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The School of Psychology

Dr Ramakrishna Chakravarthi

In this section
Dr Ramakrishna Chakravarthi
Dr Ramakrishna Chakravarthi
Dr Ramakrishna Chakravarthi

Senior Lecturer

51cg
Email Address
rama@abdn.ac.uk
Telephone Number
+44 (0)1224 272243
Office Address

School of Psychology

William Guild Building Room S7

Kings College

Old Aberdeen AB24 3FX

School/Department
School of Psychology


Memberships and Affiliations

Internal Memberships
  • Chair of EDI Committee
  • PS3524 (Cognitive Neuroscience) course coordinator
External Memberships
  • Editorial Board Member: Journal of Vision, Cortex
  • External examiner: MSc Cognitive Neuroscience, Durham University
Research

Research Overview

  • Neural mechanisms (EEG) in visual perception and attention
  • Numerical cognition: estimation and subitizing
  • Object recognition: crowding and categorisation
  • Time perception
  • Intentionality, sense of agency, and visual awareness
  • Aesthetics: symmetry and beauty

Funding and Grants

2026-30

Does selective visual attention sample rhythmically? Lundbeck Foundation (Denmark) grant awarded to Soren Andersen (PI), Marco Steinhauser (Co-I) and me (Co-I), DKK 6,259,925, equivalent to ~£735,000

2025-26

Sense of Agency in social interaction through reciprocal action timing, EPS Small Grant awarded to Bert Timmermans (PI) and me (Co-I), £9,985

2021-22

Visual processing in humans and machines, Internal Funding to Pump-Prime Interdisciplinary Research and Impact Activities awarded to me (PI), Murilo Batista and Alasdair Clarke, £6,040

2019-20

Experiencing myself through you: Self-agency in social interactions, Carnegie Research Incentive Grant awarded to Bert Timmermans (PI) and me (Co-I), £9,914

2019-21

Investigating the microstructure of human visual fields and generating low-vision applications, BBSRC International Partnering award granted to Dr Jasna Martinovic (PI), Dr Daniel Coates (Houston, external partner), Dr Josephine Reuther (post-doc) and me (Co-I), £10,000

2018-21

Neural mechanisms of long-range spatial vision: an investigation of perceptive, integrative and association fields across the lifespan, BBSRC grant awarded to Dr Jasna Martinovic (PI) and me (Co-I), £344,000
Teaching

Teaching Responsibilities

Level 2:   Perception
Level 3:
  1. Methodology: Semester long research project (5-6 students each semester)
  2. Cognitive Neuroscience (Levels 3 and 4)
  3. Level 3 Biological Psychology tutorials
Level 4:
  1. Senior honours (research-based) thesis (6-7 students each year)
  2. Sixth Century Course on Consciousness (Levels 3 and 4)
Masters:
  1. MRes Bayesian Statistics
  2. MSc Bayesian Statistics
  3. MRes thesis supervision
Others:
   PhD Supervision
Publications

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  • Distinct spatial patterns of flanker interference differentiate visual crowding from flanker compatibility effects in the Eriksen task

    Papadaki, D., Chakravarthi, R., Andersen, S.
    Journal of Experimental Psychology: Human Perception and Performance, vol. 52, no. 4, pp. 424-439
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • The effect of target-flanker similarity in dense crowding

    Chakravarthi, R.
    Quarterly Journal of Experimental Psychology
    Contributions to Journals: Articles

  • Method matters: Diverging patterns in online measures of temporal binding

    Silver, C. A., Tatler, B., Chakravarthi, R., Timmermans, B.
    Consciousness and Cognition, vol. 140, 104022
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Suppressive interactions between nearby stimuli in visual cortex reflect crowding

    Soo, L., Antonov, P. A., Chakravarthi, R., Andersen, S.
    Journal of Cognitive Neuroscience, vol. 38, no. 1, pp. 1-14
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Contour integration in the parafovea and the near periphery: Testing the association field account

