Thomas Hagen

• Aminihajibashi, Samira; Hagen, Thomas; Foldal, Maja Dyhre; Laeng, Bruno & Espeseth, Thomas (2019). Individual differences in resting-state pupil size: Evidence for association between working memory capacity and pupil size variability. International Journal of Psychophysiology.  ISSN 0167-8760.  140, s 1- 7 . doi: 10.1016/j.ijpsycho.2019.03.007
• Mäki-Marttunen, Verónica; Hagen, Thomas & Espeseth, Thomas (2019). Proactive and reactive modes of cognitive control can operate independently and simultaneously. Acta Psychologica.  ISSN 0001-6918.  199, s 102891 . doi: 10.1016/j.actpsy.2019.102891
• Mäki-Marttunen, Verónica; Hagen, Thomas & Espeseth, Thomas (2019). Task context load induces reactive cognitive control: An fMRI study on cortical and brain stem activity. Cognitive, Affective, & Behavioral Neuroscience.  ISSN 1530-7026.  s 1- 21 . doi: 10.3758/s13415-019-00691-6 Show summary

  When solving dynamic visuo-spatial tasks, the brain copes with perceptual and cognitive processing challenges. In the multiple-object tracking (MOT) task, the number of objects to be tracked (i.e. load) imposes attentional demands, but so does spatial interference from irrelevant objects (i.e. crowding). Presently, it is not clear whether load and crowding activate separate cognitive and physiological mechanisms. Such knowledge would be important to understand the neurophysiology of visual attention. Furthermore, it would help resolve conflicting views between theories of visual cognition, particularly concerning sources of capacity limitations. To address this problem, we varied the degree of processing challenge in the MOT task in two ways: First, the number of objects to track, and second, the spatial proximity between targets and distractors. We first measured task-induced pupil dilations and saccades during MOT. In a separate cohort we measured fMRI brain activity during MOT. The behavioral results in both cohorts revealed that increased load and crowding led to reduced accuracy in an additive manner. Load was associated with pupil dilations, whereas crowding was not. Activity in dorsal attentional areas and frequency of saccades were proportionally larger both with higher levels of load and crowding. Higher crowding recruited additionally ventral attentional areas that may reflect orienting mechanisms. The activity in the brainstem nuclei ventral tegmental area/substantia nigra and locus coeruleus showed clearly dissociated patterns. Our results constitute convergent evidence from independent samples that processing challenges due to load and object spacing may rely on different mechanisms.

• Mäki-Marttunen, Verónica; Hagen, Thomas; Laeng, Bruno & Espeseth, Thomas (2019). Distinct Neural Mechanisms Meet Challenges in Dynamic Visual Attention due to Either Load or Object Spacing. Journal of Cognitive Neuroscience.  ISSN 0898-929X.  32(1), s 65- 84 . doi: 10.1162/jocn_a_01469
• Laeng, Bruno; Kiambarua, Kenneth Gitiye; Hagen, Thomas; Bochynska, Agata; Lubell, James; Suzuki, Hikaru & Okubo, Matia (2018). The "face race lightness illusion": An effect of the eyes and pupils?. PLOS ONE.  ISSN 1932-6203.  13:e0201603(8), s 1- 36 . doi: 10.1371/journal.pone.0201603 Full text in Research Archive.
• Hagen, Thomas & Laeng, Bruno (2017). Animals Do Not Induce or Reduce Attentional Blinking, But They Are Reported More Accurately in a Rapid Serial Visual Presentation Task. i-Perception.  ISSN 2041-6695.  8(5), s 1- 25 . doi: 10.1177/2041669517735542 Full text in Research Archive.
• Hagen, Thomas & Laeng, Bruno (2016). The Change Detection Advantage for Animals: An Effect of Ancestral Priorities or Progeny of Experimental Design?. i-Perception.  ISSN 2041-6695.  7(3), s 1- 17 . doi: 10.1177/2041669516651366 Full text in Research Archive.

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• Stavrinou, Maria; Asko, Olgerta; Hagen, Thomas; Foldal, Maja Dyhre & Espeseth, Thomas (2017). The long term effects of reward on spatial priority maps studied with Electroencephalography and Pupillometry.

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