitoring signals in the medial frontal cortex, and to progress on issues regarding homology between human and nonhuman primate cingulate cortex. ,, Introduction Primates show a remarkable ability to adapt in the face of rapidly changing environments. Evaluation of decisions and of their outcomes, so-called performance monitoring, lies at the heart of such abilities.

The search for computational and neurobiological principles of performance monitoring has been fruitful in the last 30 years, largely due to parallel research in rodents, monkeys, and humans (reviewed in;;; ). Several studies have highlighted one subdivision of the cingulate cortex, the midcingulate cortex (MCC), as a central element of the performance monitoring network (;; ). Understanding the specific contribution of the MCC is an important challenge because of its putative key role in several aspects of human cognition, its association to a wide range of pathological conditions () and, also, because physiological activity in parts of the cingulate cortical region might serve as markers of developmental and individual behavioral traits (). In the search for MCC functions, discrepancies between human and monkey studies, and between functional and lesion data (;; ), have fueled debates on the exact contribution of this subdivision and, to some extent, on the validity of the nonhuman primate as a model of human cingulate functions (; ). The debates have confronted multiple anatomical definitions of cingulate areas, as well as different functional interpretations of data obtained with multiple techniques. Important theoretical attempts have been made to integrate various pools of data (; ).

However, we think that it is essential to clarify the fundamental issues in comparing empirical data obtained in humans and monkeys. These are the precision of anatomical descriptions and the experimental equivalence. In particular, the provision of juice reward and reward omission are central to the study of decision making in animals. Pocsag Decoder Software For Windows more. The computational basis of adaptation relies on teaching signals that have been mostly studied using juice with animals. Juice reward and feedback must thus be taken into account as such when comparing human and monkey brain functions. In the present contribution, we specifically address the issue of functional homology between human and monkey MCC, and its functional organization. To achieve this, we first deal with some difficulties in the anatomical and functional subdivisions of the cingulate region in the 2 species.

Second, we show that the functional organization of the human MCC for juice feedback follows a systematic rule. The studies had 2 crucial constraints: behavioural protocols in human functional studies that are similar to those used in monkeys; and parsing the results on the basis of human interindividual morphological variability. Finally, we perform a meta-analysis of cingulate feedback-related unit activity in monkey to show a functional homology with human anterior MCC. This approach then allows us to discuss a possible functional organization principle in MCC, and to provide testable hypotheses. Overview of Cingulate Cortical Organization in Primates Part of the confusion in the functional definition of MCC arose from the multiplicity of labels naming subdivisions of the cingulate cortex (; ).

It has become virtually impossible to understand what part of the medial frontal cortex is referred to when one uses the label anterior cingulate cortex (ACC). The label dorsal ACC (dACC) emerged in an attempt to reduce confusion, but it is based only on a rough estimate from brain imaging studies. Use of a common and consistent terminology is mandatory for further progress in this field. The regional model proposed by Vogt et al. Is to date the clearest and most rigorous. It is based on multidimensional mappings in human and nonhuman species, including nonhuman primates (,;; ). The model describes 4 cingulate regions among which the most anterior is labeled ACC (See Fig. ).

The region just posterior, dorsal to the corpus callosum, is the MCC (mostly equivalent to dACC) with its most anterior part (aMCC) being the subject of the present study. Schematic representations of the ACC and MCC region in the human ( A, B) and macaque ( C) brains according to Vogt et al.

Overlap on brain anatomical scans average in MNI standard spaces for both species. The regions ACC, MCC, PCC, and RSC are based on the 4 regions subdivision by Vogt et al. The human representations schematize the organization of cingulate subdivisions in the case of absence ( A) or presence ( B) of the paracingulate sulcus. Area 32′ and a24c′ were defined by the same authors. In A, the schematic limits of anterior and posterior MCC (aMCC and pMCC) are shown. In C, the schematic position of cingulate motor areas (CMAr, CMAd, CMAv) are presented as in. Schematic representations of the ACC and MCC region in the human ( A, B) and macaque ( C) brains according to Vogt et al.

Overlap on brain anatomical scans average in MNI standard spaces for both species. The regions ACC, MCC, PCC, and RSC are based on the 4 regions subdivision by Vogt et al. The human representations schematize the organization of cingulate subdivisions in the case of absence ( A) or presence ( B) of the paracingulate sulcus.

