{ "dataset": { "archive": "dandi", "id": "001754", "label": "DANDI:001754" }, "page": "datasets/dandi/001754/", "generated": "2026-10-22T21:38:18+00:00", "caution": "A failure to reproduce is not a finding that the paper is wrong. It may be a failure of the attempt.", "outcome_counts": { "reproduced": 1, "partially_reproduced": 2, "not_reproduced": 2, "blocked": 5 }, "outcome_counts_with_outside_data": { "reproduced": 0, "partially_reproduced": 0, "not_reproduced": 0, "blocked": 0 }, "outcome_counts_elsewhere": { "reproduced": 0, "partially_reproduced": 0, "not_reproduced": 0, "blocked": 0 }, "outcome_counts_links": { "reproduced": 0, "partially_reproduced": 0, "not_reproduced": 0, "blocked": 0 }, "attempts": [ { "id": "001754-knierim-2000-03", "dataset": { "archive": "dandi", "id": "001754", "version": "0.260728.1352", "doi": "10.48324/dandi.001754/0.260728.1352" }, "key": "dandi:001754", "label": "DANDI:001754", "dataset_version": "0.260728.1352", "paper": "10.1038/72910", "paper_title": "Three-dimensional spatial selectivity of hippocampal neurons during space flight", "date": "2026-10-20", "kind": "agent", "accountable": "CatalystNeuro", "agent": { "harness": "Claude Code (GitHub Actions)", "model": "claude-opus-5-5", "protocol": "pilot-10" }, "runner": null, "tier": "agent_verified", "deprecated": "", "deprecated_on": null, "entry": "001754-knierim-2000", "entry_title": "Place cells during space flight on the Neurolab mission (Knierim et al. 2000)", "description": "Tests the findings of Knierim, McNaughton and Poe (2000) on dandiset 001754, version 0.260728.1352, which holds sorted units, task epochs, the original rate and occupancy maps, and spike-time positions of three rats recorded before and during the Neurolab shuttle mission. It compares spatial information in flight with preflight for each rat, tests abnormal selectivity on flight day 4 and the stability of fields across two sessions, and records why the direction, EEG and three-surface claims could not be tested. The claims come from the paper's full text.", "notebooks": [ { "path": "reproduce_knierim_2000.ipynb", "title": "Reproducing Knierim et al. (2000) from dandiset 001754", "executed": "notebooks/001754-knierim-2000/reproduce_knierim_2000.html" } ], "outcomes": [ { "claim": "flight-spatial-code", "statement": "In flight, after an initial period, hippocampal place cells on the Escher staircase showed normal, spatially specific firing, with spatial information per spike not different from the same rats' preflight cells.", "source": "Main text, paragraph beginning \"During the Neurolab Space Shuttle mission\", last sentence; supported by the paragraphs beginning \"Spatial firing patterns of 16 active place cells\" and \"The mean spatial-information content for all 7\" and Figures 2a, 2c and 3a; also the standfirst", "quote": "Nonetheless, place cells eventually demonstrated normal, spatially specific firing properties.", "statistics": [], "kind": "finding", "inferred": "", "outcome": "blocked", "blocked_by": "methods_underspecified", "notebook": "reproduce_knierim_2000.ipynb", "notes": "The criterion judges this claim from its three dependencies. si-comparable-to-preflight is partially reproduced, si-rat3-fd4-vs-preflight reproduced and si-rat1-fd9-vs-preflight blocked as methods_underspecified. The others do not decide it, as the rule gives partially reproduced if the rat 1 comparison is reproduced or partially reproduced and not reproduced if it is not reproduced; the rat 1 preflight ES reading (p = 0.50) would give the first and the preflight MC reading (p = 0.0055, flight higher) the second. The outcome differs from 001754-knierim-2000-02 (not reproduced) because the claim is now judged as the paper judges it, by spatial information against preflight, and not by a shuffle test the paper does not use; that test is not run. The answers of 2026-10-20 leave the rat 1 comparison blocked, as its criterion now says when the two preflight epochs disagree, so this claim is blocked before and after.", "deviations": [ "Inherits the deviations of its three dependencies." ], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "si-comparable-to-preflight", "statement": "For