    Reuther, J., Chakravarthi, R., Martinovic, J.
    Proceedings of the Royal Society of London. B, Biological Sciences, vol. 292, no. 2055, 20251107
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Neural representations of visual categories are dynamically tailored to the discrimination required by the task

    Poncet, M., Batziou, P., Chakravarthi, R.
    Cerebral Cortex, vol. 35, no. 8, bhaf212
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • The time course of Temporal Binding in social and nonsocial interactions

    Silver, C. A., Tatler, B., Chakravarthi, R., Timmermans, B.
    Psychonomic Bulletin and Review, vol. 32, no. 1, pp. 326-341
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • Neural and behavioral signatures of the multidimensionality of manipulable object processing

    Almeida, J., Fracasso, A., Valério, D., Chakravarthi, R., Tal, Z., Walbrin, J., Kristensen, S., Bergström, F.
    Communications Biology, vol. 6, no. 1, 940
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • Fundamental units of numerosity estimation

    Chakravarthi, R., Nordqvist, A., Poncet, M., Adamian, N.
    Cognition, vol. 239, 105565
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • The effect of stimulus similarity in the Eriksen Flanker Task

    Papadaki, D., Chakravarthi, R., Andersen, S.
    Vision Sciences Society (VSS)
    Contributions to Conferences: Abstracts
    • [ONLINE] DOI:

  • Inner-outer asymmetry in the Eriksen f lanker task

    Papadaki, D., Chakravarthi, R., Andersen, S.
    European Conference of Visual Perception (2022), pp. 180-181
    Contributions to Conferences: Abstracts
    • [ONLINE] DOI:

  • Visual field asymmetries in numerosity processing

    Chakravarthi, R., Papadaki, D., Krajnik, J.
    Attention, Perception, and Psychophysics, vol. 84, no. 8, pp. 2607-2622
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • The time course of social and non-social implicit Sense of Agency

    Silver, C. A., Tatler, B., Chakravarthi, R., Timmermans, B.
    Working Papers: Preprint Papers
    • [ONLINE] DOI:

  • Effects of Spatial Arrangement of Flankers in the Eriksen Flanker task

    Papadaki, D., Chakravarthi, R., Andersen, S.
    Scottish Vision Group (SVG) 2022
    Contributions to Conferences: Abstracts
    • [ONLINE] DOI:

  • Masking, crowding and grouping: Connecting low and mid-level vision

    Reuther, J., Chakravarthi, R., Martinovic, J.
    Journal of Vision, vol. 22, no. 2, 7
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Characterizing the in-out asymmetry in visual crowding

    Chakravarthi, R., Rubruck, J., Kipling, N., Clarke, A. D. F.
    Journal of Vision, vol. 21, no. 11, 10
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Emergence of crowding: the role of contrast and orientation salience

    Lee, R. J., Reuther, J., Chakravarthi, R., Martinovic, J.
    Journal of Vision, vol. 21, no. 11, pp. 1-21
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Age-related changes in low and midlevel vision: assessing the information degradation and neural inhibition accounts

    Reuther, J., Chakravarthi, R., Martinovic, J.
    AVA 2020 Virtual Christmas Meeting, pp. 591-592
    Contributions to Journals: Abstracts
    • [ONLINE] DOI:

  • Social Agency as a Continuum

    Silver, C., Tatler, B., Chakravarthi, R., Timmermans, B.
    Psychonomic Bulletin and Review, vol. 28, pp. 434-453
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • Subitizing object parts reveals a second stage of individuation

    Poncet, M., Chakravarthi, R.
    Psychonomic Bulletin and Review, vol. 28, pp. 476-486
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • A simple rule to describe interactions between visual categories

    Poncet, M., Fabre-Thorpe, M., Chakravarthi, R.
    European Journal of Neuroscience, vol. 52, no. 12, pp. 4639-4666
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • Too little, too late, and in the wrong place: Alpha band activity does not reflect an active mechanism of selective attention