Area 32′ and a24c′ were defined by the same authors. In A, the schematic limits of anterior and posterior MCC (aMCC and pMCC) are shown. In C, the schematic position of cingulate motor areas (CMAr, CMAd, CMAv) are presented as in. It is important to note that the cytoarchitectonic limits of the MCC appear to relate to the morphology of sulci in primates and such relationships have been in fact another important source of confusion regarding the functional organization of MCC. Based on classical cytoarchitectonic studies and their own research, Vogt et al.

Propose that the human MCC comprises cytoarchitectonic areas 24a′, 24b′, 24c′, 24d, 33′, and 32′ (, see schema Fig. According to these studies, area 32′ is always dorsal to area 24c′, but the relationship between these areas and the sulci on the medial wall is not trivial.

Specifically, this is because of individual variations in morphology. Whereas all humans possess a cingulate sulcus in each hemisphere, a double cingulate sulcus known as the paracingulate sulcus is variably present (). The paracingulate sulcus is observed in ∼70% of subjects at least in one hemisphere, and runs dorsal and parallel to the cingulate sulcus through the MCC (;; ).

A paracingulate sulcus can be observed in both hemispheres in some brains, in only one hemisphere in most cases (see ), or in neither hemisphere. Morphological variability appears clearly in surface-based standardized analyses (). The question of interest here is the relationship between these sulci and the cytoarchitecture, and although this requires further study, current understanding is depicted in Figure. Areas 32′ and 24c′ cover the dorsal and ventral banks of the cingulate sulcus in the absence of paracingulate sulcus (Fig. In contrast, area 32′ was observed in the paracingulate gyrus above the cingulate sulcus and in the paracingulate sulcus when the latter is present, with area 24c′ covering both banks of the cingulate sulcus (Fig.

In the standard stereotaxic space (MNI), as used in brain imaging experiments, the cortex lying in the paracingulate and cingulate sulci have different coordinates. This suggests that the location of area 32′ in standard space is different for the 2 types of morphology. Crucially, this means that population averaging procedures should significantly decrease the reliability of activation measures in that region, unless individual morphology is rigorously taken into account (; ). In monkeys, the cingulate cortex presents important similarities in anatomical organization with the human cingulate region. Figure C represents the subdivision of the rostral cingulate region as proposed by Vogt et al. Who studied a comparative anatomy in humans and monkeys.

The different subdivisions of the cingulate cortex are organized around the single cingulate sulcus as there is no paracingulate sulcus in macaque monkeys. This cingulate sulcus contains several cytoarchitectonnic areas that have been mostly shown to be comparable with human cytoarchitectonic subdivisions. The exceptions are areas 32′ in MCC and 33′. Earlier cytoarchitectonic studies of the macaque monkey midcingulate region had not identified area 32′, and it was attributed to the human species only (). In macaque, the 4-region model uses the fundus of the cingulate sulcus as the dorsal limit of the MCC, excluding the dorsal bank of the sulcus (). However, neuroanatomical studies from several groups observed that the cortex in the dorsal bank of the cingulate sulcus includes cingulate or transition areas (;;;;; for review ). In the human brain, the cortex above the cingulate sulcus when there is a paracingulate sulcus, that is, on the paracingulate gyrus, is a transitional dysgranular area that separates agranular cingulate cortex (classical area 24) from medial dorsal frontal areas (see, ).

The corresponding region in the macaque brain lies in the dorsal bank of the cingulate sulcus, above the anterior part of the corpus callosum (). Interestingly, the dorsal bank is where the most dorsal MCC lies in the human brain when there is only a single cingulate sulcus (; and see Fig. In conclusion, some architectonic studies suggest important primate species difference in the cingulate cortex, with a dorsal limit in monkey cingulate sulcus, supporting the theoretical argument on primate interspecies difference ().

However, based on cytoarchitectonic studies (e.g., ), this dorsal limit can be challenged. Also, as we shall see, most of the physiological recordings in monkey cingulate cortex that are compared with human functional neuroimaging data have been performed in the dorsal bank and fundus of the cingulate sulcus, that is, outside of Vogt's definition of the MCC.