rat 2, the spatial information per spike of the 16 active cells recorded on the Escher staircase on flight day 9 (1.13 +/- 0.09 bits) did not differ significantly from that of its 19 active preflight cells (1.12 +/- 0.08 bits), by Mann-Whitney test.", "source": "Main text, paragraph beginning \"Spatial firing patterns of 16 active place cells\", sentences 1 and 3; Figure 2a,b", "quote": "An index of spatial tuning specificity ... did not significantly differ between cells recorded preflight and those recorded on FD9 (for active cells, defined as having a mean firing rate > 0.05 Hz on the track; mean information per spike \u00b1 s.e. preflight, 1.12 \u00b1 0.08 bits, n = 19; FD9, 1.13 \u00b1 0.09 bits, n = 16; not significant by Mann-Whitney)", "statistics": [], "kind": "finding", "inferred": "", "outcome": "partially_reproduced", "blocked_by": null, "notebook": "reproduce_knierim_2000.ipynb", "notes": "Under both readings with preflight values the Mann-Whitney test finds no difference. Rat 2's 17 active FD9 ES maps have 1.377 +/- 0.120 bits per spike, against 1.320 +/- 0.112 for its 21 preflight ES maps (p = 0.88, difference 0.057) and 1.284 +/- 0.116 for its 25 preflight MC maps (p = 0.66, difference 0.092). No reading puts both means within tolerance (1.377 above 1.22; 1.320 and 1.284 above 1.20), so the rule gives partially reproduced. The FD9 count (17) is within 16 +/- 1.6 and the preflight counts (21, 25) are not within 19 +/- 1.9. Reading M-b gives 2.965 +/- 0.224 over 25 active FD9 units but cannot be computed preflight; tested against the M-a preflight values it differs (p 6.2e-07 and 2.5e-07), a variant, not judged. Leaving out the maps with cell_number -1 (a variant) the test finds no difference either (p 0.87 and 0.56). The FD9 ES window is one in which the trace behaves as Rat 2's position (data check). In 001754-knierim-2000-02 this claim, then from the dandiset's description and judged on Rats 1 and 2 pooled by medians, was reproduced (later removed from that record); the outcome differs because the claim is now rat 2's, with the paper's means as expected values, which the deposited maps exceed. What the answers of 2026-10-20 changed. The criterion now has both sides of a comparison use one map reading and judges on M-a where M-b cannot be computed preflight, which is what this attempt had done; and under S-b each epoch of the preflight day is run on its own, so S-b gives the same two readings (ES and MC) as S-a, where the attempt had read S-b as MC alone. Neither changes a number or the outcome (partially reproduced before and after).", "deviations": [ "Reading M-a uses the deposited maps, each identical copy once, and counts a map as active by its own occupancy-weighted mean rate, as the pinned version cannot link maps to units.", "Which preflight epoch was the rectangular track of Fig. 2b is not stated in the files." ], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "si-rat1-fd9-vs-preflight", "statement": "For rat 1, the mean spatial information of its 21 active cells on flight day 9 (1.19 +/- 0.09 bits) did not differ significantly from its preflight cells (1.37 +/- 0.10 bits, n = 28).", "source": "Main text, paragraph beginning \"Spatial firing patterns of 16 active place cells\", sentences 4 and 5; Figure 2c", "quote": "We also determined the spatial tuning of 21 active cells from rat 1 on FD9 (Fig. 2c). ... did not significantly differ from that rat's preflight data (1.37 \u00b1 0.10; n = 28).", "statistics": [], "kind": "finding", "inferred": "", "outcome": "blocked", "blocked_by": "methods_underspecified", "notebook": "reproduce_knierim_2000.ipynb", "notes": "The readings disagree on the test. Rat 1's 24 active FD9 ES maps (1.588 +/- 0.143 bits per spike) do not differ from its 25 preflight ES maps (1.804 +/- 0.149, p = 0.50, difference -0.216) and are higher than its 24 preflight MC maps (1.127 +/- 0.114, p = 0.0055, difference 0.461); the paper does not say on which track or in which epoch rat 1's preflight cells were recorded. No mean is within tolerance (1.19 +/- 0.09, 1.37 +/- 0.10) and no count within 10% (24 against 21; 25 and 24 against 