    Antonov, P. A., Chakravarthi, R., Andersen, S. K.
    Neuroimage, vol. 219, 117006
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • Research Plan - How gaze is deployed in visual target choice and how we identify if like-wise choices are human- or computer-generated when observing and interacting

    Silver, C. A., Tatler, B., Chakravarthi, R., Timmermans, B.
    EPS Online 2020
    Contributions to Conferences: Posters
    • [ONLINE] DOI:

  • Crowding in humans is unlike that in convolutional neural networks

    Lonnqvist, B., Clarke, A. D. F., Chakravarthi, R.
    Neural Networks, vol. 126, pp. 262-274
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • Clustering leads to underestimation of numerosity, but crowding is not the cause

    Chakravarthi, R., Bertamini, M.
    Cognition, vol. 198, 104195
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • Response selection modulates crowding: a cautionary tale for invoking top-down explanations

    Reuther, J., Chakravarthi, R.
    Attention, Perception & Psychophysics, vol. 82, no. 4, pp. 1763-1778
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [ONLINE]

  • The eye that binds: Feature integration is not disrupted by saccadic eye movements

    Reuther, J., Chakravarthi, R., Hunt, A. R.
    Attention, Perception & Psychophysics, vol. 82, pp. 533-549
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Neural Correlates of Motion Perception

    Papadaki, D., Pilz, K. S., Chakravarthi, R.
    i-Perception, vol. 10, no. 14-15
    Contributions to Journals: Abstracts
    • [ONLINE] DOI:

  • Two’s company, three’s a crowd: Individuation is necessary for object recognition

    Chakravarthi, R., Herbert, A.
    Cognition, vol. 184, pp. 69-82
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [OPEN ACCESS]
    • [ONLINE]

  • Critical resolution: A superior measure of crowding

    Soo, L., Chakravarthi, R., Andersen, S. K.
    Vision Research, vol. 153, pp. 13-23
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Does Self-Prioritisation Affect Perceptual Processes?

    Reuther, J., Chakravarthi, R.
    Scottish Vision Group Meeting, 2017, pp. 15-15
    Contributions to Journals: Abstracts
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Does self-prioritization affect perceptual processes?

    Reuther, J., Chakravarthi, R.
    Visual Cognition, vol. 25, no. 1-3, pp. 381-398
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]
    • [OPEN ACCESS]
    • [ONLINE]

  • Target discrimination is not affected by distractor expectation

    Reuther, J., Chakravarthi, R.
    Perception, vol. 45, no. S2, pp. 227
    Contributions to Journals: Abstracts
    • [ONLINE] DOI:

  • Combining S-cone and luminance signals adversely affects discrimination of objects within backgrounds

    Jennings, B. J., Tsattalios, K., Chakravarthi, R., Martinovic, J.
    Scientific Reports, vol. 6, pp. 1-10
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Category effect in visual crowding= feature differences plus overlap differences

    Reuther, J., Chakravarthi, R.
    The Scottish Vision Group (SVG) Meeting 2015
    Contributions to Journals: Abstracts
    • [ONLINE]
    • [ONLINE] DOI:

  • Can anticipating distractors influence visual object recognition accuracy?

    Reuther, J., Chakravarthi, R.
    The Scottish Vision Group (SVG) 2016, pp. 15
    Contributions to Conferences: Abstracts

  • The temporal dynamics of visual processing in multiple sclerosis

    Lopes Costa, S., Gonçalves, O. F., DeLuca, J., Chiaravalloti, N., Chakravarthi, R., Almeida, J.
    Applied Neuropsychology. Adult, vol. 23, no. 2, pp. 133-140
    Contributions to Journals: Articles
    • [ONLINE] DOI:

  • Category effect in visual crowding = feature differences + overlap differences

    Reuther, J., Chakravarthi, R.
    The Scottish Vision Group (SVG) Meeting 2015, pp. 20
    Contributions to Conferences: Abstracts

  • Higher-level effects in crowding falter when low-level attributes are controlled for