In addition, the layout of cingulate motor areas (CMAs) also favors the extension of MCC onto the dorsal bank. Cingulate Motor Areas Crucially, the MCC region overlaps with or includes CMAs. The CMAs have been defined in monkeys using intracortical microstimulation, as well as by anatomical demonstration of connection to the premotor cortex, the primary motor cortex, and the spinal cord (;;;,;;; ). Cortical labeling following tracer injections in the cervical or lumbar segment of the spinal cord showed that several representations of the arm and of the lower limb are present in the cortex of the dorsal and ventral banks of the cingulate sulcus, which contrasts with a cytoarchitectonic limit in the fundus of the sulcus. Three major subdivisions were defined by Strick et al.: CMAr, CMAd, and CMAv (for rostral, dorsal, and ventral CMAs) each containing somatomotor representations (; ). It is unclear how Vogt's borders relate to motor areas on the medial wall in nonhuman primates (Fig. For instance, because the posterior representation of the limbs (in CMAd) are found in the dorsal bank of the sulcus (; ), a rigorous application of the dorsal border in the cingulate sulcus results in double arm and leg representations in the primary motor cortex and supplementary area, respectively.

Although CMAr (the main subject of this paper) is often discussed in relation to its well-known arm and hand representations, a representation of the face/eye field has also been described using experimental anatomical tract tracing and microstimulation, just anterior to the arm representation (;,; ). Further information on the rostral cingulate face representation is provided below. Until recently, the definition of human equivalents of the monkey CMAs relied mainly on the comprehensive meta-analysis by ), who provisionally identified based on positron emission tomography studies 3 subdivisions labeled anterior and posterior rostral cingulate zones (RCZa and RCZp) and a caudal cingulate zone (CCZ) that might be equivalent to the respective CMAr, CMAv, and CMAd identified in the macaque monkey. These investigators predicted the presence of face (related to studies on eye movements and speech) and arm representations in the 2 RCZ and an arm representation in the CCZ. However, no single study had ever tested such somatomotor mappings in individual human subjects paying particular attention to the sulcal morphological variability.

Have recently performed this experiment by mapping, with functional magnetic resonance imaging (fMRI) activations in the cingulate regions for eye, tongue, arm, and foot movements (). As in the monkey, they uncovered 3 cingulate motor regions, each including a focus for arm and foot movements and with the 2 anterior regions including in addition foci for movements of the eye and of the tongue. (Note that it was not possible to find a significant spatial dissociation between eye and tongue-related activations, unpublished observation.) This suggests that limb representations are present in all cingulate zones but that only the most anterior ones (RCZa and RCZp) appear to have representations of the face, including eye-related fields, although a separation between face and eye remains to be investigated.

Importantly, using a single-subject approach, it was shown that the face activations are located in the paracingulate sulcus when it is present, but in the cingulate sulcus in the absence of the paracingulate sulcus. In either case, the eye/face focus is always located at the junction of the cingulate or paracingulate sulci with a small perpendicular sulcus (Fig. Arm and foot activations were always in the cingulate sulcus. Together with the observations of displacement in the presence of a paracingulate sulcus (Fig. ), these functional data suggest that the rostral eye/face representation in aMCC is displaced in a similar way to the displacement of area 32′ described by ). A clear morphological landmark might thus be used to track the location of RCZ face area in humans and allow precise functional mappings. Human cingulate motor areas, feedback activity, and sulcal morphology.

( A) Schematic illustration of the 3 human cingulate motor areas (RCZa, RCZp, and CCZ) as described. Colored disks represent the average location of activation peaks in response to simple voluntary movements for hemispheres with (top) and without (bottom) a paracingulate sulcus.

Cs: cingulate sulcus, pcs: paracingulate sulcus. ( B) Overlap of tongue movement-related activation peaks (individual peak locations are represented by squares) and peaks for feedback-related activation (circles) during exploration for hemispheres with and without a paracingulate sulcus.

Each individual sulcus path has been retraced, and all paracingulate (blue) and cingulate (yellow) sulci, as well as vertical branches (red, green, and white), have been overlapped for the populations of subjects. Data taken from and.