28). Reading M-b gives 3.331 +/- 0.268 over 24 units, flight only, and is not judged. Leaving out the maps with cell_number -1 (a variant) the readings disagree in the same way (p 0.40 against ES, 0.020 against MC), with 21 FD9 maps, the paper's count. What the answers of 2026-10-20 changed. The criterion now runs each preflight epoch on its own under S-a and S-b, prefers neither, and keeps the claim blocked when they disagree, so the block that the attempt had applied pending the answer is now the criterion's own; the outcome is blocked before and after. New claim; 001754-knierim-2000-02 had none like it.", "deviations": [ "As for si-comparable-to-preflight (M-a activity by map rate)." ], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "si-rat3-fd4-vs-preflight", "statement": "For rat 3, the mean spatial information of all 7 active place cells on flight day 4 (1.12 +/- 0.27 bits, session 2) was not different from its preflight cells (1.48 +/- 0.11 bits, n = 24).", "source": "Main text, paragraph beginning \"The mean spatial-information content for all 7\", sentence 1; Figure 3a", "quote": "The mean spatial-information content for all 7 active place cells from rat 3 on the fourth day of flight (FD4) was 1.12 \u00b1 0.27 bits (Fig. 3a), which was not different from the information content measured for this rat's place cells before the flight (1.48 \u00b1 0.11 bits; n = 24).", "statistics": [], "kind": "finding", "inferred": "", "outcome": "reproduced", "blocked_by": null, "notebook": "reproduce_knierim_2000.ipynb", "notes": "Under both readings the test finds no difference. Rat 3's 11 active session 2 (ES1) maps have 1.231 +/- 0.206 bits per spike, against 1.518 +/- 0.125 for its 38 preflight ES maps (p = 0.28, difference -0.287) and 1.337 +/- 0.121 for its 33 preflight MC maps (p = 0.77, difference -0.106). Under the ES reading both means are within tolerance (1.12 +/- 0.27 and 1.48 +/- 0.11), which the rule requires of one reading. The counts are not (11 against 7; 38 and 33 against 24), so the cells are not the paper's set; the criterion's rule does not use them. Session 3 (ES2, 19 maps, 1.384 +/- 0.177) does not differ from either preflight epoch (p = 0.28 and 0.86). Reading M-b gives 3.038 +/- 0.334 over 16 units, flight only, and is not judged. The answers of 2026-10-20 (one map reading on both sides; each preflight epoch a candidate under S-a and S-b) confirm the readings the attempt judged on and change no number; reproduced before and after. New claim.", "deviations": [ "As for si-comparable-to-preflight. Session 2 is read as the file's first ES epoch (ES1), as the paper says the first session was lost." ], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "fd4-abnormal-selectivity", "statement": "On the first experience of the Escher staircase on flight day 4, place cells of rats 1 and 2 showed abnormal patterns of spatial selectivity, which differed between the two rats.", "source": "Main text, paragraph beginning \"It is interesting to note\", sentence 1 (given as unpublished observations)", "quote": "on the first experience on the Escher staircase on FD4, firing of place cells showed abnormal patterns of spatial selectivity that differed between rats 1 and 2", "statistics": [], "kind": "finding", "inferred": "", "outcome": "partially_reproduced", "blocked_by": null, "notebook": "reproduce_knierim_2000.ipynb", "notes": "Lower spatial information than preflight holds for rat 2 under both readings and for rat 1 under neither. Rat 2's 14 active FD4 ES maps (0.708 +/- 0.112 bits per spike) are lower than its preflight ES (1.320, p = 0.00063) and MC maps (1.284, p = 0.0015). Rat 1's 20 FD4 ES maps (1.409 +/- 0.192) are lower than its preflight ES maps without significance (1.804, p = 0.077) and higher than its MC maps (1.127, p = 0.36). Rat 2's FD4 maps are also lower than its FD9 maps (1.377, p = 0.00033); Rat 1's are not (1.588, p = 0.38). In Rat 2's FD4 ES window the trace could not be shown to be Rat 2's position (data check). The Rat1 and Rat2 files hold one trace there (4 of 707 shared valid positions more than 2 px apart), and Rat 2's FD4 units carry more information than every