Joshua D. Koen

Unique Effects of Sedatives, Dissociatives, Psychedelics, Stimulants, and Cannabinoids on Episodic Memory: A Review and Reanalysis of Acute Drug Effects on Recollection, Familiarity, and Metamemory

This study reanalyzes episodic memory data from 10 datasets to show how different drug classes uniquely affect recollection, familiarity, and metamemory during encoding, consolidation, and retrieval.

Dissociative effects of age on neural differentiation at the category and item level

The paper examines age-related neural dedifferentiation at category and item levels using fMRI data, finding distinct patterns of decline and associations with memory performance.

Neural noise is associated with age-related neural dedifferentiation

This study examines the link between neural noise and age-related neural dedifferentiation using ERP components and finds age-related reductions in P200 amplitude and an age-invariant relationship between neural noise and N170 amplitude.

Age-related neural dedifferentiation for individual stimuli: An across-participant pattern similarity analysis

The paper introduces an across-participant pattern similarity analysis to measure neural distinctiveness for individual stimuli and finds age-related reductions in neural pattern distinctiveness during memory encoding.

The hippocampus shows an own-age bias during unfamiliar face viewing

The paper examines the neural correlates of the own-age bias in face recognition using repetition suppression, finding increased hippocampal activity for own-age faces during first viewing.

Transcranial magnetic stimulation of right dorsolateral prefrontal cortex does not affect associative retrieval in healthy young or older adults

This study investigates if TMS to the right DLPFC affects associative retrieval in young and older adults, finding no significant effect of TMS on recognition accuracy.

Medial prefrontal cortex has a causal role in selectively enhanced consolidation of emotional memories after a 24-hour delay: A TBS study

This study shows that stimulating the medial prefrontal cortex during memory encoding enhances emotional memory consolidation after a 24-hour delay but not immediately after encoding.

Effects of age on pre-stimulus neural activity predictive of successful memory encoding: an fMRI study

This study examines age-related differences in pre-stimulus neural activity predictive of memory encoding using fMRI, finding regionally specific patterns that suggest some cognitive processes are age-invariant.

Neural differentiation is moderated by age in scene- but not face-selective cortical regions

This study finds age-related neural dedifferentiation occurs in scene-selective but not face-selective cortical regions and is linked to better memory performance in older adults.

The relationship between age, neural differentiation, and memory performance

The paper examines the relationship between neural differentiation, age, and episodic memory performance, finding that reduced differentiation in the parahippocampal place area (PPA) correlates with memory performance independently of age.

Age-related differences in prestimulus subsequent memory effects assessed with event-related potentials

This study examines age-related differences in prestimulus subsequent memory effects using event-related potentials, finding distinct patterns in young and older adults.