Note, the activation data come from 2 separate experiments. The approximate location of RCZa, RCZp, and CCZ is indicated by ellipses (rostrocaudal extent estimated from ). Human cingulate motor areas, feedback activity, and sulcal morphology. ( A) Schematic illustration of the 3 human cingulate motor areas (RCZa, RCZp, and CCZ) as described. Colored disks represent the average location of activation peaks in response to simple voluntary movements for hemispheres with (top) and without (bottom) a paracingulate sulcus. Cs: cingulate sulcus, pcs: paracingulate sulcus. ( B) Overlap of tongue movement-related activation peaks (individual peak locations are represented by squares) and peaks for feedback-related activation (circles) during exploration for hemispheres with and without a paracingulate sulcus.

Each individual sulcus path has been retraced, and all paracingulate (blue) and cingulate (yellow) sulci, as well as vertical branches (red, green, and white), have been overlapped for the populations of subjects. Data taken from and. Note, the activation data come from 2 separate experiments. The approximate location of RCZa, RCZp, and CCZ is indicated by ellipses (rostrocaudal extent estimated from ). Feedback Evaluation and the MCC Functional data have accumulated on the role of MCC in outcome-based decisions and adaptation, in both humans and monkeys. Single-unit and local field potential recordings in the anterior section of the dorsal bank of the cingulate sulcus in monkeys have revealed particularly prominent activity related to outcome or feedback detection and evaluation (e. Right Light Center Game Labels here. g.,;;;; ). During an explore/repeat task (searching for a rewarded response and then repeat), single-unit activity has been shown to be related to the coding and discrimination of various forms of feedback relevant for adaptation (negative feedback: no reward, positive feedback: juice delivery, etc.), in particular during exploration ().

How does this relate to human MCC? Learning and decision behavioral protocols in monkeys use juice reward as feedback and incentive. Delivery or omission of reward provides the relevant information to guide behavior. Thus, a proper comparison of human and macaque studies requires the use of reward in similar ways in both species. For a direct comparison with monkey studies, we recently adapted the task used in monkey experiments, including exploration (trial and error) and repetition periods and using fruit juice as outcome or feedback, in a human fMRI protocol (). As predicted from monkey electrophysiological results, very reliable aMCC activation was observed at feedback during exploration, but not at feedback during repetition. Most importantly, the location of feedback-related activation could be related to the local sulcal morphology in the cingulate region as was the case for the location of the rostral CMA.

The feedback-related activation was located in the paracingulate sulcus when present, or in the cingulate sulcus in the absence of the secondary paracingulate sulcus. Taken together, our recent functional neuroimaging experiments in human subjects reveal organizational principles in MCC that stimulate a reconsideration of data in monkeys (; ). The data suggest that the juice feedback activations and the CMAs are related, and that this relationship could be similar in human and nonhuman primates. To address this homology issue, we proceeded in 2 ways: 1) we combined single human subject fMRI data to test the relationships between feedback-related activations and cingulate motor areas and 2) we performed a meta-analysis of monkey outcome-related and CMA-related data.

The aim was to provide a comparative assessment of the relationship between juice feedback-related activity and CMAs in the 2 species. Materials and Methods Brain Imaging Individual peaks of statistically identified clusters reported in and were plotted in the MNI standard stereotaxic space (Fig.

The course of the cingulate sulcus, paracingulate sulcus, and 3 major branching vertical sulci were drawn from single-subject T 1 sagittal views. The most posterior of the 3 vertical sulci is the paracentral sulcus (pacs), followed by the preparacentral sulcus (prpacs), and then the vertical paracingulate sulcus (vpcgs), which is the most anterior (see ). Principles of Monkey Meta-analysis We evaluated, from the literature, the location of reported outcome or feedback-related single-unit activity in relation to CMAr representations.

To do this, we performed a meta-analysis of published neurophysiological and neuroanatomical data obtained in monkeys. Our aim was to co-register, using the same anatomical reference framework, data from unit recordings, microstimulation mappings, and neuroanatomical tract tracing, and to investigate whether outcome-related activity was likely to come from recordings in CMAr/face region. Data from 26 articles were used (see ). Reconstructions of recording sites were based on the data available in those published articles. For unit recordings, the selection of articles was based on whether the investigators reported outcome-, feedback-, or more generally juice-related changes in single-unit activity and also on whether there was sufficient information to reconstruct the recording zone. The recording zone retained for analysis corresponds, for each article, to the entire extent of recordings that included outcome- or feedback-related activity.