time shift on neither file's copy (0 of 17 and 1 of 16, against 12 of 28 and 16 of 28 on FD9), so whether the low FD4 information comes from firing or from tracking is not known; the criterion sets no condition on this. That file holds five identical copies of maps, counted once. Leaving out the maps with cell_number -1 (a variant) gives the same pattern (Rat 2 p 0.0002 and 0.0017; Rat 1 p 0.24 and 0.42). That the patterns differed between the rats is not judged. In 001754-knierim-2000-02 this claim, then from the dandiset's description and judged on Rats 1 to 3 pooled by a one-sided test, was reproduced (later removed from that record); it now requires each of rats 1 and 2 with a two-sided test, and holds for one. The answers of 2026-10-20 (one map reading on both sides, so M-b is not run as it has no preflight values; each preflight epoch a candidate) are what the attempt had done and change no number; partially reproduced before and after.", "deviations": [ "As for si-comparable-to-preflight." ], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "fig3-stability-across-sessions", "statement": "For rat 3 on flight day 4, most of the 7 cells kept the same firing fields in a third session that followed the second immediately; the fourth cell lost its field, and a few other cells gained a field in session 3.", "source": "Main text, paragraph beginning \"The mean spatial-information content for all 7\", sentence 2; Figure 3a,b and legend", "quote": "Another recording session followed immediately, and most cells maintained the same firing fields in both sessions (Fig. 3b), demonstrating that the spatial tuning was stable across different exposures to the track.", "statistics": [], "kind": "finding", "inferred": "", "outcome": "not_reproduced", "blocked_by": null, "notebook": "reproduce_knierim_2000.ipynb", "notes": "Under M-b, the one reading that can be run, 6 of 16 active session 2 units keep their field by reading (a) (same-cell correlations -0.024 to 0.366, 95th percentile of 240 different-cell pairs 0.094) and 1 of 16 by reading (b), neither more than half (8), so the rule gives not reproduced. M-a is not run, as the criterion says when its pairing condition fails. Each distinct deposited map with a unit on its tetrode, 17 of 19 in session 2 (all 11 active maps among them) and 23 of 23 in session 3, was tied to the unit of its tetrode whose spike-count map it best matches. In session 2 no unit is tied to two maps (two maps are each the best map of two units, the second unit matching at r 0.009 and 0.059); in session 3 four are (TT10 cluster 6, TT4 cluster 3, TT5 cluster 2, TT8 cluster 5), three of them units of active session 2 maps. Session 2 has 16 active units and 11 active deposited maps (mean rates 0.061 to 2.500 Hz), not 7, and nothing in the files marks which 7 the paper showed. Reading (b) under M-b gives 2, 1, 0 and 0 cells at field thresholds of 0.1, 0.2, 0.3 and 0.5. Four units below 0.05 Hz in session 2 are active in session 3, which fits the legend's cells that gained a field; which cell lost its field is not judged. What changed. Before round 1 of verification the check tied each unit to its best map and silently kept the better match when two units chose one map, so it did not test the criterion's condition; it passed, M-a was judged, and its reading (a) kept the claim blocked. The answers of 2026-10-20 had made \"most\" more than half of the active cells, not a count of 4. The outcome differs from 001754-knierim-2000-02 (reproduced), which used a median correlation of smoothed maps that the paper does not give; the claims file now gives a per-cell rule for 7 cells.", "deviations": [ "Session 2 and session 3 are read as the file's ES1 and ES2.", "Reading M-a is not run, as the pairing of deposited maps to units by best match, which the criterion allows only when one to one, is not one to one; the dandiset gives no link. The claim rests on unsmoothed recomputed maps with few spikes per 4-pixel bin.", "Takes the same tetrode and cluster id in both epochs to be the same cell." ], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "direction-selectivity", "statement": "Some cells had