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A conceptual artistic photo showing two open doorways in a dim, textured room, each emitting warm glowing light. A flock of bird silhouettes flies between them, transitioning from a dark dissolving mass on the left toward the illuminated openings. The imagery evokes choice and switching between two options, metaphorically representing pigeon preference and changeover behavior during concurrent VI VI reinforcement schedules.

When a stay is a switch: Discriminative control of response chunks determines preference during concurrent VI VI schedules

A photo showing a dim, cluttered teenager's bedroom viewed at dusk, with a large window revealing a burning, apocalyptic cityscape glowing orange through partially raised blinds and curtains. Inside are an unmade bed, a wooden chair, a glowing computer monitor on a messy desk, scattered cables, and photographs taped to the walls—visually evoking youth isolation, dystopian worldviews, and radicalization themes discussed in the article.

Shifts and continuity in contemporary violent extremism: Moving toward a dynamic and developmental understanding?

A conceptual illustration showing a lone figure in a green shirt walking along a crumbling stone path that disintegrates into scattered fragments and fiery orange chaos on the right. The left depicts a serene green landscape with a setting sun, rolling hills, and trees, symbolizing the fragmentation of ideological frameworks and the collapse of defined structures into disordered violent extremism.

The end of ideological violence

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A photo showing a dim, cluttered teenager's bedroom viewed at dusk, with a large window revealing a burning, apocalyptic cityscape glowing orange through partially raised blinds and curtains. Inside are an unmade bed, a wooden chair, a glowing computer monitor on a messy desk, scattered cables, and photographs taped to the walls—visually evoking youth isolation, dystopian worldviews, and radicalization themes discussed in the article.

Commentary

Shifts and continuity in contemporary violent extremism: Moving toward a dynamic and developmental understanding?

By Cécile Rousseau & Samuel Veissière

July 20, 2026

A conceptual illustration showing a lone figure in a green shirt walking along a crumbling stone path that disintegrates into scattered fragments and fiery orange chaos on the right. The left depicts a serene green landscape with a setting sun, rolling hills, and trees, symbolizing the fragmentation of ideological frameworks and the collapse of defined structures into disordered violent extremism.

Commentary

The end of ideological violence

By Clark McCauley

July 17, 2026

$A photo showing a fragmented, close-up human face in muted blue-gray tones, overlaid with distorted textures and streaks of vivid red. The image is heavily manipulated with cracked, glass-like fractures and double-exposure effects that obscure the eyes, evoking themes of psychological rupture, obscured identity, and violence—visually paralleling the article's discussion of ideology-free extremism fixated on aggression itself.$

Commentary

Extremism without ideology

By Quassim Cassam

July 9, 2026 (Cited by: 1)

A photo showing a close-up impasto oil painting of a human face composed of fragmented, palette-knife patches in blue, orange, yellow, red, and white. The mosaic-like brushstrokes assemble piercing blue eyes, nose, and mouth from disparate color blocks, visually evoking the article's "salad bar" metaphor of composite, hybrid extremist worldviews built from diverse ideological fragments.

Commentary

Why the ‘salad bar’ might actually help extremism research – A reply to Horgan and Shayler

By Stephane Baele

July 8, 2026 (Cited by: 1)

Commentary

The erosion of conceptual clarity in the study of political violence

By Arie Perliger

July 6, 2026 (Cited by: 2)

Acculturation and developmental psychology, a response to Berry (2025)

Commentary

Why longitudinal is not developmental: Clarifying misconceptions in acculturation research – A response to Berry (2025)

By Philipp Jugert & Peter F. Titzmann

December 9, 2025 (Cited by: 1)

Unpacking the integration puzzle: Overlooked insights from meta-analytical research. A Response to Berry (2025)

Commentary

Unpacking the integration puzzle: Overlooked insights from meta-analytical research. A response to Berry (2025)

By Kinga Bierwiaczonek

November 11, 2025

Commentary

Comments on the papers in the Special Issue “Acculturation reimagined: Setting the stage for the next era of inquiry”

By John W. Berry

September 3, 2025 (Cited by: 1)