Published articles reporting anatomical data were selected for this review when they presented cortical map reconstructions or sufficient comprehensive data to reconstruct the rostrocaudal extent of the face/eye or arm representation identified by retrograde tracing or microstimulation mapping. Co-registration There is unfortunately no accepted standard method to report the location of data in monkeys, although an effort is made to provide an MNI standard monkey stereotaxic space ().

The investigators report either the extent of recordings relative to morphological landmarks (genu of the arcuate sulcus, genu of the corpus callosum, anterior commissure), relative to stereotaxic binaural zero, or both, or none of the above. The most comprehensive approach is to report all that information on a reconstructed cortical surface map. In order to co-register the rostrocaudal coordinates reported in all articles considered, we have taken the level of the genu of the arcuate sulcus (ArcGen) as a reference. This landmark is indeed the most reported landmark. When the position of recordings relative to ArcGen was available, we aligned data to the ArcGen position. When stereotaxic coordinates were provided but the location of ArcGen was absent we realigned data on the average ArcGen location obtained from a database of 11 monkey MRIs. This average was AP + 24 (SD 2.6).

The average location for the genu of corpus callosum (32.69 mm) was also used in some cases (on average 8.67 mm between ArcGen and Ccgen). Results Human fMRI In, a single-subject analysis revealed that the feedback-related activation was systematically (15/15 subjects) located in the paracingulate sulcus when present, or in the cingulate sulcus in the absence of the paracingulate sulcus. The activation was also always observed at the junction with a specific short perpendicular sulcus, the vertical paracingulate sulcus.

A less consistent (6 of 15 subjects) posterior peak was systematically located at the intersection between the cingulate sulcus (if there was no paracingulate sulcus) or the paracingulate sulcus (if present) and the preparacentral sulcus. It important to note here that we observed 2 distinct peaks and not a single peak that spread out. Based on the description of the cingulate motor zones described above, such properties suggest that the juice feedback-related activation in the aMCC overlaps with an orofacial representation of RCZa. To evaluate this overlap, we compared the activation coordinates obtained for tongue movements in and for juice feedback () provided in Figure B. We chose to represent only the anterior activation peak because of its consistency in 100% of subjects bilaterally. In the explore/exploit task, activation of RCZp was obtained only in 50% of subjects and is not considered further.

The single-subject data reported on individual morphology for hemispheres with and without a paracingulate sulcus, and in relation to the extent of the 3 cingulate motor zones as described by reveal that both activations for juice feedback in exploration and for tongue movements are located in RCZa and are associated with the paracingulate sulcus when this sulcus is present. Experiments are currently being performed to further test this overlap.

Monkey Meta-analysis If the orofacial representation in human aMCC processes feedback provided by juice, then can we find the same correspondence in monkeys? If so this would converge towards a clear anatomical and functional homology between human and monkey performance monitoring systems, in particular regarding the aMCC/RCZa subregion.

Most unit recording experiments in monkeys reported data acquired close to or just anterior to CMAr in the dorsal bank and fundus of the cingulate sulcus, a region often referred to as the dACC. Because an eye/face representation exists anterior to the hand representation of CMAr, we re-evaluated from the literature the location of outcome or feedback-related activity relative to CMAr representations. We performed a meta-analysis of published data acquired in macaques (see Materials and Methods).

This approach is quite rare in the monkey literature, and is in fact quite difficult, mostly because of a lack of a convention in the reporting of the location of recordings or of anatomical data. Nevertheless, this approach allowed us to synthesize and map available functional data in the cingulate sulcus.

Our aim was to co-register, using the same anatomical reference framework, data from unit recordings, microstimulation mappings, and neuroanatomical tract tracing, and to investigate whether outcome-related activity was likely to come from recordings in the CMAr/face region. As pointed out above, 26 articles formed the basis of this meta-analysis (see regarding selection criteria and methods). Figures and present the major findings. The rostrocaudal extent of regions of interest collected from the 26 articles are grouped according to whether they reported data on outcome-/feedback-related unit activity, data on the location of a face or eye-related area (Face: tracing studies or microstimulations) and, data on the hand region of CMAr (Forelimb) (Fig. ).