place fields only when the rat moved counterclockwise through a location, showing the direction selectivity seen on such tracks on Earth.", "source": "Main text, paragraph beginning \"The rats occasionally turned around on the track\", sentences 1 and 2", "quote": "Some cells demonstrated place fields when the rat was moving only counterclockwise through a single location, thus demonstrating the direction selectivity that is seen on such tracks under normal terrestrial conditions", "statistics": [], "kind": "finding", "inferred": "", "outcome": "blocked", "blocked_by": "methods_underspecified", "notebook": "reproduce_knierim_2000.ipynb", "notes": "The criterion needs, per bin, the time spent moving counterclockwise and clockwise. The dandiset gives position only at spike times (7.6 to 35.7 samples per second in the ES epochs, gaps up to 12.7 s) and one occupancy map per epoch with no direction, and nothing gives the track's layout in the image from which the direction along the circuit could be read. The claims file names no outside data. No entry of the zip files of the NASA record (OSD-968) has a position-like name, but its spike files (.cel) and the archives nested in its processed files were not opened, so whether it holds continuous position is not known. The answer of 2026-10-20 says the paper gives no method, no time base by direction and no track layout and allows no reading without them, and the criterion now blocks the claim as methods_underspecified in that case; before the answer the attempt blocked it as data_missing. Untested before and after. New claim.", "deviations": [], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "theta-normal", "statement": "Hippocampal EEG showed normal theta rhythm during active locomotion, in all rats on flight days 4 and 9.", "source": "Main text, paragraph beginning \"The rats occasionally turned around on the track\", sentences 3 and 4", "quote": "Hippocampal EEG activity was also ... recorded during baseline and behavioral sessions in all rats on FD4 and FD9. Although the small number of subjects precluded a statistical analysis, they showed normal theta rhythm during active locomotion", "statistics": [], "kind": "finding", "inferred": "", "outcome": "blocked", "blocked_by": "data_missing", "notebook": "reproduce_knierim_2000.ipynb", "notes": "No file holds EEG or any continuous voltage (no ElectricalSeries or LFP in the listing of every file). The NASA record OSD-968 has no passage on EEG, theta, ripples or LFP, and no name inside its 26 zip files suggests EEG. Same outcome as in 001754-knierim-2000-02 (later removed from that record).", "deviations": [], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "ripples-normal", "statement": "Hippocampal EEG showed normal sharp waves and ripples during quiet inactivity in the sleeping pouch, on both flight days.", "source": "Main text, paragraph beginning \"The rats occasionally turned around on the track\", sentence 4", "quote": "they showed normal theta rhythm during active locomotion and normal sharp waves and ripples15 during quiet inactivity in the sleeping pouch on both flight days.", "statistics": [], "kind": "finding", "inferred": "", "outcome": "blocked", "blocked_by": "data_missing", "notebook": "reproduce_knierim_2000.ipynb", "notes": "No EEG in the dandiset, nor among the names of the OSD-968 files (see theta-normal). Same outcome as in 001754-knierim-2000-02 (later removed from that record).", "deviations": [], "disagreed": false, "data": "dataset", "where": null, "proposed": null }, { "claim": "three-orthogonal-surfaces", "statement": "Hippocampal cells formed distinct, reliable representations of position on the three orthogonal surfaces of the Escher staircase in microgravity.", "source": "Main text, paragraph beginning \"It is interesting to note\", sentence 2; also the standfirst", "quote": "Thus hippocampal cells can form unique, reliable representations of position on three orthogonal surfaces in microgravity", "statistics": [], "kind": "finding", "inferred": "", "outcome": "not_reproduced", "blocked_by": null, "notebook": "reproduce_knierim_2000.ipynb", "notes": "Part (i) fails, as