    Reuther, J., Chakravarthi, R.
    38th European Conference on Visual Perception (ECVP) 2015 Liverpool, pp. 182-183
    Contributions to Conferences: Abstracts
    • [ONLINE]

  • The Bouma law of crowding, revised: Critical spacing is equal across parts, not objects

    Rosen, S., Chakravarthi, R., Pelli, D. G.
    Journal of Vision, vol. 14, no. 6, 10
    Contributions to Journals: Articles
    • [ONLINE]
    • [ONLINE] DOI:

  • Categorical membership modulates crowding: evidence from characters

    Reuther, J., Chakravarthi, R.
    Journal of Vision, vol. 14, no. 6, pp. 1-13
    Contributions to Journals: Articles
    • [ONLINE]
    • [ONLINE] DOI:

  • The temporal evolution of coarse location coding of objects: evidence for feedback

    Chakravarthi, R., Carlson, T. A., Chaffin, J., Turret, J., VanRullen, R.
    Journal of Cognitive Neuroscience, vol. 26, no. 10, pp. 2370-2384
    Contributions to Journals: Articles
    • [ONLINE] DOI:

  • For whom the bell tolls: periodic reactivation of sensory cortex in the gamma band as a substrate of visual working memory maintenance

    Van Vugt, M. K., Chakravarthi, R., Lachaux, J.
    Frontiers in Human Neuroscience, vol. 8, 696
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [OPEN ACCESS]

  • Evidence for categorical crowding

    Reuther, J., Chakravarthi, R.
    The Scottish Vision Group (SVG) Meeting 2014
    Contributions to Conferences: Abstracts
    • [ONLINE]

  • Conscious updating is a rhythmic process

    Chakravarthi, R., VanRullen, R.
    PNAS, vol. 109, no. 26, pp. 10599-10604
    Contributions to Journals: Articles
    • [ONLINE] DOI:

  • Substitution and pooling in crowding

    Freeman, J., Chakravarthi, R., Pelli, D.
    Attention, Perception & Psychophysics, vol. 74, no. 2, pp. 379-396
    Contributions to Journals: Articles
    • [ONLINE] DOI:

  • Bullet trains and steam engines: exogenous attention zips but endogenous attention chugs along

    Chakravarthi, R., VanRullen, R.
    Journal of Vision, vol. 11, no. 4, pp. 1-12
    Contributions to Journals: Articles
    • [ONLINE] DOI:

  • The same binding in contour integration and crowding

    Chakravarthi, R., Pelli, D. G.
    Journal of Vision, vol. 11, no. 8, 10
    Contributions to Journals: Articles
    • [ONLINE] DOI:
    • [ONLINE]

  • Recovery of a crowded object by masking the flankers: determining the locus of feature integration

    Chakravarthi, R., Cavanagh, P.
    Journal of Vision, vol. 9, no. 10, 4
    Contributions to Journals: Articles
    • [ONLINE]
    • [ONLINE] DOI:

  • Bilateral field advantage in visual crowding

    Chakravarthi, R., Cavanagh, P.
    Vision Research, vol. 49, no. 13, pp. 1638-1646
    Contributions to Journals: Articles
    • [ONLINE] DOI:

  • Supercrowding: weakly masking a target expands the range of crowding

    Vickery, T., Shim, W. M., Chakravarthi, R., Jiang, Y., Luedeman, R.
    Journal of Vision, vol. 9, no. 2, pp. 1-15
    Contributions to Journals: Articles
    • [ONLINE]
    • [ONLINE] DOI:

  • Temporal properties of the polarity advantage effect in crowding

    Chakravarthi, R., Cavanagh, P.
    Journal of Vision, vol. 7, no. 2, 11
    Contributions to Journals: Articles
    • [ONLINE]
    • [ONLINE] DOI:

  • Real latencies and facilitation

    Chakravarthi, R.
    Consciousness and Cognition, vol. 11, no. 2, pp. 300-303
    Contributions to Journals: Articles
    • [ONLINE] DOI:

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