Note that the figure reports several specific points regarding each study, including the effectors used to respond in single-unit recording studies (see also ). This information is provided because the effector might be a key factor in determining the functional organization of CMAr.

The raw data show that the eye/face representation clearly overlaps with the recordings reporting outcome-related activity. These 2 regions are somewhat anterior to the forelimb representation in CMAr. Most recordings were performed in the dorsal bank of the cingulate sulcus, and most neuroanatomical data regarding CMAr were in the dorsal bank with some extensions in the ventral bank (see ). Database for meta-analysis in monkeys. Rostrocaudal extent of (top) recording sites in studies reporting feedback/outcome-related activity, (middle) regions with face-related effects of microstimulations and regions with anatomical connections with face-related areas and nuclei, and (bottom) regions with arm-related effects of microstimulations and regions with connections with arm-related areas and spinal levels.

On the left of recording sites extent, symbols of an eye and of a hand indicate the effector used by animals to respond. On the left of Eye/Face studies, “e” and “f” relate to studies focusing on eye-related data (e.g., connections to FEE) or to face-related data (e.g., connection to M1 face), respectively. The specificity of anatomical studies is indicated in brackets (FEF, SEF, M1, C4-T2, C2-C4, C7-T1: injections of tracer in the respective cortical or spinal regions; mstim: microstimulation study; 2DG: study using 2-deoxyglucose). All data are aligned to the level of the genu of the arcuate sulcus (anterior 0, ArcGen).

See for details. Database for meta-analysis in monkeys. Rostrocaudal extent of (top) recording sites in studies reporting feedback/outcome-related activity, (middle) regions with face-related effects of microstimulations and regions with anatomical connections with face-related areas and nuclei, and (bottom) regions with arm-related effects of microstimulations and regions with connections with arm-related areas and spinal levels. On the left of recording sites extent, symbols of an eye and of a hand indicate the effector used by animals to respond.

On the left of Eye/Face studies, “e” and “f” relate to studies focusing on eye-related data (e.g., connections to FEE) or to face-related data (e.g., connection to M1 face), respectively. The specificity of anatomical studies is indicated in brackets (FEF, SEF, M1, C4-T2, C2-C4, C7-T1: injections of tracer in the respective cortical or spinal regions; mstim: microstimulation study; 2DG: study using 2-deoxyglucose). All data are aligned to the level of the genu of the arcuate sulcus (anterior 0, ArcGen). See for details. Meta-analysis of functional and anatomical data in monkeys. ( A) Number of studies covering the rostrocaudal regions of the dorsal bank of the cingulate sulcus (data from Fig. ).

Single-unit recording studies are represented in the opened sulcus. Eye/face data and forelimb-related data are shown just below. Red in the color scale indicates a greater number of studies. AP coordinates for genu of the arcuate (genArc), caudal end of principalis (endSP), and genu of the Corpus Callosum (genCC) are averages taken from a population of 11 rhesus monkeys (from MRI images). ( B) Histogram of data reported along the cingulate sulcus for recordings related to outcome/feedback (yellow), and for anatomical maps for Eye/Face representation (orange) and Forelimb (purple). Comparing distributions reveals that data for Eye/Face and outcome/feedback are different in terms of antero-posterior coverage at P. Meta-analysis of functional and anatomical data in monkeys.

( A) Number of studies covering the rostrocaudal regions of the dorsal bank of the cingulate sulcus (data from Fig. ). Single-unit recording studies are represented in the opened sulcus.

Eye/face data and forelimb-related data are shown just below. Red in the color scale indicates a greater number of studies. AP coordinates for genu of the arcuate (genArc), caudal end of principalis (endSP), and genu of the Corpus Callosum (genCC) are averages taken from a population of 11 rhesus monkeys (from MRI images). ( B) Histogram of data reported along the cingulate sulcus for recordings related to outcome/feedback (yellow), and for anatomical maps for Eye/Face representation (orange) and Forelimb (purple). Comparing distributions reveals that data for Eye/Face and outcome/feedback are different in terms of antero-posterior coverage at P.