fig3-stability-across-sessions is not reproduced, and the criterion gives not reproduced when either dependency is not reproduced, whatever part (ii) gives. flight-spatial-code is blocked as methods_underspecified, which does not change this. Part (ii) could not be tested in any case, as it needs the three surfaces drawn in the position frame and the dandiset holds one two-dimensional pixel position with no camera view, track layout or pixel scale; the NASA record says two synchronised cameras recorded position, and the conversion code at b538d9e describes the track only as three-dimensional with 90 degree turns. Before round 1 of verification both dependencies were blocked, and so was this claim; it moved with fig3-stability-across-sessions. In 001754-knierim-2000-02 it was blocked as metadata_insufficient.", "deviations": [ "Inherits the deviations of fig3-stability-across-sessions (judged on M-b alone)." ], "disagreed": false, "data": "dataset", "where": null, "proposed": null } ], "findings": [ { "kind": "metadata_error", "statement": "Still present (partly fixed in the unpublished draft). The Rat1 and Rat2 files of each flight day hold one tracker's trace over the whole session (98.6 to 98.8% of positions at shared timestamps within 2 pixels), each presented as that rat's position, and nothing names the animal tracked. With real against time-shifted spikes, the trace behaves as Rat2's position in Rat2's flight day 9 ES window (12 of 28 Rat2 units, 0 of 36 Rat1 units), and in Rat2's flight day 4 ES window neither rat's units are selective (0 of 17 and 1 of 17), so whose position it is there is not established; there the two files hold the same trace (4 of 707 shared valid positions more than 2 pixels apart), so neither file's copy settles it." }, { "kind": "data_missing", "statement": "Still present. Position is given only at spike times, so occupancy time cannot be computed from it, and the preflight files have no position at all." }, { "kind": "metadata_error", "statement": "Still present in this version (the draft's description drops it). The dandiset description says the preflight recordings were made on a flat rectangular track, but the preflight files label their epochs ES (Escher staircase) and MC (Magic Carpet) and hold ES and MC rate maps. The paper states the rectangular track for rat 2 only." }, { "kind": "metadata_error", "statement": "New. The files' experiment description says baseline sessions were on a rectangular track, interleaved with task sessions; the paper says the baseline sessions were in the sleeping pouch, and the rectangular track was rat 2's preflight task. The preflight files have no baseline epoch." }, { "kind": "identifier_missing", "statement": "Still present (fixed in the draft). The rate-map table says cell_number matches the cluster id on the same tetrode, but the stated link exists for 98 of 211 flight unit-epochs and names the best-matching map for 84. Every one of Rat3's 42 flight day 4 ES maps has cell_number -1 (\"not a per-cell map\") though their names are per-cell short names, so Rat3's session 2 and session 3 maps cannot be paired by cell; tying each to the unit it best matches is not one to one in session 3. Elsewhere 2 to 10 active maps per file and epoch have cell_number -1, and in flight these match one unit about as well as the numbered maps (median correlation 0.555 against 0.595), so they appear to be per-cell maps without their cell number." }, { "kind": "metadata_insufficient", "statement": "Still present (partly fixed in the draft). The rate maps are smoothed (91% of the positive-rate bins of a well-matched map hold no spike of the unit), and neither that nor the kernel is stated." }, { "kind": "metadata_insufficient", "statement": "Still present (fixed in the draft). Rate maps use -999 for unvisited bins, which the column description (rate in Hz) does not state, and the occupancy counts the lost position (0, 255) in bin [63, 0], up to 19% of a flight occupancy map." }, { "kind": "other", "statement": "Still present (fixed in the draft). Six groups of identical rate maps are stored in three files, some under different tetrodes (Rat1 FD4 TT1 and TT11; Rat2 FD4 TT13, TT19 and TT22; Rat2 FD9 TT13 and TT14)." }, { "kind": "data_missing", "statement": "Still present (partly fixed in the draft's description). The dandiset description reports normal theta and sharp waves and ripples in the hippocampal EEG, but no file holds EEG, and no file name in the NASA record OSD-968 suggests it." }, { "kind": "metadata_insufficient", "statement": "Still present (fixed in the draft). Spike times are resolved to 1 ms or finer below 1000 s, 10 ms to 10000 s and 0.1 s beyond, with zero intervals that follow, and this is not stated; Rat1's flight day 4 file has two overlapping baseline epochs (2525 to 3390 s and 2720 to 3390 s), and 1 to 14 spikes per file lie outside every epoch." }, { "kind": "metadata_insufficient", "statement": "Still present (partly fixed in the draft). The age is \"/\" for every subject, and the position's pixel scale and camera view are not described." }, { "kind": "metadata_insufficient", "statement": "Still present. Rat2's preflight units are on tetrodes TT0 to TT10 and its flight units on TT12 to TT22, with no tetrode in common, while Rat1 and Rat3 share 4 to 6 tetrodes between preflight and flight; nothing in the files confirms the preflight files are assigned to the right rats." }, { "kind": "data_missing", "statement": "New. The position ends before the end of two MC epochs, at 6308 s in Rat3's flight day 4 file (41 s before the epoch ends, 5.3% of its MC spikes without a position) and at 10144 s in Rat2's flight day 9 file (7 s before)." }, { "kind": "selection_undocumented", "statement": "New. The dandiset holds more active cells than the paper counts in most comparisons (Rat3 preflight 38 active ES maps against the paper's 24; Rat3 flight day 4 session 2, 11 maps and 16 units against 7; Rat1 flight day 9, 24 against 21), and the selection behind the paper's counts is not recorded." } ], "verifications": [ { "date": "2026-10-20", "kind": "agent", "by": "Independent agent run by CatalystNeuro (same harness, separate context, did not write the notebook)", "reviewed": "Round 1. The executed notebook with the conclusion cells and the summary removed, the helper module and the claims file, with the paper. The verifier checked the archive's asset metadata for the blocked claims and tested the pairing logic on a synthetic case. Its report had no attempt record and gave its own outcome for each claim; all 10 agree with the record as it then stood, and for fig3-stability-across-sessions it added that the outcome may be not_reproduced.", "agreed": 10, "of": 10, "disagreements": [] }, { "date": "2026-10-20", "kind": "agent", "by": "Independent agent run by CatalystNeuro (same harness, separate context, did not write the notebook)", "reviewed": "Round 2. The full executed notebook after the round 1 revision, with its conclusion cells and summary, the attempt record, the README, the helper module and the claims file, with the paper. The verifier agreed with all 10 outcomes, found no misreading of the paper in the claims file, and listed four sentences the printed numbers did not support.", "agreed": 10, "of": 10, "disagreements": [] } ] } ], "entries": [ { "name": "001754-knierim-2000", "type": "reproduction", "title": "Place cells during space flight on the Neurolab mission (Knierim et al. 2000)", "description": "Tests the findings of Knierim, McNaughton and Poe (2000) on dandiset 001754, version 0.260728.1352, which holds sorted units, task epochs, the original rate and occupancy maps, and spike-time positions of three rats recorded before and during the Neurolab shuttle mission. It compares spatial information in flight with preflight for each rat, tests abnormal selectivity on flight day 4 and the stability of fields across two sessions, and records why the direction, EEG and three-surface claims could not be tested. The claims come from the paper's full text.", "datasets": [ "dandi:001754" ], "papers": [ "10.1038/72910" ], "derived_from": [], "notebooks": [ { "path": "reproduce_knierim_2000.ipynb", "title": "Reproducing Knierim et al. (2000) from dandiset 001754", "executed": "notebooks/001754-knierim-2000/reproduce_knierim_2000.html" } ] } ] }